machine: add tool to check consistency with documentation

This tool checks whether the machine package matches the documentation in https://tinygo.org/docs/reference/machine/.
2026-07-26 14:48:40 +00:00 · 2022-09-26 16:50:14 +02:00
1333 changed files with 19833 additions and 70524 deletions
@@ -6,16 +6,28 @@ commands:
      - run:
          name: "Pull submodules"
          command: git submodule update --init
+  install-xtensa-toolchain:
+    parameters:
+      variant:
+        type: string
+    steps:
+      - run:
+          name: "Install Xtensa toolchain"
+          command: |
+            curl -L https://github.com/espressif/crosstool-NG/releases/download/esp-2020r2/xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz -o xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
+            sudo tar -C /usr/local -xf xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
+            sudo ln -s /usr/local/xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/xtensa-esp32-elf-ld
+            rm xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
  llvm-source-linux:
    steps:
      - restore_cache:
          keys:
-            - llvm-source-19-v1
+            - llvm-source-14-v3
      - run:
          name: "Fetch LLVM source"
          command: make llvm-source
      - save_cache:
-          key: llvm-source-19-v1
+          key: llvm-source-14-v3
          paths:
            - llvm-project/clang/lib/Headers
            - llvm-project/clang/include
@@ -33,13 +45,13 @@ commands:
    steps:
      - restore_cache:
          keys:
-            - binaryen-linux-v3
+            - binaryen-linux-v2
      - run:
          name: "Build Binaryen"
          command: |
            make binaryen
      - save_cache:
-          key: binaryen-linux-v3
+          key: binaryen-linux-v2
          paths:
            - build/wasm-opt
  test-linux:
@@ -55,7 +67,7 @@ commands:
      - run:
          name: "Install apt dependencies"
          command: |
-            echo 'deb https://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-<<parameters.llvm>> main' > /etc/apt/sources.list.d/llvm.list
+            echo 'deb https://apt.llvm.org/buster/ llvm-toolchain-buster-<<parameters.llvm>> main' > /etc/apt/sources.list.d/llvm.list
            wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
            apt-get update
            apt-get install --no-install-recommends -y \
@@ -63,16 +75,26 @@ commands:
                clang-<<parameters.llvm>> \
                libclang-<<parameters.llvm>>-dev \
                lld-<<parameters.llvm>> \
+                gcc-avr \
+                avr-libc \
                cmake \
                ninja-build
      - hack-ninja-jobs
      - build-binaryen-linux
      - restore_cache:
          keys:
-            - go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
-            - go-cache-v4-{{ checksum "go.mod" }}
+            - go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
+            - go-cache-v3-{{ checksum "go.mod" }}
      - llvm-source-linux
      - run: go install -tags=llvm<<parameters.llvm>> .
+      - restore_cache:
+          keys:
+            - wasi-libc-sysroot-systemclang-v6
+      - run: make wasi-libc
+      - save_cache:
+          key: wasi-libc-sysroot-systemclang-v6
+          paths:
+            - lib/wasi-libc/sysroot
      - when:
          condition: <<parameters.fmt-check>>
          steps:
@@ -80,33 +102,22 @@ commands:
              # Do this before gen-device so that it doesn't check the
              # formatting of generated files.
              name: Check Go code formatting
-              command: make fmt-check lint
+              command: make fmt-check
      - run: make gen-device -j4
-      # TODO: change this to -skip='TestErrors|TestWasm' with Go 1.20
-      - run: go test -tags=llvm<<parameters.llvm>> -short -run='TestBuild|TestTest|TestGetList|TestTraceback'
      - run: make smoketest XTENSA=0
      - save_cache:
-          key: go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
+          key: go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
            - /go/pkg/mod

 jobs:
-  test-llvm15-go119:
+  test-llvm14-go118:
    docker:
-      - image: golang:1.19-bullseye
+      - image: golang:1.18-buster
    steps:
      - test-linux:
-          llvm: "15"
-          # "make lint" fails before go 1.21 because internal/tools/go.mod specifies packages that require go 1.21
-          fmt-check: false
-    resource_class: large
-  test-llvm19-go124:
-    docker:
-      - image: golang:1.24-bullseye
-    steps:
-      - test-linux:
-          llvm: "19"
+          llvm: "14"
    resource_class: large

 workflows:
@@ -114,6 +125,4 @@ workflows:
    jobs:
      # This tests our lowest supported versions of Go and LLVM, to make sure at
      # least the smoke tests still pass.
-      - test-llvm15-go119
-      # This tests LLVM 19 support when linking against system libraries.
-      - test-llvm19-go124
+      - test-llvm14-go118
@@ -1,5 +1,3 @@
 build/
 llvm-*/
-.github
-.circleci

@@ -1,3 +0,0 @@
-# These are supported funding model platforms
-
-open_collective: tinygo
@@ -14,38 +14,33 @@ concurrency:
 jobs:
  build-macos:
    name: build-macos
-    strategy:
-      matrix:
-        # macos-13: amd64 (oldest supported version as of 18-10-2024)
-        # macos-14: arm64 (oldest arm64 version)
-        os: [macos-13, macos-14]
-        include:
-          - os: macos-13
-            goarch: amd64
-          - os: macos-14
-            goarch: arm64
-    runs-on: ${{ matrix.os }}
+    runs-on: macos-11
    steps:
      - name: Install Dependencies
+        shell: bash
        run: |
          HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
+      - name: Install Xtensa toolchain
+        shell: bash
+        run: |
+          curl -L https://github.com/espressif/crosstool-NG/releases/download/esp-2020r2/xtensa-esp32-elf-gcc8_2_0-esp-2020r2-macos.tar.gz -o xtensa-esp32-elf-gcc8_2_0-esp-2020r2-macos.tar.gz
+          sudo tar -C /usr/local -xf xtensa-esp32-elf-gcc8_2_0-esp-2020r2-macos.tar.gz
+          sudo ln -s /usr/local/xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/xtensa-esp32-elf-ld
+          rm xtensa-esp32-elf-gcc8_2_0-esp-2020r2-macos.tar.gz
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
        with:
          submodules: true
-      - name: Extract TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM source
+        uses: actions/cache@v3
        id: cache-llvm-source
        with:
-          key: llvm-source-19-${{ matrix.os }}-v1
+          key: llvm-source-14-macos-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -55,25 +50,15 @@ jobs:
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM build
+        uses: actions/cache@v3
        id: cache-llvm-build
        with:
-          key: llvm-build-19-${{ matrix.os }}-v1
+          key: llvm-build-14-macos-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+        shell: bash
        run: |
          # fetch LLVM source
          rm -rf llvm-project
@@ -83,22 +68,25 @@ jobs:
          # build!
          make llvm-build
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+      - name: Cache wasi-libc sysroot
+        uses: actions/cache@v3
+        id: cache-wasi-libc
        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
-      - name: make gen-device
-        run: make -j3 gen-device
+          key: wasi-libc-sysroot-v4
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
      - name: Test TinyGo
-        run: make test GOTESTFLAGS="-short"
+        shell: bash
+        run: make test GOTESTFLAGS="-v -short"
      - name: Build TinyGo release tarball
        run: make release -j3
      - name: Test stdlib packages
        run: make tinygo-test
      - name: Make release artifact
-        run: cp -p build/release.tar.gz build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
+        shell: bash
+        run: cp -p build/release.tar.gz build/tinygo.darwin-amd64.tar.gz 
      - name: Publish release artifact
        # Note: this release artifact is double-zipped, see:
        # https://github.com/actions/upload-artifact/issues/39
@@ -106,43 +94,29 @@ jobs:
        # - have a double-zipped artifact when downloaded from the UI
        # - have a very slow artifact upload
        # We're doing the former here, to keep artifact uploads fast.
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v2
        with:
-          name: darwin-${{ matrix.goarch }}-double-zipped-${{ steps.version.outputs.version }}
-          path: build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
+          name: release-double-zipped
+          path: build/tinygo.darwin-amd64.tar.gz
      - name: Smoke tests
-        run: make smoketest TINYGO=$(PWD)/build/tinygo
+        shell: bash
+        run: make smoketest TINYGO=$(PWD)/build/tinygo AVR=0
  test-macos-homebrew:
    name: homebrew-install
    runs-on: macos-latest
-    strategy:
-      matrix:
-        version: [16, 17, 18, 19]
    steps:
-      - name: Set up Homebrew
-        uses: Homebrew/actions/setup-homebrew@master
-      - name: Fix Python symlinks
-        run: |
-          # Github runners have broken symlinks, so relink
-          # see: https://github.com/actions/setup-python/issues/577
-          brew list -1 | grep python | while read formula; do brew unlink $formula; brew link --overwrite $formula; done
      - name: Install LLVM
+        shell: bash
        run: |
-          brew install llvm@${{ matrix.version }}
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install llvm@14
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
-      - name: Build TinyGo (LLVM ${{ matrix.version }})
-        run: go install -tags=llvm${{ matrix.version }}
-      - name: Check binary
-        run: tinygo version
-      - name: Build TinyGo (default LLVM)
-        if: matrix.version == 19
+      - name: Build TinyGo
        run: go install
      - name: Check binary
-        if: matrix.version == 19
        run: tinygo version
@@ -19,46 +19,35 @@ jobs:
      packages: write
      contents: read
    steps:
-      - name: Free Disk space
-        shell: bash
-        run: |
-          df -h
-          sudo rm -rf /opt/hostedtoolcache
-          sudo rm -rf /usr/local/lib/android
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf /usr/local/graalvm
-          sudo rm -rf /usr/local/share/boost
-          df -h
      - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
        with:
          submodules: recursive
      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v1
      - name: Docker meta
        id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v3
        with:
          images: |
            tinygo/tinygo-dev
-            ghcr.io/${{ github.repository_owner }}/tinygo-dev
+            ghcr.io/${{ github.repository }}/tinygo-dev
          tags: |
            type=sha,format=long
            type=raw,value=latest
      - name: Log in to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Log in to Github Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
@@ -80,31 +69,21 @@ jobs:
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/tinygo-org/bluetooth/actions/workflows/linux.yml/dispatches \
          -d '{"ref": "dev"}'
-      - name: Trigger TinyFS repo build on Github Actions
+      - name: Trigger TinyFS repo build on CircleCI
        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyfs/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyFont repo build on Github Actions
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinyfs/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"
+      - name: Trigger TinyFont repo build on CircleCI
        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyfont/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyDraw repo build on Github Actions
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinyfont/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"
+      - name: Trigger TinyDraw repo build on CircleCI
        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinydraw/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
-      - name: Trigger TinyTerm repo build on Github Actions
-        run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/tinygo-org/tinyterm/actions/workflows/build.yml/dispatches \
-          -d '{"ref": "dev"}'
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinydraw/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"
@@ -18,37 +18,32 @@ jobs:
    # statically linked binary.
    runs-on: ubuntu-latest
    container:
-      image: golang:1.24-alpine
-    outputs:
-      version: ${{ steps.version.outputs.version }}
+      image: golang:1.19-alpine
    steps:
      - name: Install apk dependencies
-        # tar: needed for actions/cache@v4
+        # tar: needed for actions/cache@v3
        # git+openssh: needed for checkout (I think?)
        # ruby: needed to install fpm
-        run: apk add tar git openssh make g++ ruby-dev
+        run: apk add tar git openssh make g++ ruby
      - name: Work around CVE-2022-24765
        # We're not on a multi-user machine, so this is safe.
        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
        with:
          submodules: true
-      - name: Extract TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Cache Go
-        uses: actions/cache@v4
+        uses: actions/cache@v3
        with:
          key: go-cache-linux-alpine-v1-${{ hashFiles('go.mod') }}
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM source
+        uses: actions/cache@v3
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-alpine-v1
+          key: llvm-source-14-linux-alpine-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -58,22 +53,11 @@ jobs:
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM build
+        uses: actions/cache@v3
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-alpine-v1
+          key: llvm-build-14-linux-alpine-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -87,14 +71,8 @@ jobs:
          make llvm-build
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v3
        id: cache-binaryen
        with:
          key: binaryen-linux-alpine-v1
@@ -104,59 +82,69 @@ jobs:
        run: |
          apk add cmake samurai python3
          make binaryen STATIC=1
+      - name: Cache wasi-libc
+        uses: actions/cache@v3
+        id: cache-wasi-libc
+        with:
+          key: wasi-libc-sysroot-linux-alpine-v1
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
      - name: Install fpm
        run: |
          gem install --version 4.0.7 public_suffix
          gem install --version 2.7.6 dotenv
          gem install --no-document fpm
-      - name: Run linter
-        run: make lint
-      - name: Run spellcheck
-        run: make spell
      - name: Build TinyGo release
        run: |
          make release deb -j3 STATIC=1
-          cp -p build/release.tar.gz /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
+          cp -p build/release.tar.gz /tmp/tinygo.linux-amd64.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_amd64.deb
      - name: Publish release artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v2
        with:
-          name: linux-amd64-double-zipped-${{ steps.version.outputs.version }}
+          name: linux-amd64-double-zipped
          path: |
-            /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-            /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
+            /tmp/tinygo.linux-amd64.tar.gz
+            /tmp/tinygo_amd64.deb
  test-linux-build:
    # Test the binaries built in the build-linux job by running the smoke tests.
    runs-on: ubuntu-latest
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          submodules: true
+        uses: actions/checkout@v2
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
      - name: Install wasmtime
-        uses: bytecodealliance/actions/wasmtime/setup@v1
-        with:
-          version: "29.0.1"
-      - name: Install wasm-tools
-        uses: bytecodealliance/actions/wasm-tools/setup@v1
+        run: |
+          curl https://wasmtime.dev/install.sh -sSf | bash
+          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
      - name: Download release artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v2
        with:
-          name: linux-amd64-double-zipped-${{ needs.build-linux.outputs.version }}
+          name: linux-amd64-double-zipped
      - name: Extract release tarball
        run: |
          mkdir -p ~/lib
-          tar -C ~/lib -xf tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
+          tar -C ~/lib -xf tinygo.linux-amd64.tar.gz
          ln -s ~/lib/tinygo/bin/tinygo ~/go/bin/tinygo
-      - run: make tinygo-test-wasip1-fast
-      - run: make tinygo-test-wasip2-fast
-      - run: make tinygo-test-wasm
+      - name: Install apt dependencies
+        run: |
+          sudo apt-get install --no-install-recommends \
+              gcc-avr \
+              avr-libc
+      - name: "Install Xtensa toolchain"
+        run: |
+          curl -L https://github.com/espressif/crosstool-NG/releases/download/esp-2020r2/xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz -o xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
+          sudo tar -C /usr/local -xf xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
+          sudo ln -s /usr/local/xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/xtensa-esp32-elf-ld
+          rm xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
+      - run: make tinygo-test-wasi-fast
      - run: make smoketest
  assert-test-linux:
    # Run all tests that can run on Linux, with LLVM assertions enabled to catch
@@ -164,7 +152,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
        with:
          submodules: true
      - name: Install apt dependencies
@@ -176,28 +164,28 @@ jobs:
              qemu-system-arm \
              qemu-system-riscv32 \
              qemu-user \
+              gcc-avr \
+              avr-libc \
              simavr \
              ninja-build
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
      - name: Install Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v2
        with:
-          node-version: '18'
+          node-version: '14'
      - name: Install wasmtime
-        uses: bytecodealliance/actions/wasmtime/setup@v1
-        with:
-          version: "29.0.1"
-      - name: Setup `wasm-tools`
-        uses: bytecodealliance/actions/wasm-tools/setup@v1
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+        run: |
+          curl https://wasmtime.dev/install.sh -sSf | bash
+          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
+      - name: Cache LLVM source
+        uses: actions/cache@v3
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-asserts-v1
+          key: llvm-source-14-linux-asserts-v2
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -207,22 +195,11 @@ jobs:
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM build
+        uses: actions/cache@v3
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-asserts-v1
+          key: llvm-build-14-linux-asserts-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -234,14 +211,8 @@ jobs:
          make llvm-build ASSERT=1
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v3
        id: cache-binaryen
        with:
          key: binaryen-linux-asserts-v1
@@ -249,6 +220,15 @@ jobs:
      - name: Build Binaryen
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
        run: make binaryen
+      - name: Cache wasi-libc
+        uses: actions/cache@v3
+        id: cache-wasi-libc
+        with:
+          key: wasi-libc-sysroot-linux-asserts-v5
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
      - run: make gen-device -j4
      - name: Test TinyGo
        run: make ASSERT=1 test
@@ -256,12 +236,20 @@ jobs:
        run: |
          make ASSERT=1
          echo "$(pwd)/build" >> $GITHUB_PATH
+      - name: Test machine package
+        run: make check-machine
      - name: Test stdlib packages
        run: make tinygo-test
+      - name: Install Xtensa toolchain
+        run: |
+          curl -L https://github.com/espressif/crosstool-NG/releases/download/esp-2020r2/xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz -o xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
+          sudo tar -C /usr/local -xf xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
+          sudo ln -s /usr/local/xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/xtensa-esp32-elf-ld
+          rm xtensa-esp32-elf-gcc8_2_0-esp-2020r2-linux-amd64.tar.gz
      - run: make smoketest
      - run: make wasmtest
-      - run: make tinygo-test-baremetal
-  build-linux-cross:
+      - run: make tinygo-baremetal
+  build-linux-arm:
    # Build ARM Linux binaries, ready for release.
    # This intentionally uses an older Linux image, so that we compile against
    # an older glibc version and therefore are compatible with a wide range of
@@ -270,41 +258,28 @@ jobs:
    # in that process to avoid doing lots of duplicate work and to avoid
    # complications around precompiled libraries such as compiler-rt shipped as
    # part of the release tarball.
-    strategy:
-      matrix:
-        goarch: [ arm, arm64 ]
-        include:
-          - goarch: arm64
-            toolchain: aarch64-linux-gnu
-            libc: arm64
-          - goarch: arm
-            toolchain: arm-linux-gnueabihf
-            libc: armhf
-    runs-on: ubuntu-22.04 # note: use the oldest image available! (see above)
+    runs-on: ubuntu-18.04
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Get TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
+        uses: actions/checkout@v2
      - name: Install apt dependencies
        run: |
          sudo apt-get update
          sudo apt-get install --no-install-recommends \
              qemu-user \
-              g++-${{ matrix.toolchain }} \
-              libc6-dev-${{ matrix.libc }}-cross
+              g++-arm-linux-gnueabihf \
+              libc6-dev-armhf-cross
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM source
+        uses: actions/cache@v3
        id: cache-llvm-source
        with:
-          key: llvm-source-19-linux-v1
+          key: llvm-source-14-linux-v2
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -314,22 +289,11 @@ jobs:
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM build
+        uses: actions/cache@v3
        id: cache-llvm-build
        with:
-          key: llvm-build-19-linux-${{ matrix.goarch }}-v3
+          key: llvm-build-14-linux-arm-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -340,27 +304,21 @@ jobs:
          # Install build dependencies.
          sudo apt-get install --no-install-recommends ninja-build
          # build!
-          make llvm-build CROSS=${{ matrix.toolchain }}
+          make llvm-build CROSS=arm-linux-gnueabihf
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v4
+        uses: actions/cache@v3
        id: cache-binaryen
        with:
-          key: binaryen-linux-${{ matrix.goarch }}-v4
+          key: binaryen-linux-arm-v1
          path: build/wasm-opt
      - name: Build Binaryen
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
        run: |
          sudo apt-get install --no-install-recommends ninja-build
          git submodule update --init lib/binaryen
-          make CROSS=${{ matrix.toolchain }} binaryen
+          make CROSS=arm-linux-gnueabihf binaryen
      - name: Install fpm
        run: |
          sudo gem install --version 4.0.7 public_suffix
@@ -368,28 +326,125 @@ jobs:
          sudo gem install --no-document fpm
      - name: Build TinyGo binary
        run: |
-          make CROSS=${{ matrix.toolchain }}
+          make CROSS=arm-linux-gnueabihf
      - name: Download amd64 release
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v2
        with:
-          name: linux-amd64-double-zipped-${{ needs.build-linux.outputs.version }}
+          name: linux-amd64-double-zipped
      - name: Extract amd64 release
        run: |
          mkdir -p build/release
-          tar -xf tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz -C build/release tinygo
+          tar -xf tinygo.linux-amd64.tar.gz -C build/release tinygo
      - name: Modify release
        run: |
          cp -p build/tinygo   build/release/tinygo/bin
          cp -p build/wasm-opt build/release/tinygo/bin
-      - name: Create ${{ matrix.goarch }} release
+      - name: Create arm release
        run: |
-          make release deb RELEASEONLY=1 DEB_ARCH=${{ matrix.libc }}
-          cp -p build/release.tar.gz /tmp/tinygo${{ steps.version.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_${{ steps.version.outputs.version }}_${{ matrix.libc }}.deb
+          make release deb RELEASEONLY=1 DEB_ARCH=armhf
+          cp -p build/release.tar.gz /tmp/tinygo.linux-arm.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_armhf.deb
      - name: Publish release artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v2
        with:
-          name: linux-${{ matrix.goarch }}-double-zipped-${{ steps.version.outputs.version }}
+          name: linux-arm-double-zipped
          path: |
-            /tmp/tinygo${{ steps.version.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-            /tmp/tinygo_${{ steps.version.outputs.version }}_${{ matrix.libc }}.deb
+            /tmp/tinygo.linux-arm.tar.gz
+            /tmp/tinygo_armhf.deb
+  build-linux-arm64:
+    # Build ARM64 Linux binaries, ready for release.
+    # It is set to "needs: build-linux" because it modifies the release created
+    # in that process to avoid doing lots of duplicate work and to avoid
+    # complications around precompiled libraries such as compiler-rt shipped as
+    # part of the release tarball.
+    runs-on: ubuntu-18.04
+    needs: build-linux
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install apt dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends \
+              qemu-user \
+              g++-aarch64-linux-gnu \
+              libc6-dev-arm64-cross \
+              ninja-build
+      - name: Install Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: '1.19'
+          cache: true
+      - name: Cache LLVM source
+        uses: actions/cache@v3
+        id: cache-llvm-source
+        with:
+          key: llvm-source-14-linux-v1
+          path: |
+            llvm-project/clang/lib/Headers
+            llvm-project/clang/include
+            llvm-project/compiler-rt
+            llvm-project/lld/include
+            llvm-project/llvm/include
+      - name: Download LLVM source
+        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
+        run: make llvm-source
+      - name: Cache LLVM build
+        uses: actions/cache@v3
+        id: cache-llvm-build
+        with:
+          key: llvm-build-14-linux-arm64-v1
+          path: llvm-build
+      - name: Build LLVM
+        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+        run: |
+          # fetch LLVM source
+          rm -rf llvm-project
+          make llvm-source
+          # build!
+          make llvm-build CROSS=aarch64-linux-gnu
+          # Remove unnecessary object files (to reduce cache size).
+          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
+      - name: Cache Binaryen
+        uses: actions/cache@v3
+        id: cache-binaryen
+        with:
+          key: binaryen-linux-arm64-v1
+          path: build/wasm-opt
+      - name: Build Binaryen
+        if: steps.cache-binaryen.outputs.cache-hit != 'true'
+        run: |
+          git submodule update --init lib/binaryen
+          make CROSS=aarch64-linux-gnu binaryen
+      - name: Install fpm
+        run: |
+          sudo gem install --version 4.0.7 public_suffix
+          sudo gem install --version 2.7.6 dotenv
+          sudo gem install --no-document fpm
+      - name: Build TinyGo binary
+        run: |
+          make CROSS=aarch64-linux-gnu
+      - name: Download amd64 release
+        uses: actions/download-artifact@v2
+        with:
+          name: linux-amd64-double-zipped
+      - name: Extract amd64 release
+        run: |
+          mkdir -p build/release
+          tar -xf tinygo.linux-amd64.tar.gz -C build/release tinygo
+      - name: Modify release
+        run: |
+          cp -p build/tinygo   build/release/tinygo/bin
+          cp -p build/wasm-opt build/release/tinygo/bin
+      - name: Create arm64 release
+        run: |
+          make release deb RELEASEONLY=1 DEB_ARCH=arm64
+          cp -p build/release.tar.gz /tmp/tinygo.linux-arm64.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_arm64.deb
+      - name: Publish release artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: linux-arm64-double-zipped
+          path: |
+            /tmp/tinygo.linux-arm64.tar.gz
+            /tmp/tinygo_arm64.deb
@@ -1,63 +0,0 @@
-# This is the Github action to build and push the LLVM Docker image
-# used by the tinygo/tinygo-dev Docker image.
-#
-# It only needs to be rebuilt when updating the LLVM version.
-#
-# To update, make any needed changes to this file,
-# then push to the "build-llvm-image" branch.
-#
-# The needed image will be rebuilt, which will very likely take at least 1-2 hours.
-name: LLVM
-on:
-  push:
-    branches: [ build-llvm-image ]
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build-push-llvm:
-    name: build-push-llvm
-    runs-on: ubuntu-latest
-    permissions:
-      packages: write
-      contents: read
-    steps:
-      - name: Check out the repo
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: |
-            tinygo/llvm-19
-            ghcr.io/${{ github.repository_owner }}/llvm-19
-          tags: |
-            type=sha,format=long
-            type=raw,value=latest
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-      - name: Log in to Github Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
-        uses: docker/build-push-action@v5
-        with:
-          target: tinygo-llvm-build
-          context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
@@ -1,48 +0,0 @@
-name: Nix
-
-on:
-  pull_request:
-  push:
-    branches:
-      - dev
-      - release
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  nix-test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Uninstall system LLVM
-        # Hack to work around issue where we still include system headers for
-        # some reason.
-        # See: https://github.com/tinygo-org/tinygo/pull/4516#issuecomment-2416363668
-        run: sudo apt-get remove llvm-18
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Pull musl, bdwgc
-        run: |
-            git submodule update --init lib/musl lib/bdwgc
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v4
-        id: cache-llvm-source
-        with:
-          key: llvm-source-19-linux-nix-v1
-          path: |
-            llvm-project/compiler-rt
-      - name: Download LLVM source
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/compiler-rt
-      - uses: cachix/install-nix-action@v22
-      - name: Test
-        run: |
-          nix develop --ignore-environment --keep HOME --command bash -c "go install && ~/go/bin/tinygo version && ~/go/bin/tinygo build -o test ./testdata/cgo"
@@ -1,12 +0,0 @@
-# Command that's part of sizediff.yml. This is put in a separate file so that it
-# still works after checking out the dev branch (that is, when going from LLVM
-# 16 to LLVM 17 for example, both Clang 16 and Clang 17 are installed).
-
-echo 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-19 main' | sudo tee /etc/apt/sources.list.d/llvm.list
-wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-sudo apt-get update
-sudo apt-get install --no-install-recommends -y \
-    llvm-19-dev \
-    clang-19 \
-    libclang-19-dev \
-    lld-19
@@ -1,93 +0,0 @@
-name: Binary size difference
-
-on:
-  pull_request:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  sizediff:
-    # Note: when updating the Ubuntu version, also update the Ubuntu version in
-    # sizediff-install-pkgs.sh
-    runs-on: ubuntu-24.04
-    permissions:
-      pull-requests: write
-    steps:
-      # Prepare, install tools
-      - name: Add GOBIN to $PATH
-        run: |
-          echo "$HOME/go/bin" >> $GITHUB_PATH
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0 # fetch all history (no sparse checkout)
-          submodules: true
-      - name: Install apt dependencies
-        run: ./.github/workflows/sizediff-install-pkgs.sh
-      - name: Restore LLVM source cache
-        uses: actions/cache@v4
-        id: cache-llvm-source
-        with:
-          key: llvm-source-19-sizediff-v1
-          path: |
-            llvm-project/compiler-rt
-      - name: Download LLVM source
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        run: make llvm-source
-      - name: Cache Go
-        uses: actions/cache@v4
-        with:
-          key: go-cache-linux-sizediff-v2-${{ hashFiles('go.mod') }}
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-      - run: make gen-device -j4
-      - name: Download drivers repo
-        run: git clone https://github.com/tinygo-org/drivers.git
-      - name: Save HEAD
-        run: git branch github-actions-saved-HEAD HEAD
-
-      # Compute sizes for the PR branch
-      - name: Build tinygo binary for the PR branch
-        run: go install
-      - name: Determine binary sizes on the PR branch
-        run: (cd drivers; make smoke-test XTENSA=0 | tee sizes-pr.txt)
-
-      # Compute sizes for the dev branch
-      - name: Checkout dev branch
-        run: |
-          git reset --hard origin/dev
-          git checkout --no-recurse-submodules `git merge-base HEAD origin/dev`
-      - name: Install apt dependencies on the dev branch
-        # this is only needed on a PR that changes the LLVM version
-        run: ./.github/workflows/sizediff-install-pkgs.sh
-      - name: Build tinygo binary for the dev branch
-        run: go install
-      - name: Determine binary sizes on the dev branch
-        run: (cd drivers; make smoke-test XTENSA=0 | tee sizes-dev.txt)
-
-      # Create comment
-      # TODO: add a summary, something like:
-      #  - overall size difference (percent)
-      #  - number of binaries that grew / shrank / remained the same
-      #  - don't show the full diff when no binaries changed
-      - name: Calculate size diff
-        run: ./tools/sizediff drivers/sizes-dev.txt drivers/sizes-pr.txt | tee sizediff.txt
-      - name: Create comment
-        run: |
-          echo "Size difference with the dev branch:" > comment.txt
-          echo "<details><summary>Binary size difference</summary>" >> comment.txt
-          echo "<pre>" >> comment.txt
-          cat sizediff.txt >> comment.txt
-          echo "</pre></details>" >> comment.txt
-      - name: Comment contents
-        run: cat comment.txt
-      - name: Add comment
-        if: ${{ github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name }}
-        uses: thollander/actions-comment-pull-request@v2.3.1
-        with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          filePath: comment.txt
-          comment_tag: sizediff
@@ -1,4 +0,0 @@
-#!/bin/sh
-
-# Extract the version string from the source code, to be stored in a variable.
-grep 'const version' goenv/version.go | sed 's/^const version = "\(.*\)"$/version=\1/g'
@@ -14,15 +14,7 @@ concurrency:
 jobs:
  build-windows:
    runs-on: windows-2022
-    outputs:
-      version: ${{ steps.version.outputs.version }}
    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
      - uses: brechtm/setup-scoop@v2
        with:
          scoop_update: 'false'
@@ -31,23 +23,19 @@ jobs:
        run: |
          scoop install ninja binaryen
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
        with:
          submodules: true
-      - name: Extract TinyGo version
-        id: version
-        shell: bash
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
      - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.24'
+          go-version: '1.19'
          cache: true
-      - name: Restore cached LLVM source
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM source
+        uses: actions/cache@v3
        id: cache-llvm-source
        with:
-          key: llvm-source-19-windows-v1
+          key: llvm-source-14-windows-v2
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -57,22 +45,11 @@ jobs:
      - name: Download LLVM source
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
-      - name: Save cached LLVM source
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore cached LLVM build
-        uses: actions/cache/restore@v4
+      - name: Cache LLVM build
+        uses: actions/cache@v3
        id: cache-llvm-build
        with:
-          key: llvm-build-19-windows-v1
+          key: llvm-build-14-windows-v2
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -85,34 +62,28 @@ jobs:
          make llvm-build CCACHE=OFF
          # Remove unnecessary object files (to reduce cache size).
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save cached LLVM build
-        uses: actions/cache/save@v4
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+      - name: Cache wasi-libc sysroot
+        uses: actions/cache@v3
+        id: cache-wasi-libc
        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
-      - name: Cache Go cache
-        uses: actions/cache@v4
-        with:
-          key: go-cache-windows-v1-${{ hashFiles('go.mod') }}
-          path: |
-            C:/Users/runneradmin/AppData/Local/go-build
-            C:/Users/runneradmin/go/pkg/mod
+          key: wasi-libc-sysroot-v4
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
      - name: Install wasmtime
        run: |
-          scoop install wasmtime@29.0.1
-      - name: make gen-device
-        run: make -j3 gen-device
+          scoop install wasmtime
      - name: Test TinyGo
        shell: bash
-        run: make test GOTESTFLAGS="-short"
+        run: make test GOTESTFLAGS="-v -short"
      - name: Build TinyGo release tarball
        shell: bash
        run: make build/release -j4
      - name: Make release artifact
        shell: bash
        working-directory: build/release
-        run: 7z -tzip a tinygo${{ steps.version.outputs.version }}.windows-amd64.zip tinygo
+        run: 7z -tzip a release.zip tinygo
      - name: Publish release artifact
        # Note: this release artifact is double-zipped, see:
        # https://github.com/actions/upload-artifact/issues/39
@@ -120,109 +91,14 @@ jobs:
        # - have a dobule-zipped artifact when downloaded from the UI
        # - have a very slow artifact upload
        # We're doing the former here, to keep artifact uploads fast.
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v2
        with:
-          name: windows-amd64-double-zipped-${{ steps.version.outputs.version }}
-          path: build/release/tinygo${{ steps.version.outputs.version }}.windows-amd64.zip
-
-  smoke-test-windows:
-    runs-on: windows-2022
-    needs: build-windows
-    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
-      - name: Install Dependencies
-        shell: bash
-        run: |
-          scoop install binaryen
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: '1.24'
-          cache: true
-      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
-        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
-          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
+          name: release-double-zipped
+          path: build/release/release.zip
      - name: Smoke tests
        shell: bash
-        run: make smoketest TINYGO=$(PWD)/build/tinygo/bin/tinygo
-
-  stdlib-test-windows:
-    runs-on: windows-2022
-    needs: build-windows
-    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: '1.24'
-          cache: true
-      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
-        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
-          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
+        run: make smoketest TINYGO=$(PWD)/build/tinygo AVR=0 XTENSA=0
      - name: Test stdlib packages
-        run: make tinygo-test TINYGO=$(PWD)/build/tinygo/bin/tinygo
-
-  stdlib-wasi-test-windows:
-    runs-on: windows-2022
-    needs: build-windows
-    steps:
-      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.4
-        with:
-          minimum-size: 8GB
-          maximum-size: 24GB
-          disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
-      - name: Install Dependencies
-        shell: bash
-        run: |
-          scoop install binaryen && scoop install wasmtime@29.0.1
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: '1.24'
-          cache: true
-      - name: Download TinyGo build
-        uses: actions/download-artifact@v4
-        with:
-          name: windows-amd64-double-zipped-${{ needs.build-windows.outputs.version }}
-          path: build/
-      - name: Unzip TinyGo build
-        shell: bash
-        working-directory: build
-        run: 7z x tinygo*.windows-amd64.zip -r
-      - name: Test stdlib packages on wasip1
-        run: make tinygo-test-wasip1-fast TINYGO=$(PWD)/build/tinygo/bin/tinygo
+        run: make tinygo-test
+      - name: Test stdlib packages on wasi
+        run: make tinygo-test-wasi-fast
@@ -1,8 +1,3 @@
-.DS_Store
-.vscode
-go.work
-go.work.sum
-
 docs/_build
 src/device/avr/*.go
 src/device/avr/*.ld
@@ -20,11 +15,9 @@ src/device/stm32/*.go
 src/device/stm32/*.s
 src/device/kendryte/*.go
 src/device/kendryte/*.s
-src/device/renesas/*.go
-src/device/renesas/*.s
 src/device/rp/*.go
 src/device/rp/*.s
-./vendor
+vendor
 llvm-build
 llvm-project
 build/*
@@ -37,9 +30,5 @@ test.exe
 test.gba
 test.hex
 test.nro
-test.uf2
 test.wasm
 wasm.wasm
-
-*.uf2
-*.elf
@@ -9,11 +9,10 @@
 	url = https://github.com/avr-rust/avr-mcu.git
 [submodule "lib/cmsis-svd"]
 	path = lib/cmsis-svd
-	url = https://github.com/cmsis-svd/cmsis-svd-data.git
-	branch = main
+	url = https://github.com/tinygo-org/cmsis-svd
 [submodule "lib/wasi-libc"]
 	path = lib/wasi-libc
-	url = https://github.com/WebAssembly/wasi-libc
+	url = https://github.com/CraneStation/wasi-libc
 [submodule "lib/picolibc"]
 	path = lib/picolibc
 	url = https://github.com/keith-packard/picolibc.git
@@ -32,13 +31,3 @@
 [submodule "lib/macos-minimal-sdk"]
 	path = lib/macos-minimal-sdk
 	url = https://github.com/aykevl/macos-minimal-sdk.git
-[submodule "src/net"]
-	path = src/net
-	url = https://github.com/tinygo-org/net.git
-	branch = dev
-[submodule "lib/wasi-cli"]
-	path = lib/wasi-cli
-	url = https://github.com/WebAssembly/wasi-cli
-[submodule "lib/bdwgc"]
-	path = lib/bdwgc
-	url = https://github.com/ivmai/bdwgc.git
@@ -18,8 +18,7 @@ tarball. If you want to help with development of TinyGo itself, you should follo
 LLVM, Clang and LLD are quite light on dependencies, requiring only standard
 build tools to be built. Go is of course necessary to build TinyGo itself.

-  * Go (1.19+)
-  * GNU Make
+  * Go (1.18+)
  * Standard build tools (gcc/clang)
  * git
  * CMake
@@ -28,21 +27,6 @@ build tools to be built. Go is of course necessary to build TinyGo itself.
 The rest of this guide assumes you're running Linux, but it should be equivalent
 on a different system like Mac.

-## Using GNU Make
-
-The static build of TinyGo is driven by GNUmakefile, which provides a help target for quick reference:
-
-    % make help
-    clean                           Remove build directory
-    fmt                             Reformat source
-    fmt-check                       Warn if any source needs reformatting
-    gen-device                      Generate microcontroller-specific sources
-    llvm-source                     Get LLVM sources
-    llvm-build                      Build LLVM
-    tinygo                          Build the TinyGo compiler
-    lint                            Lint source tree
-    spell                           Spellcheck source tree
-
 ## Download the source

 The first step is to download the TinyGo sources (use `--recursive` if you clone
@@ -1,871 +1,3 @@
-0.37.0
---
-* **general**
-  - add the Boehm-Demers-Weiser GC on Linux
-* **ci**
-  - add more tests for wasm and baremetal
-* **compiler**
-  - crypto/internal/sysrand is allowed to use unsafe signatures
-* **examples**
-  - add goroutine benchmark to examples
-* **fixes**
-  - ensure use of pointers for SPI interface on atsam21/atsam51 and other machines/boards that were missing implementation (#4798)
-  - replace loop counter with hw timer for USB SetAddressReq on rp2040 (#4796)
-* **internal**
-  - update to go.bytecodealliance.org@v0.6.2 in GNUmakefile and internal/wasm-tools
-  - exclude certain files when copying package in internal/cm
-  - update to go.bytecodealliance.org/cm@v0.2.2 in internal/cm
-  - remove old reflect.go in internal/reflectlite
-* **loader**
-  - use build tags for package iter and iter methods on reflect.Value in loader, iter, reflect
-  - add shim for go1.22 and earlier in loader, iter
-* **machine**
-  - bump rp2040 to 200MHz (#4768)
-  - correct register address for Pin.SetInterrupt for rp2350 (#4782)
-  - don't block the rp2xxx UART interrupt handler
-  - fix RP2040 Pico board on the playground
-  - add flash support for rp2350 (#4803)
-* **os**
-  - add stub Symlink for wasm
-* **refactor**
-  - use *SPI everywhere to make consistent for implementations. Fixes #4663 "in reverse" by making SPI a pointer everywhere, as discussed in the comments.
-* **reflect**
-  - add Value.SetIter{Key,Value} and MapIter.Reset in reflect, internal/reflectlite
-  - embed reflectlite types into reflect types in reflect, internal/reflectlite
-  - add Go 1.24 iter.Seq[2] methods
-  - copy reflect iter tests from upstream Go
-  - panic on Type.CanSeq[2] instead of returning false
-  - remove strconv.go
-  - remove unused go:linkname functions
-* **riscv-qemu**
-  - add VirtIO RNG device
-  - increase stack size
-* **runtime**
-  - only allocate heap memory when needed
-  - remove unused file func.go
-  - use package reflectlite
-* **transform**
-  - cherry-pick from #4774
-
-
-0.36.0
---
-* **general**
-  - add initial Go 1.24 support
-  - add support for LLVM 19
-  - update license for 2025
-  - make small corrections for README regarding wasm
-  - use GOOS and GOARCH for building wasm simulated boards
-  - only infer target for wasm when GOOS and GOARCH are set correctly, not just based on file extension
-  - add test-corpus-wasip2
-  - use older image for cross-compiling builds
-  - update Linux builds to run on ubuntu-latest since 20.04 is being retired
-  - ensure build output directory is created
-  - add NoSandbox flag to chrome headless that is run during WASM tests, since this is now required for Ubuntu 23+ and we are using Ubuntu 24+ when running Github Actions
-  - update wasmtime used for CI to 29.0.1 to fix issue with install during CI tests
-  - update to use `Get-CimInstance` as `wmic` is being deprecated on WIndows
-  - remove unnecessary executable permissions
-  - `goenv`: update to new v0.36.0 development version
-* **compiler**
-  - `builder`: fix parsing of external ld.lld error messages
-  - `cgo`: mangle identifier names
-  - `interp`: correctly mark functions as modifying memory
-  - add buildmode=wasi-legacy to support existing base of users who expected the older behavior for wasi modules to not return an exit code as if they were reactors
-* **standard library**
-  - `crypto/tls`: add Dialer.DialContext() to fix websocket client
-  - `crypto/tls`: add VersionTLS constants and VersionName(version uint16) method that turns it into a string, copied from big go
-  - `internal/syscall/unix`: use our own version of this package
-  - `machine`: replace hard-coded cpu frequencies on rp2xxx
-  - `machine`: bump rp2350 CPUFrequency to 150 MHz
-  - `machine`: compute rp2 clock dividers from crystal and target frequency
-  - `machine`: remove bytes package dependency in flash code
-  - `machine/usb/descriptor`: avoid bytes package
-  - `net`: update to latest submodule with httptest subpackage and ResolveIPAddress implementation
-  - `os`: add File.Chdir support
-  - `os`: implement stub Chdir for non-OS systems
-  - `os/file`: add file.Chmod
-  - `reflect`: implement Value.Equal
-  - `runtime`: add FIPS helper functions
-  - `runtime`: manually initialize xorshift state
-  - `sync`: move Mutex to internal/task
-  - `syscall`: add wasip1 RandomGet
-  - `testing`: add Chdir
-  - `wasip2`: add stubs to get internal/syscall/unix to work
-* **fixes**
-  - correctly handle calls for GetRNG() when being made from nrf devices with SoftDevice enabled
-  - fix stm32f103 ADC
-  - `wasm`: correctly handle id lookup for finalizeRef call
-  - `wasm`: avoid total failure on wasm finalizer call
-  - `wasm`: convert offset as signed int into unsigned int in syscall/js.stringVal in wasm_exec.js
-* **targets**
-  - rp2350: add pll generalized solution; fix ADC handles; pwm period fix
-  - rp2350: extending support to include the rp2350b
-  - rp2350: cleanup: unexport internal USB and clock package variable, consts and types
-  - nrf: make ADC resolution changeable
-  - turn on GC for TKey1 device, since it does in fact work
-  - match Pico2 stack size to Pico
-* **boards**
-  - add support for Pimoroni Pico Plus2
-  - add target for pico2-w board
-  - add comboat_fw tag for elecrow W5 boards with Combo-AT Wifi firmware
-  - add support for Elecrow Pico rp2350 W5 boards
-  - add support for Elecrow Pico rp2040 W5 boards
-  - add support for NRF51 HW-651
-  - add support for esp32c3-supermini
-  - add support for waveshare-rp2040-tiny
-* **examples**
-  - add naive debouncing for pininterrupt example
-
-
-0.35.0
---
-* **general**
-  - update cmsis-svd library
-  - use default UART settings in the echo example
-  - `goenv`: also show git hash with custom build of TinyGo
-  - `goenv`: support parsing development versions of Go
-  - `main`: parse extldflags early so we can report the error message
-* **compiler**
-  - `builder`: whitelist temporary directory env var for Clang invocation to fix Windows bug
-  - `builder`: fix cache paths in `-size=full` output
-  - `builder`: work around incorrectly escaped DWARF paths on Windows (Clang bug)
-  - `builder`: fix wasi-libc path names on Windows with `-size=full`
-  - `builder`: write HTML size report
-  - `cgo`: support C identifiers only referred to from within macros
-  - `cgo`: support function-like macros
-  - `cgo`: support errno value as second return parameter
-  - `cgo`: add support for `#cgo noescape` lines
-  - `compiler`: fix bug in interrupt lowering
-  - `compiler`: allow panic directly in `defer`
-  - `compiler`: fix wasmimport -> wasmexport in error message
-  - `compiler`: support `//go:noescape` pragma
-  - `compiler`: report error instead of crashing when instantiating a generic function without body
-  - `interp`: align created globals
-* **standard library**
-  - `machine`: modify i2s interface/implementation to better match specification
-  - `os`: implement `StartProcess`
-  - `reflect`: add `Value.Clear`
-  - `reflect`: add interface support to `NumMethods`
-  - `reflect`: fix `AssignableTo` for named + non-named types
-  - `reflect`: implement `CanConvert`
-  - `reflect`: handle more cases in `Convert`
-  - `reflect`: fix Copy of non-pointer array with size > 64bits
-  - `runtime`: don't call sleepTicks with a negative duration
-  - `runtime`: optimize GC scanning (findHead)
-  - `runtime`: move constants into shared package
-  - `runtime`: add `runtime.fcntl` function for internal/syscall/unix
-  - `runtime`: heapptr only needs to be initialized once
-  - `runtime`: refactor scheduler (this fixes a few bugs with `-scheduler=none`)
-  - `runtime`: rewrite channel implementation to be smaller and more flexible
-  - `runtime`: use `SA_RESTART` when registering a signal for os/signal
-  - `runtime`: implement race-free signals using futexes
-  - `runtime`: run deferred functions in `Goexit`
-  - `runtime`: remove `Cond` which seems to be unused
-  - `runtime`: properly handle unix read on directory
-  - `runtime/trace`: stub all public methods
-  - `sync`: don't use volatile in `Mutex`
-  - `sync`: implement `WaitGroup` using a (pseudo)futex
-  - `sync`: make `Cond` parallelism-safe
-  - `syscall`: use wasi-libc tables for wasm/js target
-* **targets**
-  - `mips`: fix a bug when scanning the stack
-  - `nintendoswitch`: get this target to compile again
-  - `rp2350`: add support for the new RP2350
-  - `rp2040/rp2350` : make I2C implementation shared for rp2040/rp2350
-  - `rp2040/rp2350` : make SPI implementation shared for rp2040/rp2350
-  - `rp2040/rp2350` : make RNG implementation shared for rp2040/rp2350
-  - `wasm`: revise and simplify wasmtime argument handling
-  - `wasm`: support `//go:wasmexport` functions after a call to `time.Sleep`
-  - `wasm`: correctly return from run() in wasm_exec.js
-  - `wasm`: call process.exit() when go.run() returns
-  - `windows`: don't return, exit via exit(0) instead to flush stdout buffer
-* **boards**
-  - add support for the Tillitis TKey
-  - add support for the Raspberry Pi Pico2 (based on the RP2040)
-  - add support for Pimoroni Tiny2350
-
-
-0.34.0
---
-* **general**
-  - fix `GOOS=wasip1` for `tinygo test`
-  - add `-C DIR` flag
-  - add initial documentation for project governance
-  - add `-ldflags='-extldflags=...'` support
-  - improve usage message with `tinygo help` and when passing invalid parameters
-* **compiler**
-  - `builder`: remove environment variables when invoking Clang, to avoid the environment changing the behavior
-  - `builder`: check for the Go toolchain version used to compile TinyGo
-  - `cgo`: add `C.CBytes` implementation
-  - `compiler`: fix passing weirdly-padded structs as parameters to new goroutines
-  - `compiler`: support pragmas on generic functions
-  - `compiler`: do not let the slice buffer escape when casting a `[]byte` or `[]rune` to a string, to help escape analysis
-  - `compiler`: conform to the latest iteration of the wasm types proposal
-  - `loader`: don't panic when main package is not named 'main'
-  - `loader`: make sure we always return type checker errors even without type errors
-  - `transform`: optimize range over `[]byte(string)`
-* **standard library**
-  - `crypto/x509`: add package stub to build crypto/x509 on macOS
-  - `machine/usb/adc/midi`: fix `PitchBend`
-  - `os`: add `Truncate` stub for baremetal
-  - `os`: add stubs for `os.File` deadlines
-  - `os`: add internal `net.newUnixFile` for the net package
-  - `runtime`: stub runtime_{Before,After}Exec for linkage
-  - `runtime`: randomize map accesses
-  - `runtime`: support `maps.Clone`
-  - `runtime`: add more fields to `MemStats`
-  - `runtime`: implement newcoro, coroswitch to support package iter
-  - `runtime`: disallow defer in interrupts
-  - `runtime`: add support for os/signal on Linux and MacOS
-  - `runtime`: add gc layout info for some basic types to help the precise GC
-  - `runtime`: bump GC mark stack size to avoid excessive heap rescans
-* **targets**
-  - `darwin`: use Go standard library syscall package instead of a custom one
-  - `fe310`: support GPIO `PinInput`
-  - `mips`: fix compiler crash with GOMIPS=softfloat and defer
-  - `mips`: add big-endian (GOARCH=mips) support
-  - `mips`: use MIPS32 (instead of MIPS32R2) as the instruction set for wider compatibility
-  - `wasi`: add relative and absolute --dir options to wasmtime args
-  - `wasip2`: add wasmtime -S args to support network interfaces
-  - `wasm`: add `//go:wasmexport` support (for all WebAssembly targets)
-  - `wasm`: use precise instead of conservative GC for WebAssembly (including WASI)
-  - `wasm-unknown`: add bulk memory flags since basically every runtime has it now
-* **boards**
-  - add RAKwireless RAK4631
-  - add WaveShare ESP-C3-32S-Kit
-
-
-0.33.0
---
-
-* **general**
-  - use latest version of x/tools
-  - add chromeos 9p support for flashing
-  - sort compiler error messages by source position in a package
-  - don't include prebuilt libraries in the release to simplify packaging and reduce the release tarball size
-  - show runtime panic addresses for `tinygo run`
-  - support Go 1.23 (including all new language features)
-  - `test`: support GOOS/GOARCH pairs in the `-target` flag
-  - `test`: remove message after test binary built
-* **compiler**
-  - remove unused registers for x86_64 linux syscalls
-  - remove old atomics workaround for AVR (not necessary in modern LLVM versions)
-  - support `golang.org/x/sys/unix` syscalls
-  - `builder`: remove workaround for generics race condition
-  - `builder`: add package ID to compiler and optimization error messages
-  - `builder`: show better error messages for some common linker errors
-  - `cgo`: support preprocessor macros passed on the command line
-  - `cgo`: use absolute paths for error messages
-  - `cgo`: add support for printf
-  - `loader`: handle `go list` errors inside TinyGo (for better error messages)
-  - `transform`: fix incorrect alignment of heap-to-stack transform
-  - `transform`: use thinlto-pre-link passes (instead of the full pipeline) to speed up compilation speed slightly
-* **standard library**
-  - `crypto/tls`: add CipherSuiteName and some extra fields to ConnectionSTate
-  - `internal/abi`: implement initial version of this package
-  - `machine`: use new `internal/binary` package
-  - `machine`: rewrite Reply() to fix sending long replies in I2C Target Mode
-  - `machine/usb/descriptor`: Reset joystick physical
-  - `machine/usb/descriptor`: Drop second joystick hat
-  - `machine/usb/descriptor`: Add more HID... functions
-  - `machine/usb/descriptor`: Fix encoding of values
-  - `machine/usb/hid/joystick`: Allow more hat switches
-  - `os`: add `Chown`, `Truncate`
-  - `os/user`: use stdlib version of this package
-  - `reflect`: return correct name for the `unsafe.Pointer` type
-  - `reflect`: implement `Type.Overflow*` functions
-  - `runtime`: implement dummy `getAuxv` to satisfy golang.org/x/sys/
-  - `runtime`: don't zero out new allocations for `-gc=leaking` when they are already zeroed
-  - `runtime`: simplify slice growing/appending code
-  - `runtime`: print a message when a fatal signal like SIGSEGV happens
-  - `runtime/debug`: add `GoVersion` to `debug.BuildInfo`
-  - `sync`: add `Map.Clear()`
-  - `sync/atomic`: add And* and Or* compiler intrinsics needed for Go 1.23
-  - `syscall`: add `Fork` and `Execve`
-  - `syscall`: add all MacOS errno values
-  - `testing`: stub out `T.Deadline`
-  - `unique`: implement custom (naive) version of the unique package
-* **targets**
-  - `arm`: support `GOARM=*,softfloat` (softfloat support for ARM v5, v6, and v7)
-  - `mips`: add linux/mipsle (and experimental linux/mips) support
-  - `mips`: add `GOMIPS=softfloat` support
-  - `wasip2`: add WASI preview 2 support
-  - `wasm/js`: add `node:` prefix in `require()` call of wasm_exec.js
-  - `wasm-unknown`: make sure the `os` package can be imported
-  - `wasm-unknown`: remove import-memory flag
-
-
-0.32.0
---
-
-* **general**
-  - fix wasi-libc include headers on Nix
-  - apply OpenOCD commands after target configuration
-  - fix a minor race condition when determining the build tags
-  - support UF2 drives with a space in their name on Linux
-  - add LLVM 18 support
-  - drop support for Go 1.18 to be able to stay up to date
-
-* **compiler**
-  - move `-panic=trap` support to the compiler/runtime
-  - fix symbol table index for WebAssembly archives
-  - fix ed25519 build errors by adjusting the alias names
-  - add aliases to generic AES functions
-  - fix race condition by temporarily applying a proposed patch
-  - `builder`: keep un-wasm-opt'd .wasm if -work was passed
-  - `builder`: make sure wasm-opt command line is printed if asked
-  - `cgo`: implement shift operations in preprocessor macros
-  - `interp`: checking for methodset existence
-
-* **standard library**
-  - `machine`: add `__tinygo_spi_tx` function to simulator
-  - `machine`: fix simulator I2C support
-  - `machine`: add GetRNG support to simulator
-  - `machine`: add `TxFifoFreeLevel` for CAN
-  - `os`: add `Link`
-  - `os`: add `FindProcess` for posix
-  - `os`: add `Process.Release` for unix
-  - `os`: add `SetReadDeadline` stub
-  - `os`, `os/signal`: add signal stubs
-  - `os/user`: add stubs for `Lookup{,Group}` and `Group`
-  - `reflect`: use int in `StringHeader` and `SliceHeader` on non-AVR platforms
-  - `reflect`: fix `NumMethods` for Interface type
-  - `runtime`: skip negative sleep durations in sleepTicks
-
-* **targets**
-  - `esp32`: add I2C support
-  - `rp2040`: move UART0 and UART1 to common file
-  - `rp2040`: make all RP2040 boards available for simulation
-  - `rp2040`: fix timeUnit type
-  - `stm32`: add i2c `Frequency` and `SetBaudRate` function for chips that were missing implementation
-  - `wasm-unknown`: add math and memory builtins that LLVM needs
-  - `wasip1`: replace existing `-target=wasi` support with wasip1 as supported in Go 1.21+
-
-* **boards**
-  - `adafruit-esp32-feather-v2`: add the Adafruit ESP32 Feather V2
-  - `badger2040-w`: add support for the Badger2040 W
-  - `feather-nrf52840-sense`: fix lack of LXFO
-  - `m5paper`: add support for the M5 Paper
-  - `mksnanov3`: limit programming speed to 1800 kHz
-  - `nucleol476rg`: add stm32 nucleol476rg support
-  - `pico-w`: add the Pico W (which is near-idential to the pico target)
-  - `thingplus-rp2040`, `waveshare-rp2040-zero`: add WS2812 definition
-  - `pca10059-s140v7`: add this variant to the PCA10059 board
-
-
-0.31.2
---
-
-* **general**
-  * update the `net` submodule to updated version with `Buffers` implementation
-
-* **compiler**
-  * `syscall`: add wasm_unknown tag to some additional files so it can compile more code
-
-* **standard library**
-  * `runtime`: add Frame.Entry field
-
-
-0.31.1
---
-
-* **general**
-  * fix Binaryen build in make task
-  * update final build stage of Docker `dev` image to go1.22
-  * only use GHA cache for building Docker `dev` image
-  * update the `net` submodule to latest version
-
-* **compiler**
-  * `interp`: make getelementptr offsets signed
-  * `interp`: return a proper error message when indexing out of range
-
-
-0.31.0
---
-
-* **general**
-  * remove LLVM 14 support
-  * add LLVM 17 support, and use it by default
-  * add Nix flake support
-  * update bundled Binaryen to version 116
-  * add `ports` subcommand that lists available serial ports for `-port` and `-monitor`
-  * support wasmtime version 14
-  * add `-serial=rtt` for serial output over SWD
-  * add Go 1.22 support and use it by default
-  * change minimum Node.js version from 16 to 18
-* **compiler**
-  * use the new LLVM pass manager
-  * allow systems with more stack space to allocate larger values on the stack
-  * `build`: fix a crash due to sharing GlobalValues between build instances
-  * `cgo`: add `C._Bool` type
-  * `cgo`: fix calling CGo callback inside generic function
-  * `compileopts`: set `purego` build tag by default so that more packages can be built
-  * `compileopts`: force-enable CGo to avoid build issues
-  * `compiler`: fix crash on type assert on interfaces with no methods
-  * `interp`: print LLVM instruction in traceback
-  * `interp`: support runtime times by running them at runtime
-  * `loader`: enforce Go language version in the type checker (this may break existing programs with an incorrect Go version in go.mod)
-  * `transform`: fix bug in StringToBytes optimization pass
-* **standard library**
-  * `crypto/tls`: stub out a lot of functions
-  * `internal/task`, `machine`: make TinyGo code usable with "big Go" CGo
-  * `machine`: implement `I2C.SetBaudRate` consistently across chips
-  * `machine`: implement `SPI.Configure` consistently across chips
-  * `machine`: add `DeviceID` for nrf, rp2040, sam, stm32
-  * `machine`: use smaller UART buffer size on atmega chips
-  * `machine/usb`: allow setting a serial number using a linker flag
-  * `math`: support more math functions on baremetal (picolibc) systems
-  * `net`: replace entire net package with a new one based on the netdev driver
-  * `os/user`: add bare-bones implementation of this package
-  * `reflect`: stub `CallSlice` and `FuncOf`
-  * `reflect`: add `TypeFor[T]`
-  * `reflect`: update `IsZero` to Go 1.22 semantics
-  * `reflect`: move indirect values into interface when setting interfaces
-  * `runtime`: stub `Breakpoint`
-  * `sync`: implement trylock
-* **targets**
-  * `atmega`: use UART double speed mode for fewer errors and higher throughput
-  * `atmega328pb`: refactor to enable extra uart
-  * `avr`: don't compile large parts of picolibc (math, stdio) for LLVM 17 support
-  * `esp32`: switch over to the official SVD file
-  * `esp32c3`: implement USB_SERIAL for USBCDC communication
-  * `esp32c3`: implement I2C
-  * `esp32c3`: implement RNG
-  * `esp32c3`: add more ROM functions and update linker script for the in-progress wifi support
-  * `esp32c3`: update to newer SVD files
-  * `rp2040`: add support for UART hardware flow control
-  * `rp2040`: add definition for `machine.PinToggle`
-  * `rp2040`: set XOSC startup delay multiplier
-  * `samd21`: add support for UART hardware flow control
-  * `samd51`: add support for UART hardware flow control
-  * `wasm`: increase default stack size to 64k for wasi/wasm targets
-  * `wasm`: bump wasi-libc version to SDK 20
-  * `wasm`: remove line of dead code in wasm_exec.js
-* **new targets/boards**
-  * `qtpy-esp32c3`: add Adafruit QT Py ESP32-C3 board
-  * `mksnanov3`: add support for the MKS Robin Nano V3.x
-  * `nrf52840-generic`: add generic nrf52840 chip support
-  * `thumby`: add support for Thumby
-  * `wasm`: add new `wasm-unknown` target that doesn't depend on WASI or a browser
-* **boards**
-  * `arduino-mkrwifi1010`, `arduino-nano33`, `nano-rp2040`, `matrixportal-m4`, `metro-m4-airlift`, `pybadge`, `pyportal`: add `ninafw` build tag and some constants for BLE support
-  * `gopher-badge`: fix typo in USB product name
-  * `nano-rp2040`: add UART1 and correct mappings for NINA via UART
-  * `pico`: bump default stack size from 2kB to 8kB
-  * `wioterminal`: expose UART4
-
-
-0.30.0
---
-
-* **general**
-  - add LLVM 16 support, use it by default
-* **compiler**
-  - `build`: work around a race condition by building Go SSA serially
-  - `compiler`: fix a crash by not using the LLVM global context types
-  - `interp`: don't copy unknown values in `runtime.sliceCopy` to fix miscompile
-  - `interp`: fix crash in error report by not returning raw LLVM values
-* **standard library**
-  - `machine/usb/adc/midi`: various improvements and API changes
-  - `reflect`: add support for `[...]T` → `[]T` in reflect
-* **targets**
-  - `atsamd21`, `atsamd51`: add support for USB INTERRUPT OUT
-  - `rp2040`: always use the USB device enumeration fix, even in chips that supposedly have the HW fix
-  - `wasm`: increase default stack size to 32k for wasi/wasm
-* **boards**
-  - `gobadge`: add GoBadge target as alias for PyBadge :)
-  - `gemma-m0`: add support for the Adafruit Gemma M0
-
-
-0.29.0
---
-
-* **general**
-  - Go 1.21 support
-  - use https for renesas submodule #3856
-  - ci: rename release-double-zipped to something more useful
-  - ci: update Node.js from version 14 to version 16
-  - ci: switch GH actions builds to use Go 1.21 final release
-  - docker: update clang to version 15
-  - docker: use Go 1.21 for Docker dev container build
-  - `main`: add target JSON file in `tinygo info` output
-  - `main`: improve detection of filesystems
-  - `main`: use `go env` instead of doing all detection manually
-  - make: add make task to generate Renesas device wrappers
-  - make: add task to check NodeJS version before running tests
-  - add submodule for Renesas SVD file mirror repo
-  - update to go-serial package v1.6.0
-  - `testing`: add Testing function
-  - `tools/gen-device-svd`: small changes needed for Renesas MCUs
-* **compiler**
-  - `builder`: update message for max supported Go version
-  - `compiler,reflect`: NumMethods reports exported methods only
-  - `compiler`: add compiler-rt and wasm symbols to table
-  - `compiler`: add compiler-rt to wasm.json
-  - `compiler`: add min and max builtin support
-  - `compiler`: implement clear builtin for maps
-  - `compiler`: implement clear builtin for slices
-  - `compiler`: improve panic message when a runtime call is unavailable
-  - `compiler`: update .ll test output
-  - `loader`: merge go.env file which is now required starting in Go 1.21 to correctly get required packages
-* **standard library**
-  - `os`: define ErrNoDeadline
-  - `reflect`: Add FieldByNameFunc
-  - `reflect`: add SetZero
-  - `reflect`: fix iterating over maps with interface{} keys
-  - `reflect`: implement Value.Grow
-  - `reflect`: remove unnecessary heap allocations
-  - `reflect`: use .key() instead of a type assert
-  - `sync`: add implementation from upstream Go for OnceFunc, OnceValue, and OnceValues
-* **targets**
-  - `machine`: UART refactor (#3832)
-  - `machine/avr`: pin change interrupt
-  - `machine/macropad_rp2040`: add machine.BUTTON
-  - `machine/nrf`: add I2C timeout
-  - `machine/nrf`: wait for stop condition after reading from the I2C bus
-  - `machine/nRF52`: set SPI TX/RX lengths even data is empty. Fixes #3868 (#3877)
-  - `machine/rp2040`: add missing suffix to CMD_READ_STATUS
-  - `machine/rp2040`: add NoPin support
-  - `machine/rp2040`: move flash related functions into separate file from C imports for correct  - LSP. Fixes #3852
-  - `machine/rp2040`: wait for 1000 us after flash reset to avoid issues with busy USB bus
-  - `machine/samd51,rp2040,nrf528xx,stm32`: implement watchdog
-  - `machine/samd51`: fix i2cTimeout was decreasing due to cache activation
-  - `machine/usb`: Add support for HID Keyboard LEDs
-  - `machine/usb`: allow USB Endpoint settings to be changed externally
-  - `machine/usb`: refactor endpoint configuration
-  - `machine/usb`: remove usbDescriptorConfig
-  - `machine/usb/hid,joystick`: fix hidreport (3) (#3802)
-  - `machine/usb/hid`: add RxHandler interface
-  - `machine/usb/hid`: rename Handler() to TxHandler()
-  - `wasi`: allow zero inodes when reading directories
-  - `wasm`: add support for GOOS=wasip1
-  - `wasm`: fix functions exported through //export
-  - `wasm`: remove i64 workaround, use BigInt instead
-  - `example`: adjust time offset
-  - `example`: simplify pininterrupt
-* **boards**
-  - `targets`: add AKIZUKI DENSHI AE-RP2040
-  - `targets`: adding new uf2 target for PCA10056 (#3765)
-
-
-0.28.0
---
-
-* **general**
-  - fix parallelism in the compiler on Windows by building LLVM with thread support
-  - support qemu-user debugging
-  - make target JSON msd-volume-name an array
-  - print source location when a panic happens in -monitor
-  - `test`: don't print `ok` for a successful compile-only
-* **compiler**
-  - `builder`: remove non-ThinLTO build mode
-  - `builder`: fail earlier if Go is not available
-  - `builder`: improve `-size=full` in a number of ways
-  - `builder`: implement Nordic DFU file writer in Go
-  - `cgo`: allow `LDFLAGS: --export=...`
-  - `compiler`: support recursive slice types
-  - `compiler`: zero struct padding during map operations
-  - `compiler`: add llvm.ident metadata
-  - `compiler`: remove `unsafe.Pointer(uintptr(v) + idx)` optimization (use `unsafe.Add` instead)
-  - `compiler`: add debug info to `//go:embed` data structures for better `-size` output
-  - `compiler`: add debug info to string constants
-  - `compiler`: fix a minor race condition
-  - `compiler`: emit correct alignment in debug info for global variables
-  - `compiler`: correctly generate reflect data for local named types
-  - `compiler`: add alloc attributes to `runtime.alloc`, reducing flash usage slightly
-  - `compiler`: for interface maps, use the original named type if available
-  - `compiler`: implement most math/bits functions as LLVM intrinsics
-  - `compiler`: ensure all defers have been seen before creating rundefers
-* **standard library**
-  - `internal/task`: disallow blocking inside an interrupt
-  - `machine`: add `CPUReset`
-  - `machine/usb/hid`: add MediaKey support
-  - `machine/usb/hid/joystick`: move joystick under HID
-  - `machine/usb/hid/joystick`: allow joystick settings override
-  - `machine/usb/hid/joystick`: handle case where we cannot find the correct HID descriptor
-  - `machine/usb/hid/mouse`: add support for mouse back and forward
-  - `machine/usb`: add ability to override default VID, PID, manufacturer name, and product name
-  - `net`: added missing `TCPAddr` and `UDPAddr` implementations
-  - `os`: add IsTimeout function
-  - `os`: fix resource leak in `(*File).Close`
-  - `os`: add `(*File).Sync`
-  - `os`: implement `(*File).ReadDir` for wasi
-  - `os`: implement `(*File).WriteAt`
-  - `reflect`: make sure null bytes are supported in tags
-  - `reflect`: refactor this package to enable many new features
-  - `reflect`: add map type methods: `Elem` and `Key`
-  - `reflect`: add map methods: `MapIndex`, `MapRange`/`MapIter`, `SetMapIndex`, `MakeMap`, `MapKeys`
-  - `reflect`: add slice methods: `Append`, `MakeSlice`, `Slice`, `Slice3`, `Copy`, `Bytes`, `SetLen`
-  - `reflect`: add misc methods: `Zero`, `Addr`, `UnsafeAddr`, `OverflowFloat`, `OverflowInt`, `OverflowUint`, `SetBytes`, `Convert`, `CanInt`, `CanFloat`, `CanComplex`, `Comparable`
-  - `reflect`: add type methods: `String`, `PkgPath`, `FieldByName`, `FieldByIndex`, `NumMethod`
-  - `reflect`: add stubs for `Type.Method`, `CanConvert`, `ArrayOf`, `StructOf`, `MapOf`
-  - `reflect`: add stubs for channel select routines/types
-  - `reflect`: allow nil rawType to call Kind()
-  - `reflect`: ensure all ValueError panics have Kind fields
-  - `reflect`: add support for named types
-  - `reflect`: improve `Value.String()`
-  - `reflect`: set `Index` and `PkgPath` field in `Type.Field`
-  - `reflect`: `Type.AssignableTo`: you can assign anything to `interface{}`
-  - `reflect`: add type check to `Value.Field`
-  - `reflect`: let `TypeOf(nil)` return nil
-  - `reflect`: move `StructField.Anonymous` field to match upstream location
-  - `reflect`: add `UnsafePointer` for Func types
-  - `reflect`: `MapIter.Next` needs to allocate new keys/values every time
-  - `reflect`: fix `IsNil` for interfaces
-  - `reflect`: fix `Type.Name` to return an empty string for non-named types
-  - `reflect`: add `VisibleFields`
-  - `reflect`: properly handle embedded structs
-  - `reflect`: make sure `PointerTo` works for named types
-  - `reflect`: `Set`: convert non-interface to interface
-  - `reflect`: `Set`: fix direction of assignment check
-  - `reflect`: support channel directions
-  - `reflect`: print struct tags in Type.String()
-  - `reflect`: properly handle read-only values
-  - `runtime`: allow custom-gc SetFinalizer and clarify KeepAlive
-  - `runtime`: implement KeepAlive using inline assembly
-  - `runtime`: check for heap allocations inside interrupts
-  - `runtime`: properly turn pointer into empty interface when hashing
-  - `runtime`: improve map size hint usage
-  - `runtime`: zero map key/value on deletion to so GC doesn't see them
-  - `runtime`: print the address where a panic happened
-  - `runtime/debug`: stub `SetGCPercent`, `BuildInfo.Settings`
-  - `runtime/metrics`: add this package as a stub
-  - `syscall`: `Stat_t` timespec fields are Atimespec on darwin
-  - `syscall`: add `Timespec.Unix()` for wasi
-  - `syscall`: add fsync using libc
-  - `testing`: support -test.count
-  - `testing`: make test output unbuffered when verbose
-  - `testing`: add -test.skip
-  - `testing`: move runtime.GC() call to runN to match upstream
-  - `testing`: add -test.shuffle to order randomize test and benchmark order
-* **targets**
-  - `arm64`: fix register save/restore to include vector registers
-  - `attiny1616`: add support for this chip
-  - `cortexm`: refactor EnableInterrupts and DisableInterrupts to avoid `arm.AsmFull`
-  - `cortexm`: enable functions in RAM for go & cgo
-  - `cortexm`: convert SystemStack from `AsmFull` to C inline assembly
-  - `cortexm`: fix crash due to wrong stack size offset
-  - `nrf`: samd21, stm32: add flash API
-  - `nrf`: fix memory issue in ADC read
-  - `nrf`: new peripheral type for nrf528xx chips
-  - `nrf`: implement target mode
-  - `nrf`: improve ADC and add oversampling, longer sample time, and reference voltage
-  - `rp2040`: change calling order for device enumeration fix to do first
-  - `rp2040`: rtc delayed interrupt
-  - `rp2040`: provide better errors for invalid pins on I2C and SPI
-  - `rp2040`: change uart to allow for a single pin
-  - `rp2040`: implement Flash interface
-  - `rp2040`: remove SPI `DataBits` property
-  - `rp2040`: unify all linker scripts using LDFLAGS
-  - `rp2040`: remove SPI deadline for improved performance
-  - `rp2040`: use 4MHz as default frequency for SPI
-  - `rp2040`: implement target mode
-  - `rp2040`: use DMA for send-only SPI transfers
-  - `samd21`: rearrange switch case for get pin cfg
-  - `samd21`: fix issue with WS2812 driver by making pin accesses faster
-  - `samd51`: enable CMCC cache for greatly improved performance
-  - `samd51`: remove extra BK0RDY clear
-  - `samd51`: implement Flash interface
-  - `samd51`: use correct SPI frequency
-  - `samd51`: remove extra BK0RDY clear
-  - `samd51`: fix ADC multisampling
-  - `wasi`: allow users to set the `runtime_memhash_tsip` or `runtime_memhash_fnv` build tags
-  - `wasi`: set `WASMTIME_BACKTRACE_DETAILS` when running in wasmtime.
-  - `wasm`: implement the `//go:wasmimport` directive
-* **boards**
-  - `gameboy-advance`: switch to use register definitions in device/gba
-  - `gameboy-advance`: rename display and make pointer receivers
-  - `gopher-badge`: Added Gopher Badge support
-  - `lorae5`: add needed definition for UART2
-  - `lorae5`: correct mapping for I2C bus, add pin mapping to enable power
-  - `pinetime`: update the target file (rename from pinetime-devkit0)
-  - `qtpy`: fix bad pin assignment
-  - `wioterminal`: fix pin definition of BCM13
-  - `xiao`: Pins D4 & D5 are I2C1. Use pins D2 & D3 for I2C0.
-  - `xiao`: add DefaultUART
-
-
-0.27.0
---
-
-* **general**
-  - all: update musl
-  - all: remove "acm:"` prefix for USB vid/pid pair
-  - all: add support for LLVM 15
-  - all: use DWARF version 4
-  - all: add initial (incomplete) support for Go 1.20
-  - all: add `-gc=custom` option
-  - `main`: print ldflags including ThinLTO flags with -x
-  - `main`: fix error message when a serial port can't be accessed
-  - `main`: add `-timeout` flag to allow setting how long TinyGo will try looking for a MSD volume for flashing
-  - `test`: print PASS on pass when running standalone test binaries
-  - `test`: fix printing of benchmark output
-  - `test`: print package name when compilation failed (not just when the test failed)
-* **compiler**
-  - refactor to support LLVM 15
-  - `builder`: print compiler commands while building a library
-  - `compiler`: fix stack overflow when creating recursive pointer types (fix for LLVM 15+ only)
-  - `compiler`: allow map keys and values of ≥256 bytes
-  - `cgo`: add support for `C.float` and `C.double`
-  - `cgo`: support anonymous enums included in multiple Go files
-  - `cgo`: add support for bitwise operators
-  - `interp`: add support for constant icmp instructions
-  - `transform`: fix memory corruption issues
-* **standard library**
-  - `machine/usb`: remove allocs in USB ISR
-  - `machine/usb`: add `Port()` and deprecate `New()` to have the API better match the singleton that is actually being returned
-  - `machine/usb`: change HID usage-maximum to 0xFF
-  - `machine/usb`: add USB HID joystick support
-  - `machine/usb`: change to not send before endpoint initialization
-  - `net`: implement `Pipe`
-  - `os`: add stub for `os.Chtimes`
-  - `reflect`: stub out `Type.FieldByIndex`
-  - `reflect`: add `Value.IsZero` method
-  - `reflect`: fix bug in `.Field` method when the field fits in a pointer but the parent doesn't
-  - `runtime`: switch some `panic()` calls in the gc to `runtimePanic()` for consistency
-  - `runtime`: add xorshift-based fastrand64
-  - `runtime`: fix alignment for arm64, arm, xtensa, riscv
-  - `runtime`: implement precise GC
-  - `runtime/debug`: stub `PrintStack`
-  - `sync`: implement simple pooling in `sync.Pool`
-  - `syscall`: stubbed `Setuid`, Exec and friends
-  - `syscall`: add more stubs as needed for Go 1.20 support
-  - `testing`: implement `t.Setenv`
-  - `unsafe`: add support for Go 1.20 slice/string functions
-* **targets**
-  - `all`: do not set stack size per board
-  - `all`: update picolibc to v1.7.9
-  - `atsame5x`: fix CAN extendedID handling
-  - `atsame5x`: reduce heap allocation
-  - `avr`: drop GNU toolchain dependency
-  - `avr`: fix .data initialization for binaries over 64kB
-  - `avr`: support ThinLTO
-  - `baremetal`: implements calloc
-  - `darwin`: fix `syscall.Open` on darwin/arm64
-  - `darwin`: fix error with `tinygo lldb`
-  - `esp`: use LLVM Xtensa linker instead of Espressif toolchain
-  - `esp`: use ThinLTO for Xtensa
-  - `esp32c3`: add SPI support
-  - `linux`: include musl `getpagesize` function in release
-  - `nrf51`: add ADC implementation
-  - `nrf52840`: add PDM support
-  - `riscv`: add "target-abi" metadata flag
-  - `rp2040`: remove mem allocation in GPIO ISR
-  - `rp2040`: avoid allocating clock on heap
-  - `rp2040`: add basic GPIO support for PIO
-  - `rp2040`: fix USB interrupt issue
-  - `rp2040`: fix RP2040-E5 USB errata
-  - `stm32`: always set ADC pins to pullups floating
-  - `stm32f1`, `stm32f4`: fix ADC by clearing the correct bit for rank after each read
-  - `stm32wl`: Fix incomplete RNG initialisation
-  - `stm32wlx`: change order for init so clock speeds are set before peripheral start
-  - `wasi`: makes wasmtime "run" explicit
-  - `wasm`: fix GC scanning of allocas
-  - `wasm`: allow custom malloc implementation
-  - `wasm`: remove `-wasm-abi=` flag (use `-target` instead)
-  - `wasm`: fix scanning of the stack
-  - `wasm`: fix panic when allocating 0 bytes using malloc
-  - `wasm`: always run wasm-opt even with `-scheduler=none`
-  - `wasm`: avoid miscompile with ThinLTO
-  - `wasm`: allow the emulator to expand `{tmpDir}`
-  - `wasm`: support ThinLTO
-  - `windows`: update mingw-w64 version to avoid linker warning
-  - `windows`: add ARM64 support
-* **boards**
-  - Add Waveshare RP2040 Zero
-  - Add Arduino Leonardo support
-  - Add Adafruit KB2040
-  - Add Adafruit Feather M0 Express
-  - Add Makerfabs ESP32C3SPI35 TFT Touchscreen board
-  - Add Espressif ESP32-C3-DevKit-RUST-1 board
-  - `lgt92`: fix OpenOCD configuration
-  - `xiao-rp2040`: fix D9 and D10 constants
-  - `xiao-rp2040`: add pin definitions
-
-0.26.0
---
-
-* **general**
-  - remove support for LLVM 13
-  - remove calls to deprecated ioutil package
-  - move from `os.IsFoo` to `errors.Is(err, ErrFoo)`
-  - fix for builds using an Android host
-  - make interp timeout configurable from command line
-  - ignore ports with VID/PID if there is no candidates
-  - drop support for Go 1.16 and Go 1.17
-  - update serial package to v1.3.5 for latest bugfixes
-  - remove GOARM from `tinygo info`
-  - add flag for setting the goroutine stack size
-  - add serial port monitoring functionality
-* **compiler**
-  - `cgo`: implement support for static functions
-  - `cgo`: fix panic when FuncType.Results is nil
-  - `compiler`: add aliases for `edwards25519/field.feMul` and `field.feSquare`
-  - `compiler`: fix incorrect DWARF type in some generic parameters
-  - `compiler`: use LLVM math builtins everywhere
-  - `compiler`: replace some math operation bodies with LLVM intrinsics
-  - `compiler`: replace math aliases with intrinsics
-  - `compiler`: fix `unsafe.Sizeof` for chan and map values
-  - `compileopts`: use tags parser from buildutil
-  - `compileopts`: use backticks for regexp to avoid extra escapes
-  - `compileopts`: fail fast on duplicate values in target field slices
-  - `compileopts`: fix windows/arm target triple
-  - `compileopts`: improve error handling when loading target/*.json
-  - `compileopts`: add support for stlink-dap programmer
-  - `compileopts`: do not complain about `-no-debug` on MacOS
-  - `goenv`: support `GOOS=android`
-  - `interp`: fix reading from external global
-  - `loader`: fix link error for `crypto/internal/boring/sig.StandardCrypto`
-* **standard library**
-  - rename assembly files to .S extension
-  - `machine`: add PWM peripheral comments to pins
-  - `machine`: improve UARTParity slightly
-  - `machine`: do not export DFU_MAGIC_* constants on nrf52840
-  - `machine`: rename `PinInputPullUp`/`PinInputPullDown`
-  - `machine`: add `KHz`, `MHz`, `GHz` constants, deprecate `TWI_FREQ_*` constants
-  - `machine`: remove level triggered pin interrupts
-  - `machine`: do not expose `RESET_MAGIC_VALUE`
-  - `machine`: use `NoPin` constant where appropriate (instead of `0` for example)
-  - `net`: sync net.go with Go 1.18 stdlib
-  - `os`: add `SyscallError.Timeout`
-  - `os`: add `ErrProcessDone` error
-  - `reflect`: implement `CanInterface` and fix string `Index`
-  - `runtime`: make `MemStats` available to leaking collector
-  - `runtime`: add `MemStats.TotalAlloc`
-  - `runtime`: add `MemStats.Mallocs` and `Frees`
-  - `runtime`: add support for `time.NewTimer` and `time.NewTicker`
-  - `runtime`: implement `resetTimer`
-  - `runtime`: ensure some headroom for the GC to run
-  - `runtime`: make gc and scheduler asserts settable with build tags
-  - `runtime/pprof`: add `WriteHeapProfile`
-  - `runtime/pprof`: `runtime/trace`: stub some additional functions
-  - `sync`: implement `Map.LoadAndDelete`
-  - `syscall`: group WASI consts by purpose
-  - `syscall`: add WASI `{D,R}SYNC`, `NONBLOCK` FD flags
-  - `syscall`: add ENOTCONN on darwin
-  - `testing`: add support for -benchmem
-* **targets**
-  - remove USB vid/pid pair of bootloader
-  - `esp32c3`: remove unused `UARTStopBits` constants
-  - `nrf`: implement `GetRNG` function
-  - `nrf`: `rp2040`: add `machine.ReadTemperature`
-  - `nrf52`: cleanup s140v6 and s140v7 uf2 targets
-  - `rp2040`: implement semi-random RNG based on ROSC based on pico-sdk
-  - `wasm`: add summary of wasm examples and fix callback bug
-  - `wasm`: do not allow undefined symbols (`--allow-undefined`)
-  - `wasm`: make sure buffers returned by `malloc` are kept until `free` is called
-  - `windows`: save and restore xmm registers when switching goroutines
-* **boards**
-  - add Pimoroni's Tufty2040
-  - add XIAO ESP32C3
-  - add Adafruit QT2040
-  - add Adafruit QT Py RP2040
-  - `esp32c3-12f`: `matrixportal-m4`: `p1am-100`: remove duplicate build tags
-  - `hifive1-qemu`: remove this emulated board
-  - `wioterminal`: add UART3 for RTL8720DN
-  - `xiao-ble`: fix usbpid
-
-
 0.25.0
 ---

@@ -1103,7 +235,7 @@
  - `interp`: always run atomic and volatile loads/stores at runtime
  - `interp`: bump timeout to 180 seconds
  - `interp`: handle type assertions on nil interfaces
-  - `loader`: eliminate goroot cache inconsistency
+  - `loader`: elminate goroot cache inconsistency
  - `loader`: respect $GOROOT when running `go list`
  - `transform`: allocate the correct amount of bytes in an alloca
  - `transform`: remove switched func lowering
@@ -1802,7 +934,7 @@
  - `sync`: add WaitGroup
 * **targets**
  - `arm`: allow nesting in DisableInterrupts and EnableInterrupts
-  - `arm`: make FPU configuration consistent
+  - `arm`: make FPU configuraton consistent
  - `arm`: do not mask fault handlers in critical sections
  - `atmega2560`: fix pin mapping for pins D2, D5 and the L port
  - `atsamd`: return an error when an incorrect PWM pin is used
@@ -1831,7 +963,7 @@
  - `nrf`: add microbit-s110v8 target
  - `nrf`: fix bug in SPI.Tx
  - `nrf`: support debugging the PCA10056
-  - `pygamer`: add Adafruit PyGamer support
+  - `pygamer`: add Adafruit PyGamer suport
  - `riscv`: fix interrupt configuration bug
  - `riscv`: disable linker relaxations during gp init
  - `stm32f4disco`: add new target with ST-Link v2.1 debugger
@@ -2193,7 +1325,7 @@
  - allow packages like github.com/tinygo-org/tinygo/src/\* by aliasing it
  - remove `//go:volatile` support  
    It has been replaced with the runtime/volatile package.
-  - allow pointers in map keys
+  - allow poiners in map keys
  - support non-constant syscall numbers
  - implement non-blocking selects
  - add support for the `-tags` flag
@@ -1,15 +1,10 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.24 AS tinygo-llvm
+FROM golang:1.19 AS tinygo-llvm

 RUN apt-get update && \
-    apt-get install -y apt-utils make cmake clang-15 ninja-build && \
-    rm -rf \
-        /var/lib/apt/lists/* \
-        /var/log/* \
-        /var/tmp/* \
-        /tmp/*
+    apt-get install -y apt-utils make cmake clang-11 binutils-avr gcc-avr avr-libc ninja-build

-COPY ./GNUmakefile /tinygo/GNUmakefile
+COPY ./Makefile /tinygo/Makefile

 RUN cd /tinygo/ && \
    make llvm-source
@@ -20,24 +15,36 @@ FROM tinygo-llvm AS tinygo-llvm-build
 RUN cd /tinygo/ && \
    make llvm-build

-# tinygo-compiler-build stage builds the compiler itself
-FROM tinygo-llvm-build AS tinygo-compiler-build
+# tinygo-xtensa stage installs tools needed for ESP32
+FROM tinygo-llvm-build AS tinygo-xtensa
+
+ARG xtensa_version="1.22.0-80-g6c4433a-5.2.0"
+RUN cd /tmp/ && \
+    wget -q https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-${xtensa_version}.tar.gz && \
+    tar xzf xtensa-esp32-elf-linux64-${xtensa_version}.tar.gz && \
+    cp ./xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/ && \
+    rm -rf /tmp/xtensa*
+
+# tinygo-compiler stage builds the compiler itself
+FROM tinygo-xtensa AS tinygo-compiler

 COPY . /tinygo

-# build the compiler and tools
+# update submodules
 RUN cd /tinygo/ && \
-    git submodule update --init && \
+    rm -rf ./lib/*/ && \
+    git submodule sync && \
+    git submodule update --init --recursive --force
+
+RUN cd /tinygo/ && \
+    make
+
+# tinygo-tools stage installs the needed dependencies to compile TinyGo programs for all platforms.
+FROM tinygo-compiler AS tinygo-tools
+
+RUN cd /tinygo/ && \
+    make wasi-libc binaryen && \
    make gen-device -j4 && \
-    make build/release
+    cp build/* $GOPATH/bin/

-# tinygo-compiler copies the compiler build over to a base Go container (without
-# all the build tools etc).
-FROM golang:1.24 AS tinygo-compiler
-
-# Copy tinygo build.
-COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo
-
-# Configure the container.
-ENV PATH="${PATH}:/tinygo/bin"
 CMD ["tinygo"]
@@ -1,32 +0,0 @@
-TinyGo Team Members
-===================
-
-The team of humans who maintain TinyGo.
-
-*   **Purpose**: To maintain the community, code, documentation, and tools for the TinyGo compiler.
-*   **Board**: The group of people who share responsibility for key decisions for the TinyGo organization.  
-    *   **Majority Voting**: The board makes decisions by majority vote.
-    *   **Membership**: The board elects its own members.
-*   **Do-ocracy**: Those who step forward to do a given task propose how it should be done. Then other interested people can make comments.
-*   **Proof of Work**: Power in decision-making is slightly weighted based on a participant's labor for the community.
-*   **Initiation**: We need to establish a procedure for how people join the team of maintainers.
-*   **Transparency**: Important information should be made publicly available, ideally in a way that allows for public comment.
-*   **Code of Conduct**: Participants agree to abide by the current project Code of Conduct.
-
-## Members
-
-* Ayke van Laethem (@aykevl)
-* Daniel Esteban (@conejoninja)
-* Ron Evans (@deadprogram)
-* Damian Gryski (@dgryski)
-* Masaaki Takasago (@sago35)
-* Patricio Whittingslow (@soypat)
-* Yurii Soldak (@ysoldak)
-
-## Experimental
-
-*   **Monthly Meeting**: A monthly meeting for the team and any other interested participants.  
-    Duration: 1 hour  
-    Facilitation: @deadprogram
-    Schedule: See https://github.com/tinygo-org/tinygo/wiki/Meetings for more information
-
@@ -1,7 +1,7 @@
-Copyright (c) 2018-2025 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2022 The TinyGo Authors. All rights reserved.

 TinyGo includes portions of the Go standard library.
-Copyright (c) 2009-2024 The Go Authors. All rights reserved.
+Copyright (c) 2009-2022 The Go Authors. All rights reserved.

 TinyGo includes portions of LLVM, which is under the Apache License v2.0 with
 LLVM Exceptions. See https://llvm.org/LICENSE.txt for license information.
@@ -8,20 +8,13 @@ LLVM_PROJECTDIR ?= llvm-project
 CLANG_SRC ?= $(LLVM_PROJECTDIR)/clang
 LLD_SRC ?= $(LLVM_PROJECTDIR)/lld

-ifeq ($(OS),Windows_NT)
-    # avoid calling uname on Windows
-    uname := Windows_NT
-else
-    uname := $(shell uname -s)
-endif
-
 # Try to autodetect LLVM build tools.
 # Versions are listed here in descending priority order.
-LLVM_VERSIONS = 19 18 17 16 15
+LLVM_VERSIONS = 14 13 12 11
 errifempty = $(if $(1),$(1),$(error $(2)))
 detect = $(shell which $(call errifempty,$(firstword $(foreach p,$(2),$(shell command -v $(p) 2> /dev/null && echo $(p)))),failed to locate $(1) at any of: $(2)))
 toolSearchPathsVersion = $(1)-$(2)
-ifeq ($(uname),Darwin)
+ifeq ($(shell uname -s),Darwin)
 	# Also explicitly search Brew's copy, which is not in PATH by default.
 	BREW_PREFIX := $(shell brew --prefix)
 	toolSearchPathsVersion += $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)-$(2) $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)
@@ -34,20 +27,27 @@ LLVM_NM ?= $(call findLLVMTool,llvm-nm)

 # Go binary and GOROOT to select
 GO ?= go
+export GOROOT = $(shell $(GO) env GOROOT)

 # Flags to pass to go test.
-GOTESTFLAGS ?=
-GOTESTPKGS ?= ./builder ./cgo ./compileopts ./compiler ./interp ./transform .
+GOTESTFLAGS ?= -v
+
+# md5sum binary
+MD5SUM = md5sum

 # tinygo binary for tests
 TINYGO ?= $(call detect,tinygo,tinygo $(CURDIR)/build/tinygo)

 # Check for ccache if the user hasn't set it to on or off.
 ifeq (, $(CCACHE))
-    LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(if $(shell command -v ccache 2> /dev/null),ON,OFF)'
-else
-    LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(CCACHE)'
+    # Use CCACHE for LLVM if possible
+    ifneq (, $(shell command -v ccache 2> /dev/null))
+        CCACHE := ON
+    else
+        CCACHE := OFF
+    endif
 endif
+LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(CCACHE)'

 # Allow enabling LLVM assertions
 ifeq (1, $(ASSERT))
@@ -56,12 +56,6 @@ else
    LLVM_OPTION += '-DLLVM_ENABLE_ASSERTIONS=OFF'
 endif

-# Enable AddressSanitizer
-ifeq (1, $(ASAN))
-    LLVM_OPTION += -DLLVM_USE_SANITIZER=Address
-    CGO_LDFLAGS += -fsanitize=address
-endif
-
 ifeq (1, $(STATIC))
    # Build TinyGo as a fully statically linked binary (no dynamically loaded
    # libraries such as a libc). This is not supported with glibc which is used
@@ -113,15 +107,17 @@ endif

 .PHONY: all tinygo test $(LLVM_BUILDDIR) llvm-source clean fmt gen-device gen-device-nrf gen-device-nxp gen-device-avr gen-device-rp

-LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb executionengine frontenddriver frontendhlsl frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsdriver windowsmanifest
+LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb executionengine frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsmanifest

 ifeq ($(OS),Windows_NT)
    EXE = .exe
    START_GROUP = -Wl,--start-group
    END_GROUP = -Wl,--end-group

-    # PIC needs to be disabled for libclang to work.
-    LLVM_OPTION += -DLLVM_ENABLE_PIC=OFF
+    # LLVM compiled using MinGW on Windows appears to have problems with threads.
+    # Without this flag, linking results in errors like these:
+    #     libLLVMSupport.a(Threading.cpp.obj):Threading.cpp:(.text+0x55): undefined reference to `std::thread::hardware_concurrency()'
+    LLVM_OPTION += -DLLVM_ENABLE_THREADS=OFF -DLLVM_ENABLE_PIC=OFF

    CGO_CPPFLAGS += -DCINDEX_NO_EXPORTS
    CGO_LDFLAGS += -static -static-libgcc -static-libstdc++
@@ -129,15 +125,15 @@ ifeq ($(OS),Windows_NT)

    USE_SYSTEM_BINARYEN ?= 1

-else ifeq ($(uname),Darwin)
-    MD5SUM ?= md5
+else ifeq ($(shell uname -s),Darwin)
+    MD5SUM = md5

    CGO_LDFLAGS += -lxar

    USE_SYSTEM_BINARYEN ?= 1

-else ifeq ($(uname),FreeBSD)
-    MD5SUM ?= md5
+else ifeq ($(shell uname -s),FreeBSD)
+    MD5SUM = md5
    START_GROUP = -Wl,--start-group
    END_GROUP = -Wl,--end-group
 else
@@ -145,11 +141,8 @@ else
    END_GROUP = -Wl,--end-group
 endif

-# md5sum binary default, can be overridden by an environment variable
-MD5SUM ?= md5sum
-
 # Libraries that should be linked in for the statically linked Clang.
-CLANG_LIB_NAMES = clangAnalysis clangAPINotes clangAST clangASTMatchers clangBasic clangCodeGen clangCrossTU clangDriver clangDynamicASTMatchers clangEdit clangExtractAPI clangFormat clangFrontend clangFrontendTool clangHandleCXX clangHandleLLVM clangIndex clangInstallAPI clangLex clangParse clangRewrite clangRewriteFrontend clangSema clangSerialization clangSupport clangTooling clangToolingASTDiff clangToolingCore clangToolingInclusions
+CLANG_LIB_NAMES = clangAnalysis clangAST clangASTMatchers clangBasic clangCodeGen clangCrossTU clangDriver clangDynamicASTMatchers clangEdit clangFormat clangFrontend clangFrontendTool clangHandleCXX clangHandleLLVM clangIndex clangLex clangParse clangRewrite clangRewriteFrontend clangSema clangSerialization clangTooling clangToolingASTDiff clangToolingCore clangToolingInclusions
 CLANG_LIBS = $(START_GROUP) $(addprefix -l,$(CLANG_LIB_NAMES)) $(END_GROUP) -lstdc++

 # Libraries that should be linked in for the statically linked LLD.
@@ -157,7 +150,7 @@ LLD_LIB_NAMES = lldCOFF lldCommon lldELF lldMachO lldMinGW lldWasm
 LLD_LIBS = $(START_GROUP) $(addprefix -l,$(LLD_LIB_NAMES)) $(END_GROUP)

 # Other libraries that are needed to link TinyGo.
-EXTRA_LIB_NAMES = LLVMInterpreter LLVMMCA LLVMRISCVTargetMCA LLVMX86TargetMCA
+EXTRA_LIB_NAMES = LLVMInterpreter LLVMMCA LLVMX86TargetMCA

 # All libraries to be built and linked with the tinygo binary (lib/lib*.a).
 LIB_NAMES = clang $(CLANG_LIB_NAMES) $(LLD_LIB_NAMES) $(EXTRA_LIB_NAMES)
@@ -168,26 +161,26 @@ LIB_NAMES = clang $(CLANG_LIB_NAMES) $(LLD_LIB_NAMES) $(EXTRA_LIB_NAMES)
 # library path (for ninja).
 # This list also includes a few tools that are necessary as part of the full
 # TinyGo build.
-NINJA_BUILD_TARGETS = clang llvm-config llvm-ar llvm-nm lld $(addprefix lib/lib,$(addsuffix .a,$(LIB_NAMES)))
+NINJA_BUILD_TARGETS = clang llvm-config llvm-ar llvm-nm $(addprefix lib/lib,$(addsuffix .a,$(LIB_NAMES)))

 # For static linking.
 ifneq ("$(wildcard $(LLVM_BUILDDIR)/bin/llvm-config*)","")
    CGO_CPPFLAGS+=$(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --cppflags) -I$(abspath $(LLVM_BUILDDIR))/tools/clang/include -I$(abspath $(CLANG_SRC))/include -I$(abspath $(LLD_SRC))/include
-    CGO_CXXFLAGS=-std=c++17
+    CGO_CXXFLAGS=-std=c++14
    CGO_LDFLAGS+=-L$(abspath $(LLVM_BUILDDIR)/lib) -lclang $(CLANG_LIBS) $(LLD_LIBS) $(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --ldflags --libs --system-libs $(LLVM_COMPONENTS)) -lstdc++ $(CGO_LDFLAGS_EXTRA)
 endif

-clean: ## Remove build directory
+clean:
 	@rm -rf build

 FMT_PATHS = ./*.go builder cgo/*.go compiler interp loader src transform
-fmt: ## Reformat source
+fmt:
 	@gofmt -l -w $(FMT_PATHS)
-fmt-check: ## Warn if any source needs reformatting
+fmt-check:
 	@unformatted=$$(gofmt -l $(FMT_PATHS)); [ -z "$$unformatted" ] && exit 0; echo "Unformatted:"; for fn in $$unformatted; do echo "  $$fn"; done; exit 1


-gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp gen-device-renesas ## Generate microcontroller-specific sources
+gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-kendryte gen-device-nxp gen-device-rp
 ifneq ($(STM32), 0)
 gen-device: gen-device-stm32
 endif
@@ -235,20 +228,18 @@ gen-device-rp: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/RaspberryPi lib/cmsis-svd/data/RaspberryPi/ src/device/rp/
 	GO111MODULE=off $(GO) fmt ./src/device/rp

-gen-device-renesas: build/gen-device-svd
-	./build/gen-device-svd -source=https://github.com/cmsis-svd/cmsis-svd-data/tree/master/data/Renesas lib/cmsis-svd/data/Renesas/ src/device/renesas/
-	GO111MODULE=off $(GO) fmt ./src/device/renesas
-
+# Get LLVM sources.
 $(LLVM_PROJECTDIR)/llvm:
-	git clone -b xtensa_release_19.1.2 --depth=1 https://github.com/espressif/llvm-project $(LLVM_PROJECTDIR)
-llvm-source: $(LLVM_PROJECTDIR)/llvm ## Get LLVM sources
+	git clone -b xtensa_release_14.0.0-patched --depth=1 https://github.com/tinygo-org/llvm-project $(LLVM_PROJECTDIR)
+llvm-source: $(LLVM_PROJECTDIR)/llvm

 # Configure LLVM.
 TINYGO_SOURCE_DIR=$(shell pwd)
 $(LLVM_BUILDDIR)/build.ninja:
-	mkdir -p $(LLVM_BUILDDIR) && cd $(LLVM_BUILDDIR) && cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;AVR;Mips;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=Xtensa" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_ZSTD=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_Z3_SOLVER=OFF -DLLVM_ENABLE_OCAMLDOC=OFF -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF -DCLANG_ENABLE_STATIC_ANALYZER=OFF -DCLANG_ENABLE_ARCMT=OFF $(LLVM_OPTION)
+	mkdir -p $(LLVM_BUILDDIR) && cd $(LLVM_BUILDDIR) && cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR;Xtensa" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_Z3_SOLVER=OFF -DLLVM_ENABLE_OCAMLDOC=OFF -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF -DCLANG_ENABLE_STATIC_ANALYZER=OFF -DCLANG_ENABLE_ARCMT=OFF $(LLVM_OPTION)

-$(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja ## Build LLVM
+# Build LLVM.
+$(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja
 	cd $(LLVM_BUILDDIR) && ninja $(NINJA_BUILD_TARGETS)

 ifneq ($(USE_SYSTEM_BINARYEN),1)
@@ -257,39 +248,36 @@ ifneq ($(USE_SYSTEM_BINARYEN),1)
 binaryen: build/wasm-opt$(EXE)
 build/wasm-opt$(EXE):
 	mkdir -p build
-	cd lib/binaryen && cmake -G Ninja . -DBUILD_STATIC_LIB=ON -DBUILD_TESTS=OFF -DENABLE_WERROR=OFF $(BINARYEN_OPTION) && ninja bin/wasm-opt$(EXE)
+	cd lib/binaryen && cmake -G Ninja . -DBUILD_STATIC_LIB=ON $(BINARYEN_OPTION) && ninja bin/wasm-opt$(EXE)
 	cp lib/binaryen/bin/wasm-opt$(EXE) build/wasm-opt$(EXE)
 endif

-# Generate WASI syscall bindings
-WASM_TOOLS_MODULE=go.bytecodealliance.org
-.PHONY: wasi-syscall
-wasi-syscall: wasi-cm
-	rm -rf ./src/internal/wasi/*
-	go run -modfile ./internal/wasm-tools/go.mod $(WASM_TOOLS_MODULE)/cmd/wit-bindgen-go generate --versioned -o ./src/internal -p internal --cm internal/cm ./lib/wasi-cli/wit
+# Build wasi-libc sysroot
+.PHONY: wasi-libc
+wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
+lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
+	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
+	cd lib/wasi-libc && make -j4 WASM_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC=$(CLANG) AR=$(LLVM_AR) NM=$(LLVM_NM)

-# Copy package cm into src/internal/cm
-.PHONY: wasi-cm
-wasi-cm:
-	rm -rf ./src/internal/cm/*
-	rsync -rv --delete --exclude go.mod --exclude '*_test.go' --exclude '*_json.go' --exclude '*.md' --exclude LICENSE $(shell go list -modfile ./internal/wasm-tools/go.mod -m -f {{.Dir}} $(WASM_TOOLS_MODULE)/cm)/ ./src/internal/cm

-# Check for Node.js used during WASM tests.
-MIN_NODEJS_VERSION=18
+# Build the Go compiler.
+tinygo:
+	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  make llvm-source"; echo "  make $(LLVM_BUILDDIR)"; exit 1; fi
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm osusergo" -ldflags="-X github.com/tinygo-org/tinygo/goenv.GitSha1=`git rev-parse --short HEAD`" .
+test: wasi-libc
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=20m -buildmode exe -tags "byollvm osusergo" ./builder ./cgo ./compileopts ./compiler ./interp ./transform .

-.PHONY: check-nodejs-version
-check-nodejs-version:
-	@# Check whether NodeJS is available.
-	@if ! command -v node 2>&1 >/dev/null; then echo "Install NodeJS version ${MIN_NODEJS_VERSION}+ to run tests."; exit 1; fi
-
-	@# Check whether the version is high enough.
-	@if [ "`node -v | sed 's/v\([0-9]\+\).*/\\1/g'`" -lt $(MIN_NODEJS_VERSION) ]; then echo "Install NodeJS version $(MIN_NODEJS_VERSION)+ to run tests."; exit 1; fi
-
-tinygo: ## Build the TinyGo compiler
-	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  $(MAKE) llvm-source"; echo "  $(MAKE) $(LLVM_BUILDDIR)"; exit 1; fi
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm osusergo" .
-test: check-nodejs-version
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm osusergo" $(GOTESTPKGS)
+# Check whether the machine package matches the documentation.
+# TODO: improve `tinygo targets` so it doesn't return these invalid targets.
+CHECK_MACHINE_EXCULDE = \
+	cortex-m-qemu \
+	particle-3rd-gen \
+	riscv-qemu \
+	riscv64-qemu \
+	rp2040 \
+	$(nil)
+check-machine:
+	$(GO) run ./tools/machinecheck $(filter-out $(CHECK_MACHINE_EXCULDE),$(shell $(TINYGO) targets))

 # Standard library packages that pass tests on darwin, linux, wasi, and windows, but take over a minute in wasi
 TEST_PACKAGES_SLOW = \
@@ -299,32 +287,25 @@ TEST_PACKAGES_SLOW = \

 # Standard library packages that pass tests quickly on darwin, linux, wasi, and windows
 TEST_PACKAGES_FAST = \
-	cmp \
-	compress/lzw \
 	compress/zlib \
 	container/heap \
 	container/list \
 	container/ring \
-	crypto/ecdsa \
-	crypto/elliptic \
+	crypto/des \
+	crypto/internal/subtle \
 	crypto/md5 \
+	crypto/rc4 \
 	crypto/sha1 \
 	crypto/sha256 \
 	crypto/sha512 \
-	database/sql/driver \
 	debug/macho \
 	embed/internal/embedtest \
 	encoding \
 	encoding/ascii85 \
-	encoding/asn1 \
 	encoding/base32 \
-	encoding/base64 \
 	encoding/csv \
 	encoding/hex \
-	go/ast \
-	go/format \
 	go/scanner \
-	go/version \
 	hash \
 	hash/adler32 \
 	hash/crc64 \
@@ -334,6 +315,7 @@ TEST_PACKAGES_FAST = \
 	internal/profile \
 	math \
 	math/cmplx \
+	net \
 	net/http/internal/ascii \
 	net/mail \
 	os \
@@ -346,26 +328,22 @@ TEST_PACKAGES_FAST = \
 	unicode \
 	unicode/utf16 \
 	unicode/utf8 \
-	unique \
 	$(nil)

+# Assume this will go away before Go2, so only check minor version.
+ifeq ($(filter $(shell $(GO) env GOVERSION | cut -f 2 -d.), 16 17 18), )
+TEST_PACKAGES_FAST += crypto/internal/nistec/fiat
+else
+TEST_PACKAGES_FAST += crypto/elliptic/internal/fiat
+endif
+
 # archive/zip requires os.ReadAt, which is not yet supported on windows
-# bytes requires mmap
 # compress/flate appears to hang on wasi
-# crypto/aes fails on wasi, needs panic()/recover()
-# crypto/des fails on wasi, needs panic()/recover()
+# compress/lzw appears to hang on wasi
 # crypto/hmac fails on wasi, it exits with a "slice out of range" panic
 # debug/plan9obj requires os.ReadAt, which is not yet supported on windows
-# image requires recover(), which is not yet supported on wasi
 # io/ioutil requires os.ReadDir, which is not yet supported on windows or wasi
-# mime: fail on wasi; neds panic()/recover()
-# mime/multipart: needs wasip1 syscall.FDFLAG_NONBLOCK
-# mime/quotedprintable requires syscall.Faccessat
-# net/mail: needs wasip1  syscall.FDFLAG_NONBLOCK
-# net/ntextproto: needs wasip1 syscall.FDFLAG_NONBLOCK
-# regexp/syntax: fails on wasip1; needs panic()/recover()
 # strconv requires recover() which is not yet supported on wasi
-# text/tabwriter requires recover(), which is not yet supported on wasi
 # text/template/parse requires recover(), which is not yet supported on wasi
 # testing/fstest requires os.ReadDir, which is not yet supported on windows or wasi

@@ -373,69 +351,28 @@ TEST_PACKAGES_FAST = \
 TEST_PACKAGES_LINUX := \
 	archive/zip \
 	compress/flate \
-	crypto/aes \
-	crypto/des \
+	compress/lzw \
 	crypto/hmac \
 	debug/dwarf \
 	debug/plan9obj \
-	image \
 	io/ioutil \
-	mime \
-	mime/multipart \
-	mime/quotedprintable \
-	net \
-	net/mail \
-	net/textproto \
-	os/user \
-	regexp/syntax \
 	strconv \
-	text/tabwriter \
+	testing/fstest \
 	text/template/parse

 TEST_PACKAGES_DARWIN := $(TEST_PACKAGES_LINUX)

-# os/user requires t.Skip() support
 TEST_PACKAGES_WINDOWS := \
 	compress/flate \
-	crypto/des \
+	compress/lzw \
 	crypto/hmac \
 	strconv \
 	text/template/parse \
 	$(nil)

-
-# These packages cannot be tested on wasm, mostly because these tests assume a
-# working filesystem. This could perhaps be fixed, by supporting filesystem
-# access when running inside Node.js.
-TEST_PACKAGES_WASM = $(filter-out $(TEST_PACKAGES_NONWASM), $(TEST_PACKAGES_FAST))
-TEST_PACKAGES_NONWASM = \
-	compress/lzw \
-	compress/zlib \
-	crypto/ecdsa \
-	debug/macho \
-	embed/internal/embedtest \
-	go/format \
-	os \
-	testing \
-	$(nil)
-
-# These packages cannot be tested on baremetal.
-#
-# Some reasons why the tests don't pass on baremetal:
-#
-#   * No filesystem is available, so packages like compress/zlib can't be tested
-#     (just like wasm).
-#   * picolibc math functions apparently are less precise, the math package
-#     fails on baremetal.
-TEST_PACKAGES_BAREMETAL = $(filter-out $(TEST_PACKAGES_NONBAREMETAL), $(TEST_PACKAGES_FAST))
-TEST_PACKAGES_NONBAREMETAL = \
-	$(TEST_PACKAGES_NONWASM) \
-	math \
-	$(nil)
-
 # Report platforms on which each standard library package is known to pass tests
+jointmp := $(shell echo /tmp/join.$$$$)
 report-stdlib-tests-pass:
-	$(eval jointmp := $(shell echo /tmp/join.$$$$))
 	@for t in $(TEST_PACKAGES_DARWIN); do echo "$$t darwin"; done | sort > $(jointmp).darwin
 	@for t in $(TEST_PACKAGES_LINUX); do echo "$$t linux"; done | sort > $(jointmp).linux
 	@for t in $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW); do echo "$$t darwin linux wasi windows"; done | sort > $(jointmp).portable
@@ -444,11 +381,11 @@ report-stdlib-tests-pass:
 	@rm $(jointmp).*

 # Standard library packages that pass tests quickly on the current platform
-ifeq ($(uname),Darwin)
+ifeq ($(shell uname),Darwin)
 TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_DARWIN)
 TEST_IOFS := true
 endif
-ifeq ($(uname),Linux)
+ifeq ($(shell uname),Linux)
 TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_LINUX)
 TEST_IOFS := true
 endif
@@ -476,67 +413,30 @@ tinygo-bench-fast:
 	$(TINYGO) test -bench . $(TEST_PACKAGES_HOST)

 # Same thing, except for wasi rather than the current platform.
-tinygo-test-wasm:
-	$(TINYGO) test -target wasm $(TEST_PACKAGES_WASM)
 tinygo-test-wasi:
-	$(TINYGO) test -target wasip1 $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
-tinygo-test-wasip1:
-	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
-tinygo-test-wasip1-fast:
-	$(TINYGO) test -target=wasip1 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
-
-tinygo-test-wasip2-slow:
-	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_SLOW)
-tinygo-test-wasip2-fast:
-	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
-
-tinygo-test-wasip2-sum-slow:
-	TINYGO=$(TINYGO) \
-	TARGET=wasip2 \
-	TESTOPTS="-x -work" \
-	PACKAGES="$(TEST_PACKAGES_SLOW)" \
-	gotestsum --raw-command -- ./tools/tgtestjson.sh
-tinygo-test-wasip2-sum-fast:
-	TINYGO=$(TINYGO) \
-	TARGET=wasip2 \
-	TESTOPTS="-x -work" \
-	PACKAGES="$(TEST_PACKAGES_FAST)" \
-	gotestsum --raw-command -- ./tools/tgtestjson.sh
-tinygo-bench-wasip1:
-	$(TINYGO) test -target wasip1 -bench . $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW)
-tinygo-bench-wasip1-fast:
-	$(TINYGO) test -target wasip1 -bench . $(TEST_PACKAGES_FAST)
-
-tinygo-bench-wasip2:
-	$(TINYGO) test -target wasip2 -bench . $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW)
-tinygo-bench-wasip2-fast:
-	$(TINYGO) test -target wasip2 -bench . $(TEST_PACKAGES_FAST)
-
-# Run tests on riscv-qemu since that one provides a large amount of memory.
-tinygo-test-baremetal:
-	$(TINYGO) test -target riscv-qemu $(TEST_PACKAGES_BAREMETAL)
+	$(TINYGO) test -target wasi $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+tinygo-test-wasi-fast:
+	$(TINYGO) test -target wasi $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+tinygo-bench-wasi:
+	$(TINYGO) test -target wasi -bench . $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW)
+tinygo-bench-wasi-fast:
+	$(TINYGO) test -target wasi -bench . $(TEST_PACKAGES_FAST)

 # Test external packages in a large corpus.
 test-corpus:
 	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml
 test-corpus-fast:
 	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus -short . -corpus=testdata/corpus.yaml
-test-corpus-wasi:
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasip1
-test-corpus-wasip2:
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasip2
+test-corpus-wasi: wasi-libc
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags byollvm -run TestCorpus . -corpus=testdata/corpus.yaml -target=wasi

-.PHONY: testchdir
-testchdir:
-	# test 'build' command with{,out} -C argument
-	$(TINYGO) build -C tests/testing/chdir chdir.go && rm tests/testing/chdir/chdir
-	$(TINYGO) build ./tests/testing/chdir/chdir.go && rm chdir
-	# test 'run' command with{,out} -C argument
-	EXPECT_DIR=$(PWD)/tests/testing/chdir $(TINYGO) run -C tests/testing/chdir chdir.go
-	EXPECT_DIR=$(PWD) $(TINYGO) run ./tests/testing/chdir/chdir.go
+tinygo-baremetal:
+	# Regression tests that run on a baremetal target and don't fit in either main_test.go or smoketest.
+	# regression test for #2666: e.g. encoding/hex must pass on baremetal
+	$(TINYGO) test -target cortex-m-qemu encoding/hex

 .PHONY: smoketest
-smoketest: testchdir
+smoketest:
 	$(TINYGO) version
 	$(TINYGO) targets > /dev/null
 	# regression test for #2892
@@ -546,8 +446,6 @@ smoketest: testchdir
 	# regression test for #2563
 	cd tests/os/smoke && $(TINYGO) test -c -target=pybadge && rm smoke.test
 	# test all examples (except pwm)
-	$(TINYGO) build -size short -o test.hex -target=pga2350             examples/echo
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/adc
@@ -574,45 +472,31 @@ smoketest: testchdir
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/pininterrupt
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=nano-rp2040         examples/rtcinterrupt
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/machinetest
+	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/serial
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/systick
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/test
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/time-offset
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/hid-mouse
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/hid-keyboard
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/i2c-target
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/watchdog
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/device-id
-	@$(MD5SUM) test.hex
 	# test simulated boards on play.tinygo.org
 ifneq ($(WASM), 0)
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=arduino              examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=arduino              examples/blinky1
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=hifive1b             examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=hifive1b             examples/blinky1
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=reelboard            examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=reelboard            examples/blinky1
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=microbit             examples/microbit-blink
+	$(TINYGO) build -size short -o test.wasm -tags=microbit             examples/microbit-blink
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=circuitplay_express  examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=circuitplay_express  examples/blinky1
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=circuitplay_bluefruit examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=circuitplay_bluefruit examples/blinky1
 	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=mch2022              examples/machinetest
-	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=gopher_badge         examples/blinky1
-	@$(MD5SUM) test.wasm
-	GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=pico                 examples/blinky1
+	$(TINYGO) build -size short -o test.wasm -tags=mch2022              examples/serial
 	@$(MD5SUM) test.wasm
 endif
 	# test all targets/boards
@@ -642,16 +526,12 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10059            examples/blinky2
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=bluemicro840        examples/blinky2
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-m0          examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=trinket-m0          examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=gemma-m0            examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-bluefruit examples/blinky1
@@ -682,14 +562,12 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=particle-xenon      examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pinetime            examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=pinetime-devkit0    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=x9pro               examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10056-s140v7     examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10059-s140v7     examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=reelboard-s140v7    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/blinky1
@@ -698,8 +576,6 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=xiao                examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=rak4631             examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/dac
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pyportal            examples/dac
@@ -710,7 +586,7 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-nrf52840  examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=qtpy                examples/machinetest
+	$(TINYGO) build -size short -o test.hex -target=qtpy                examples/serial
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=teensy41            examples/blinky1
 	@$(MD5SUM) test.hex
@@ -742,40 +618,20 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=qtpy-rp2040         examples/echo
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=kb2040              examples/echo
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=macropad-rp2040 	examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=badger2040          examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=badger2040-w        examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=tufty2040           examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=thingplus-rp2040    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=xiao-rp2040         examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=waveshare-rp2040-zero examples/echo
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=challenger-rp2040    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=trinkey-qt2040      examples/temp
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=gopher-badge      examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=ae-rp2040           examples/echo
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=thumby              examples/echo
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pico2               examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=tiny2350            examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pico-plus2          examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=waveshare-rp2040-tiny examples/echo
-	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
 	@$(MD5SUM) test.hex
@@ -790,8 +646,6 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-nrf52840    examples/usb-midi
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=nrf52840-s140v6-uf2-generic	examples/machinetest
-	@$(MD5SUM) test.hex
 ifneq ($(STM32), 0)
 	$(TINYGO) build -size short -o test.hex -target=bluepill            examples/blinky1
 	@$(MD5SUM) test.hex
@@ -807,8 +661,6 @@ ifneq ($(STM32), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-l432kc       examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=nucleo-l476rg       examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-l552ze       examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nucleo-wl55jc       examples/blinky1
@@ -827,17 +679,12 @@ ifneq ($(STM32), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=swan                examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=mksnanov3           examples/blinky1
-	@$(MD5SUM) test.hex
 endif
-	$(TINYGO) build -size short -o test.hex -target=atmega328pb         examples/blinkm
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/machinetest
+ifneq ($(AVR), 0)
+	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/serial
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino             examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=arduino-leonardo    examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino             examples/pwm
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino -scheduler=tasks  examples/blinky1
@@ -848,62 +695,38 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino-nano        examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=attiny1616          examples/empty
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark           examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark -gc=leaking examples/blinky1
 	@$(MD5SUM) test.hex
+endif
 ifneq ($(XTENSA), 0)
 	$(TINYGO) build -size short -o test.bin -target=esp32-mini32      	examples/blinky1
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   examples/blinky1
-	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=nodemcu             examples/blinky1
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target m5stack-core2       examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target m5stack-core2       examples/serial
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target m5stack             examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target m5stack             examples/serial
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target m5stick-c           examples/machinetest
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target m5paper             examples/machinetest
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target mch2022             examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target mch2022             examples/serial
 	@$(MD5SUM) test.bin
 endif
-	$(TINYGO) build -size short -o test.bin -target=esp-c3-32s-kit      examples/blinky1
+	$(TINYGO) build -size short -o test.bin -target=esp32c3             examples/serial
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=qtpy-esp32c3        examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-12f         examples/serial
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=m5stamp-c3          examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target=m5stamp-c3          examples/serial
 	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=xiao-esp32c3        examples/machinetest
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=esp32-c3-devkit-rust-1 examples/blinky1
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=esp32c3-12f         examples/blinky1
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=makerfabs-esp32c3spi35 examples/machinetest
+	$(TINYGO) build -size short -o test.bin -target=xiao-esp32c3        examples/serial
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.hex -target=hifive1b            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=maixbit             examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=tkey                examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=elecrow-rp2040      examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=elecrow-rp2350      examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=hw-651              examples/machinetest
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=hw-651-s110v8       examples/machinetest
-	@$(MD5SUM) test.hex	
 ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/export
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/main
-	$(TINYGO) build -size short -o wasm.wasm -target=wasm-unknown       examples/hello-wasm-unknown
 endif
 	# test various compiler flags
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -gc=none -scheduler=none examples/blinky1
@@ -912,16 +735,12 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -serial=none examples/echo
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10040 -serial=rtt examples/echo
-	@$(MD5SUM) test.hex
-	$(TINYGO) build             -o test.nro -target=nintendoswitch      examples/echo2
+	$(TINYGO) build             -o test.nro -target=nintendoswitch      examples/serial
 	@$(MD5SUM) test.nro
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -opt=0     ./testdata/stdlib.go
 	@$(MD5SUM) test.hex
 	GOOS=linux GOARCH=arm $(TINYGO) build -size short -o test.elf       ./testdata/cgo
-	GOOS=linux GOARCH=mips    $(TINYGO) build -size short -o test.elf   ./testdata/cgo
 	GOOS=windows GOARCH=amd64 $(TINYGO) build -size short -o test.exe   ./testdata/cgo
-	GOOS=windows GOARCH=arm64 $(TINYGO) build -size short -o test.exe   ./testdata/cgo
 	GOOS=darwin GOARCH=amd64 $(TINYGO) build  -size short -o test       ./testdata/cgo
 	GOOS=darwin GOARCH=arm64 $(TINYGO) build  -size short -o test       ./testdata/cgo
 ifneq ($(OS),Windows_NT)
@@ -934,14 +753,12 @@ endif
 wasmtest:
 	$(GO) test ./tests/wasm

-build/release: tinygo gen-device $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
+build/release: tinygo gen-device wasi-libc $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
 	@mkdir -p build/release/tinygo/bin
-	@mkdir -p build/release/tinygo/lib/bdwgc
 	@mkdir -p build/release/tinygo/lib/clang/include
 	@mkdir -p build/release/tinygo/lib/CMSIS/CMSIS
 	@mkdir -p build/release/tinygo/lib/macos-minimal-sdk
 	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
-	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-crt/stdio
 	@mkdir -p build/release/tinygo/lib/mingw-w64/mingw-w64-headers/defaults
 	@mkdir -p build/release/tinygo/lib/musl/arch
 	@mkdir -p build/release/tinygo/lib/musl/crt
@@ -949,16 +766,15 @@ build/release: tinygo gen-device $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binary
 	@mkdir -p build/release/tinygo/lib/nrfx
 	@mkdir -p build/release/tinygo/lib/picolibc/newlib/libc
 	@mkdir -p build/release/tinygo/lib/picolibc/newlib/libm
-	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-bottom-half
-	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
-	@mkdir -p build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@mkdir -p build/release/tinygo/lib/wasi-cli/
+	@mkdir -p build/release/tinygo/lib/wasi-libc
+	@mkdir -p build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0
+	@mkdir -p build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0plus
+	@mkdir -p build/release/tinygo/pkg/thumbv7em-unknown-unknown-eabi-cortex-m4
 	@echo copying source files
 	@cp -p  build/tinygo$(EXE)           build/release/tinygo/bin
 ifneq ($(USE_SYSTEM_BINARYEN),1)
 	@cp -p  build/wasm-opt$(EXE)         build/release/tinygo/bin
 endif
-	@cp -rp lib/bdwgc/*                  build/release/tinygo/lib/bdwgc
 	@cp -p $(abspath $(CLANG_SRC))/lib/Headers/*.h build/release/tinygo/lib/clang/include
 	@cp -rp lib/CMSIS/CMSIS/Include      build/release/tinygo/lib/CMSIS/CMSIS
 	@cp -rp lib/CMSIS/README.md          build/release/tinygo/lib/CMSIS
@@ -967,43 +783,29 @@ endif
 	@cp -rp lib/musl/arch/arm            build/release/tinygo/lib/musl/arch
 	@cp -rp lib/musl/arch/generic        build/release/tinygo/lib/musl/arch
 	@cp -rp lib/musl/arch/i386           build/release/tinygo/lib/musl/arch
-	@cp -rp lib/musl/arch/mips           build/release/tinygo/lib/musl/arch
 	@cp -rp lib/musl/arch/x86_64         build/release/tinygo/lib/musl/arch
 	@cp -rp lib/musl/crt/crt1.c          build/release/tinygo/lib/musl/crt
 	@cp -rp lib/musl/COPYRIGHT           build/release/tinygo/lib/musl
 	@cp -rp lib/musl/include             build/release/tinygo/lib/musl
-	@cp -rp lib/musl/src/conf            build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/ctype           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/env             build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/errno           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/exit            build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/fcntl           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/include         build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/internal        build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/legacy          build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/locale          build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/linux           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/malloc          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/mman            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/math            build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/misc            build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/multibyte       build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/sched           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/signal          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/stdio           build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/stdlib          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/string          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/thread          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/time            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/unistd          build/release/tinygo/lib/musl/src
-	@cp -rp lib/musl/src/process         build/release/tinygo/lib/musl/src
 	@cp -rp lib/mingw-w64/mingw-w64-crt/def-include                 build/release/tinygo/lib/mingw-w64/mingw-w64-crt
 	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/api-ms-win-crt-* build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
 	@cp -rp lib/mingw-w64/mingw-w64-crt/lib-common/kernel32.def.in  build/release/tinygo/lib/mingw-w64/mingw-w64-crt/lib-common
-	@cp -rp lib/mingw-w64/mingw-w64-crt/stdio/ucrt_*                build/release/tinygo/lib/mingw-w64/mingw-w64-crt/stdio
 	@cp -rp lib/mingw-w64/mingw-w64-headers/crt/                    build/release/tinygo/lib/mingw-w64/mingw-w64-headers
 	@cp -rp lib/mingw-w64/mingw-w64-headers/defaults/include        build/release/tinygo/lib/mingw-w64/mingw-w64-headers/defaults
-	@cp -rp lib/mingw-w64/mingw-w64-headers/include                 build/release/tinygo/lib/mingw-w64/mingw-w64-headers
 	@cp -rp lib/nrfx/*                   build/release/tinygo/lib/nrfx
 	@cp -rp lib/picolibc/newlib/libc/ctype       build/release/tinygo/lib/picolibc/newlib/libc
 	@cp -rp lib/picolibc/newlib/libc/include     build/release/tinygo/lib/picolibc/newlib/libc
@@ -1013,41 +815,17 @@ endif
 	@cp -rp lib/picolibc/newlib/libm/common      build/release/tinygo/lib/picolibc/newlib/libm
 	@cp -rp lib/picolibc/newlib/libm/math        build/release/tinygo/lib/picolibc/newlib/libm
 	@cp -rp lib/picolibc-stdio.c         build/release/tinygo/lib
-	@cp -rp lib/wasi-libc/libc-bottom-half/cloudlibc                build/release/tinygo/lib/wasi-libc/libc-bottom-half
-	@cp -rp lib/wasi-libc/libc-bottom-half/headers                  build/release/tinygo/lib/wasi-libc/libc-bottom-half
-	@cp -rp lib/wasi-libc/libc-bottom-half/sources                  build/release/tinygo/lib/wasi-libc/libc-bottom-half
-	@cp -rp lib/wasi-libc/libc-top-half/headers                     build/release/tinygo/lib/wasi-libc/libc-top-half
-	@cp -rp lib/wasi-libc/libc-top-half/musl/arch/generic           build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
-	@cp -rp lib/wasi-libc/libc-top-half/musl/arch/wasm32            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/arch
-	@cp -rp lib/wasi-libc/libc-top-half/musl/include                build/release/tinygo/lib/wasi-libc/libc-top-half/musl
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/conf               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/dirent             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/env                build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/errno              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/exit               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/fcntl              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/fenv               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/include            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/internal           build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/legacy             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/locale             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/math               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/misc               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/multibyte          build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/network            build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stat               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stdio              build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/stdlib             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/string             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/thread             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/time               build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/musl/src/unistd             build/release/tinygo/lib/wasi-libc/libc-top-half/musl/src
-	@cp -rp lib/wasi-libc/libc-top-half/sources                     build/release/tinygo/lib/wasi-libc/libc-top-half
-	@cp -rp lib/wasi-cli/wit                                        build/release/tinygo/lib/wasi-cli/wit
+	@cp -rp lib/wasi-libc/sysroot        build/release/tinygo/lib/wasi-libc/sysroot
 	@cp -rp llvm-project/compiler-rt/lib/builtins build/release/tinygo/lib/compiler-rt-builtins
 	@cp -rp llvm-project/compiler-rt/LICENSE.TXT  build/release/tinygo/lib/compiler-rt-builtins
 	@cp -rp src                          build/release/tinygo/src
 	@cp -rp targets                      build/release/tinygo/targets
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m0     -o build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0/compiler-rt     compiler-rt
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m0plus -o build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0plus/compiler-rt compiler-rt
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m4     -o build/release/tinygo/pkg/thumbv7em-unknown-unknown-eabi-cortex-m4/compiler-rt    compiler-rt
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m0     -o build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0/picolibc     picolibc
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m0plus -o build/release/tinygo/pkg/thumbv6m-unknown-unknown-eabi-cortex-m0plus/picolibc picolibc
+	./build/release/tinygo/bin/tinygo build-library -target=cortex-m4     -o build/release/tinygo/pkg/thumbv7em-unknown-unknown-eabi-cortex-m4/picolibc    picolibc

 release:
 	tar -czf build/release.tar.gz -C build/release tinygo
@@ -1058,40 +836,9 @@ deb:
 	@mkdir -p build/release-deb/usr/local/lib
 	cp -ar build/release/tinygo build/release-deb/usr/local/lib/tinygo
 	ln -sf ../lib/tinygo/bin/tinygo build/release-deb/usr/local/bin/tinygo
-	fpm -f -s dir -t deb -n tinygo -a $(DEB_ARCH) -v $(shell grep "const version = " goenv/version.go | awk '{print $$NF}') -m '@tinygo-org' --description='TinyGo is a Go compiler for small places.' --license='BSD 3-Clause' --url=https://tinygo.org/ --deb-changelog CHANGELOG.md -p build/release.deb -C ./build/release-deb
+	fpm -f -s dir -t deb -n tinygo -a $(DEB_ARCH) -v $(shell grep "const Version = " goenv/version.go | awk '{print $$NF}') -m '@tinygo-org' --description='TinyGo is a Go compiler for small places.' --license='BSD 3-Clause' --url=https://tinygo.org/ --deb-changelog CHANGELOG.md -p build/release.deb -C ./build/release-deb

 ifneq ($(RELEASEONLY), 1)
 release: build/release
 deb: build/release
 endif
-
-.PHONY: tools
-tools:
-	cd internal/tools && go generate -tags tools ./
-
-.PHONY: lint
-lint: tools ## Lint source tree
-	revive -version
-	# TODO: lint more directories!
-	# revive.toml isn't flexible enough to filter out just one kind of error from a checker, so do it with grep here.
-	# Can't use grep with friendly formatter.  Plain output isn't too bad, though.
-	# Use 'grep .' to get rid of stray blank line
-	revive -config revive.toml compiler/... src/{os,reflect}/*.go | grep -v "should have comment or be unexported" | grep '.' | awk '{print}; END {exit NR>0}'
-
-SPELLDIRSCMD=find . -depth 1 -type d  | egrep -wv '.git|lib|llvm|src'; find src -depth 1 | egrep -wv 'device|internal|net|vendor'; find src/internal -depth 1 -type d | egrep -wv src/internal/wasi
-.PHONY: spell
-spell: tools ## Spellcheck source tree
-	misspell -error --dict misspell.csv -i 'ackward,devided,extint,rela' $$( $(SPELLDIRSCMD) ) *.go *.md
-
-.PHONY: spellfix
-spellfix: tools ## Same as spell, but fixes what it finds
-	misspell -w --dict misspell.csv -i 'ackward,devided,extint,rela' $$( $(SPELLDIRSCMD) ) *.go *.md
-
-# https://www.client9.com/self-documenting-makefiles/
-.PHONY: help
-help:
-	@awk -F ':|##' '/^[^\t].+?:.*?##/ {\
-	gsub(/\$$\(LLVM_BUILDDIR\)/, "$(LLVM_BUILDDIR)"); \
-        printf "\033[36m%-30s\033[0m %s\n", $$1, $$NF \
-        }' $(MAKEFILE_LIST)
-#.DEFAULT_GOAL=help
@@ -1,13 +1,11 @@
 # TinyGo - Go compiler for small places

-[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![Nix](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml) [![CircleCI](https://circleci.com/gh/tinygo-org/tinygo/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/tinygo/tree/dev)
+[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![CircleCI](https://circleci.com/gh/tinygo-org/tinygo/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/tinygo/tree/dev)

-TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (wasm/wasi), and command-line tools.
+TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (Wasm), and command-line tools.

 It reuses libraries used by the [Go language tools](https://golang.org/pkg/go/) alongside [LLVM](http://llvm.org) to provide an alternative way to compile programs written in the Go programming language.

-## Embedded
-
 Here is an example program that blinks the built-in LED when run directly on any supported board with onboard LED:

 ```go
@@ -37,64 +35,111 @@ The above program can be compiled and run without modification on an Arduino Uno
 tinygo flash -target arduino examples/blinky1
 ```

-## WebAssembly
-
-TinyGo is very useful for compiling programs both for use in browsers (WASM) as well as for use on servers and other edge devices (WASI).
-
-TinyGo programs can run in [Fastly Compute](https://www.fastly.com/documentation/guides/compute/go/), [Fermyon Spin](https://developer.fermyon.com/spin/go-components), [wazero](https://wazero.io/languages/tinygo/) and many other WebAssembly runtimes.
-
-Here is a small TinyGo program for use by a WASI host application:
-
-```go
-package main
-
-//go:wasmexport add
-func add(x, y uint32) uint32 {
-	return x + y
-}
-```
-
-This compiles the above TinyGo program for use on any WASI Preview 1 runtime:
-
-```shell
-tinygo build -buildmode=c-shared -o add.wasm -target=wasip1 add.go
-```
-
-You can also use the same syntax as Go 1.24+:
-
-```shell
-GOARCH=wasip1 GOOS=wasm tinygo build -buildmode=c-shared -o add.wasm add.go
-```
-
 ## Installation

 See the [getting started instructions](https://tinygo.org/getting-started/) for information on how to install TinyGo, as well as how to run the TinyGo compiler using our Docker container.

-## Supported targets
+## Supported boards/targets

-### Embedded
+You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.

-You can compile TinyGo programs for over 94 different microcontroller boards.
+The following 91 microcontroller boards are currently supported:

-For more information, please see https://tinygo.org/docs/reference/microcontrollers/
+* [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
+* [Adafruit Circuit Playground Express](https://www.adafruit.com/product/3333)
+* [Adafruit CLUE](https://www.adafruit.com/product/4500)
+* [Adafruit Feather M0](https://www.adafruit.com/product/2772)
+* [Adafruit Feather M4](https://www.adafruit.com/product/3857)
+* [Adafruit Feather M4 CAN](https://www.adafruit.com/product/4759)
+* [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062)
+* [Adafruit Feather nRF52840 Sense](https://www.adafruit.com/product/4516)
+* [Adafruit Feather RP2040](https://www.adafruit.com/product/4884)
+* [Adafruit Feather STM32F405 Express](https://www.adafruit.com/product/4382)
+* [Adafruit Grand Central M4](https://www.adafruit.com/product/4064)
+* [Adafruit ItsyBitsy M0](https://www.adafruit.com/product/3727)
+* [Adafruit ItsyBitsy M4](https://www.adafruit.com/product/3800)
+* [Adafruit ItsyBitsy nRF52840](https://www.adafruit.com/product/4481)
+* [Adafruit MacroPad RP2040](https://www.adafruit.com/product/5100)
+* [Adafruit Matrix Portal M4](https://www.adafruit.com/product/4745)
+* [Adafruit Metro M4 Express Airlift](https://www.adafruit.com/product/4000)
+* [Adafruit PyBadge](https://www.adafruit.com/product/4200)
+* [Adafruit PyGamer](https://www.adafruit.com/product/4242)
+* [Adafruit PyPortal](https://www.adafruit.com/product/4116)
+* [Adafruit QT Py](https://www.adafruit.com/product/4600)
+* [Adafruit QT Py RP2040](https://www.adafruit.com/product/4900)
+* [Adafruit Trinket M0](https://www.adafruit.com/product/3500)
+* [Adafruit Trinkey QT2040](https://adafruit.com/product/5056)
+* [Arduino Mega 1280](https://www.arduino.cc/en/Main/arduinoBoardMega/)
+* [Arduino Mega 2560](https://store.arduino.cc/arduino-mega-2560-rev3)
+* [Arduino MKR1000](https://store.arduino.cc/arduino-mkr1000-wifi)
+* [Arduino MKR WiFi 1010](https://store.arduino.cc/usa/mkr-wifi-1010)
+* [Arduino Nano](https://store.arduino.cc/arduino-nano)
+* [Arduino Nano 33 BLE](https://store.arduino.cc/nano-33-ble)
+* [Arduino Nano 33 BLE Sense](https://store.arduino.cc/nano-33-ble-sense)
+* [Arduino Nano 33 IoT](https://store.arduino.cc/nano-33-iot)
+* [Arduino Nano RP2040 Connect](https://store.arduino.cc/nano-rp2040-connect)
+* [Arduino Uno](https://store.arduino.cc/arduino-uno-rev3)
+* [Arduino Zero](https://store.arduino.cc/usa/arduino-zero)
+* [BBC micro:bit](https://microbit.org/)
+* [BBC micro:bit v2](https://microbit.org/new-microbit/)
+* [blues wireless Swan](https://blues.io/products/swan/)
+* [Digispark](http://digistump.com/products/1)
+* [Dragino LoRaWAN GPS Tracker LGT-92](http://www.dragino.com/products/lora-lorawan-end-node/item/142-lgt-92.html)
+* [ESP32 - Core board](https://www.espressif.com/en/products/socs/esp32)
+* [ESP32 - mini32](https://www.espressif.com/en/products/socs/esp32)
+* [ESP32-C3-12f](https://www.espressif.com/en/products/socs/esp32-c3)
+* [ESP8266 - d1mini](https://www.espressif.com/en/products/socs/esp8266)
+* [ESP8266 - NodeMCU](https://www.espressif.com/en/products/socs/esp8266)
+* [Game Boy Advance](https://en.wikipedia.org/wiki/Game_Boy_Advance)
+* [iLabs Challenger RP2040 LoRa](https://ilabs.se/product/challenger-rp2040-lora/)
+* [M5Stack](https://docs.m5stack.com/en/core/basic)
+* [M5Stack Core2](https://shop.m5stack.com/products/m5stack-core2-esp32-iot-development-kit)
+* [M5Stamp C3](https://docs.m5stack.com/en/core/stamp_c3)
+* [Makerdiary nRF52840-MDK](https://wiki.makerdiary.com/nrf52840-mdk/)
+* [Makerdiary nRF52840-MDK USB Dongle](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/)
+* [MCH2022 badge](https://badge.team/docs/badges/mch2022/)
+* [Microchip SAM E54 Xplained Pro](https://www.microchip.com/developmenttools/productdetails/atsame54-xpro)
+* [nice!nano](https://docs.nicekeyboards.com/#/nice!nano/)
+* [Nintendo Switch](https://www.nintendo.com/switch/)
+* [Nordic Semiconductor PCA10031](https://www.nordicsemi.com/eng/Products/nRF51-Dongle)
+* [Nordic Semiconductor PCA10040](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52-DK)
+* [Nordic Semiconductor PCA10056](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK)
+* [Nordic Semiconductor pca10059](https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52840-Dongle)
+* [Particle Argon](https://docs.particle.io/datasheets/wi-fi/argon-datasheet/)
+* [Particle Boron](https://docs.particle.io/datasheets/cellular/boron-datasheet/)
+* [Particle Xenon](https://docs.particle.io/datasheets/discontinued/xenon-datasheet/)
+* [Phytec reel board](https://www.phytec.eu/product-eu/internet-of-things/reelboard/)
+* [Pimoroni Badger2040](https://shop.pimoroni.com/products/badger-2040)
+* [Pimoroni Tufty2040](https://shop.pimoroni.com/products/tufty-2040)
+* [PineTime DevKit](https://www.pine64.org/pinetime/)
+* [PJRC Teensy 3.6](https://www.pjrc.com/store/teensy36.html)
+* [PJRC Teensy 4.0](https://www.pjrc.com/store/teensy40.html)
+* [PJRC Teensy 4.1](https://www.pjrc.com/store/teensy41.html)
+* [ProductivityOpen P1AM-100](https://facts-engineering.github.io/modules/P1AM-100/P1AM-100.html)
+* [Raspberry Pi Pico](https://www.raspberrypi.org/products/raspberry-pi-pico/)
+* [Raytac MDBT50Q-RX Dongle (with TinyUF2 bootloader)](https://www.adafruit.com/product/5199)
+* [Seeed Seeeduino XIAO](https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html)
+* [Seeed XIAO BLE](https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html)
+* [Seeed XIAO ESP32C3](https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html)
+* [Seeed XIAO RP2040](https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html)
+* [Seeed LoRa-E5 Development Kit](https://www.seeedstudio.com/LoRa-E5-Dev-Kit-p-4868.html)
+* [Seeed Sipeed MAix BiT](https://www.seeedstudio.com/Sipeed-MAix-BiT-for-RISC-V-AI-IoT-p-2872.html)
+* [Seeed Wio Terminal](https://www.seeedstudio.com/Wio-Terminal-p-4509.html)
+* [SiFIve HiFive1 Rev B](https://www.sifive.com/boards/hifive1-rev-b)
+* [Sparkfun Thing Plus RP2040](https://www.sparkfun.com/products/17745)
+* [ST Micro "Nucleo" F103RB](https://www.st.com/en/evaluation-tools/nucleo-f103rb.html)
+* [ST Micro "Nucleo" F722ZE](https://www.st.com/en/evaluation-tools/nucleo-f722ze.html)
+* [ST Micro "Nucleo" L031K6](https://www.st.com/ja/evaluation-tools/nucleo-l031k6.html)
+* [ST Micro "Nucleo" L432KC](https://www.st.com/ja/evaluation-tools/nucleo-l432kc.html)
+* [ST Micro "Nucleo" L552ZE](https://www.st.com/en/evaluation-tools/nucleo-l552ze-q.html)
+* [ST Micro "Nucleo" WL55JC](https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html)
+* [ST Micro STM32F103XX "Bluepill"](https://stm32-base.org/boards/STM32F103C8T6-Blue-Pill)
+* [ST Micro STM32F407 "Discovery"](https://www.st.com/en/evaluation-tools/stm32f4discovery.html)
+* [ST Micro STM32F469 "Discovery"](https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/32f469idiscovery.html)
+* [X9 Pro smartwatch](https://github.com/curtpw/nRF5x-device-reverse-engineering/tree/master/X9-nrf52832-activity-tracker/)
+* [The Things Industries Generic Node Sensor Edition](https://www.genericnode.com/docs/sensor-edition/)

-### WebAssembly
-
-TinyGo programs can be compiled for both WASM and WASI targets.
-
-For more information, see https://tinygo.org/docs/guides/webassembly/
-
-### Operating Systems
-
-You can also compile programs for Linux, macOS, and Windows targets.
-
-For more information:
-
- Linux https://tinygo.org/docs/guides/linux/
-
- macOS https://tinygo.org/docs/guides/macos/
-
- Windows https://tinygo.org/docs/guides/windows/
+For more information, see [this list of boards](https://tinygo.org/microcontrollers/). Pull requests for additional support are welcome!

 ## Currently supported features:

@@ -3,7 +3,6 @@ package builder
 import (
 	"bytes"
 	"debug/elf"
-	"debug/macho"
 	"debug/pe"
 	"encoding/binary"
 	"errors"
@@ -13,11 +12,10 @@ import (
 	"path/filepath"
 	"time"

-	wasm "github.com/aykevl/go-wasm"
 	"github.com/blakesmith/ar"
 )

-// makeArchive creates an archive for static linking from a list of object files
+// makeArchive creates an arcive for static linking from a list of object files
 // given as a parameter. It is equivalent to the following command:
 //
 //	ar -rcs <archivePath> <objs...>
@@ -63,20 +61,6 @@ func makeArchive(arfile *os.File, objs []string) error {
 					fileIndex int
 				}{symbol.Name, i})
 			}
-		} else if dbg, err := macho.NewFile(objfile); err == nil {
-			for _, symbol := range dbg.Symtab.Syms {
-				// See mach-o/nlist.h
-				if symbol.Type&0x0e != 0xe { // (symbol.Type & N_TYPE) != N_SECT
-					continue // undefined symbol
-				}
-				if symbol.Type&0x01 == 0 { // (symbol.Type & N_EXT) == 0
-					continue // internal symbol (static, etc)
-				}
-				symbolTable = append(symbolTable, struct {
-					name      string
-					fileIndex int
-				}{symbol.Name, i})
-			}
 		} else if dbg, err := pe.NewFile(objfile); err == nil {
 			for _, symbol := range dbg.Symbols {
 				if symbol.StorageClass != 2 {
@@ -90,35 +74,8 @@ func makeArchive(arfile *os.File, objs []string) error {
 					fileIndex int
 				}{symbol.Name, i})
 			}
-		} else if dbg, err := wasm.Parse(objfile); err == nil {
-			for _, s := range dbg.Sections {
-				switch section := s.(type) {
-				case *wasm.SectionLinking:
-					for _, symbol := range section.Symbols {
-						if symbol.Flags&wasm.LinkingSymbolFlagUndefined != 0 {
-							// Don't list undefined functions.
-							continue
-						}
-						if symbol.Flags&wasm.LinkingSymbolFlagBindingLocal != 0 {
-							// Don't include local symbols.
-							continue
-						}
-						if symbol.Kind != wasm.LinkingSymbolKindFunction && symbol.Kind != wasm.LinkingSymbolKindData {
-							// Link functions and data symbols.
-							// Some data symbols need to be included, such as
-							// __log_data.
-							continue
-						}
-						// Include in the archive.
-						symbolTable = append(symbolTable, struct {
-							name      string
-							fileIndex int
-						}{symbol.Name, i})
-					}
-				}
-			}
 		} else {
-			return fmt.Errorf("failed to open file %s as WASM, ELF or PE/COFF: %w", objpath, err)
+			return fmt.Errorf("failed to open file %s as ELF or PE/COFF: %w", objpath, err)
 		}

 		// Close file, to avoid issues with too many open files (especially on
@@ -165,7 +122,7 @@ func makeArchive(arfile *os.File, objs []string) error {
 	}

 	// Keep track of the start of the symbol table.
-	symbolTableStart, err := arfile.Seek(0, io.SeekCurrent)
+	symbolTableStart, err := arfile.Seek(0, os.SEEK_CUR)
 	if err != nil {
 		return err
 	}
@@ -187,7 +144,7 @@ func makeArchive(arfile *os.File, objs []string) error {

 		// Store the start index, for when we'll update the symbol table with
 		// the correct file start indices.
-		offset, err := arfile.Seek(0, io.SeekCurrent)
+		offset, err := arfile.Seek(0, os.SEEK_CUR)
 		if err != nil {
 			return err
 		}
@@ -1,86 +0,0 @@
-package builder
-
-// The well-known conservative Boehm-Demers-Weiser GC.
-// This file provides a way to compile this GC for use with TinyGo.
-
-import (
-	"path/filepath"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var BoehmGC = Library{
-	name: "bdwgc",
-	cflags: func(target, headerPath string) []string {
-		libdir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
-		return []string{
-			// use a modern environment
-			"-DUSE_MMAP",              // mmap is available
-			"-DUSE_MUNMAP",            // return memory to the OS using munmap
-			"-DGC_BUILTIN_ATOMIC",     // use compiler intrinsics for atomic operations
-			"-DNO_EXECUTE_PERMISSION", // don't make the heap executable
-
-			// specific flags for TinyGo
-			"-DALL_INTERIOR_POINTERS",  // scan interior pointers (needed for Go)
-			"-DIGNORE_DYNAMIC_LOADING", // we don't support dynamic loading at the moment
-			"-DNO_GETCONTEXT",          // musl doesn't support getcontext()
-			"-DGC_DISABLE_INCREMENTAL", // don't mess with SIGSEGV and such
-
-			// Use a minimal environment.
-			"-DNO_MSGBOX_ON_ERROR", // don't call MessageBoxA on Windows
-			"-DDONT_USE_ATEXIT",
-
-			// Special flag to work around the lack of __data_start in ld.lld.
-			// TODO: try to fix this in LLVM/lld directly so we don't have to
-			// work around it anymore.
-			"-DGC_DONT_REGISTER_MAIN_STATIC_DATA",
-
-			// Do not scan the stack. We have our own mechanism to do this.
-			"-DSTACK_NOT_SCANNED",
-
-			// Assertions can be enabled while debugging GC issues.
-			//"-DGC_ASSERTIONS",
-
-			// We use our own way of dealing with threads (that is a bit hacky).
-			// See src/runtime/gc_boehm.go.
-			//"-DGC_THREADS",
-			//"-DTHREAD_LOCAL_ALLOC",
-
-			"-I" + libdir + "/include",
-		}
-	},
-	needsLibc: true,
-	sourceDir: func() string {
-		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
-	},
-	librarySources: func(target string) ([]string, error) {
-		sources := []string{
-			"allchblk.c",
-			"alloc.c",
-			"blacklst.c",
-			"dbg_mlc.c",
-			"dyn_load.c",
-			"finalize.c",
-			"headers.c",
-			"mach_dep.c",
-			"malloc.c",
-			"mark.c",
-			"mark_rts.c",
-			"misc.c",
-			"new_hblk.c",
-			"obj_map.c",
-			"os_dep.c",
-			"reclaim.c",
-		}
-		if strings.Split(target, "-")[2] == "windows" {
-			// Due to how the linker on Windows works (that doesn't allow
-			// undefined functions), we need to include these extra files.
-			sources = append(sources,
-				"mallocx.c",
-				"ptr_chck.c",
-			)
-		}
-		return sources, nil
-	},
-}
@@ -8,6 +8,7 @@ import (
 	"testing"

 	"github.com/tinygo-org/tinygo/compileopts"
+	"github.com/tinygo-org/tinygo/goenv"
 	"tinygo.org/x/go-llvm"
 )

@@ -33,11 +34,8 @@ func TestClangAttributes(t *testing.T) {
 		"k210",
 		"nintendoswitch",
 		"riscv-qemu",
-		"tkey",
-		"wasip1",
-		"wasip2",
+		"wasi",
 		"wasm",
-		"wasm-unknown",
 	}
 	if hasBuiltinTools {
 		// hasBuiltinTools is set when TinyGo is statically linked with LLVM,
@@ -54,29 +52,18 @@ func TestClangAttributes(t *testing.T) {
 	for _, options := range []*compileopts.Options{
 		{GOOS: "linux", GOARCH: "386"},
 		{GOOS: "linux", GOARCH: "amd64"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "5,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "6,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "7,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "5,hardfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "6,hardfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "7,hardfloat"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "5"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "6"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "7"},
 		{GOOS: "linux", GOARCH: "arm64"},
-		{GOOS: "linux", GOARCH: "mips", GOMIPS: "hardfloat"},
-		{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "hardfloat"},
-		{GOOS: "linux", GOARCH: "mips", GOMIPS: "softfloat"},
-		{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "softfloat"},
 		{GOOS: "darwin", GOARCH: "amd64"},
 		{GOOS: "darwin", GOARCH: "arm64"},
 		{GOOS: "windows", GOARCH: "amd64"},
-		{GOOS: "windows", GOARCH: "arm64"},
 	} {
 		name := "GOOS=" + options.GOOS + ",GOARCH=" + options.GOARCH
 		if options.GOARCH == "arm" {
 			name += ",GOARM=" + options.GOARM
 		}
-		if options.GOARCH == "mips" || options.GOARCH == "mipsle" {
-			name += ",GOMIPS=" + options.GOMIPS
-		}
 		t.Run(name, func(t *testing.T) {
 			testClangAttributes(t, options)
 		})
@@ -85,6 +72,7 @@ func TestClangAttributes(t *testing.T) {

 func testClangAttributes(t *testing.T, options *compileopts.Options) {
 	testDir := t.TempDir()
+	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))

 	ctx := llvm.NewContext()
 	defer ctx.Dispose()
@@ -94,8 +82,9 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 		t.Fatalf("could not load target: %s", err)
 	}
 	config := compileopts.Config{
-		Options: options,
-		Target:  target,
+		Options:      options,
+		Target:       target,
+		ClangHeaders: clangHeaderPath,
 	}

 	// Create a very simple C input file.
@@ -107,7 +96,7 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {

 	// Compile this file using Clang.
 	outpath := filepath.Join(testDir, "test.bc")
-	flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags(false)...)
+	flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags()...)
 	if config.GOOS() == "darwin" {
 		// Silence some warnings that happen when testing GOOS=darwin on
 		// something other than MacOS.
@@ -77,15 +77,6 @@ func ReadBuildID() ([]byte, error) {
 			}
 			return raw[4:], nil
 		}
-
-		// Normally we would have found a build ID by now. But not on Nix,
-		// unfortunately, because Nix adds -no_uuid for some reason:
-		// https://github.com/NixOS/nixpkgs/issues/178366
-		// Fall back to the same implementation that we use for Windows.
-		id, err := readRawGoBuildID(f, 32*1024)
-		if len(id) != 0 || err != nil {
-			return id, err
-		}
 	default:
 		// On other platforms (such as Windows) there isn't such a convenient
 		// build ID. Luckily, Go does have an equivalent of the build ID, which
@@ -97,31 +88,16 @@ func ReadBuildID() ([]byte, error) {
 		// directly. Luckily the build ID is always at the start of the file.
 		// For details, see:
 		// https://github.com/golang/go/blob/master/src/cmd/internal/buildid/buildid.go
-		id, err := readRawGoBuildID(f, 4096)
-		if len(id) != 0 || err != nil {
-			return id, err
+		fileStart := make([]byte, 4096)
+		_, err := io.ReadFull(f, fileStart)
+		index := bytes.Index(fileStart, []byte("\xff Go build ID: \""))
+		if index < 0 || index > len(fileStart)-103 {
+			return nil, fmt.Errorf("could not find build id in %s", err)
+		}
+		buf := fileStart[index : index+103]
+		if bytes.HasPrefix(buf, []byte("\xff Go build ID: \"")) && bytes.HasSuffix(buf, []byte("\"\n \xff")) {
+			return buf[len("\xff Go build ID: \"") : len(buf)-1], nil
 		}
 	}
-	return nil, fmt.Errorf("could not find build ID in %v", executable)
-}
-
-// The Go toolchain stores a build ID in the binary that we can use, as a
-// fallback if binary file specific build IDs can't be obtained.
-// This function reads that build ID from the binary.
-func readRawGoBuildID(f *os.File, prefixSize int) ([]byte, error) {
-	fileStart := make([]byte, prefixSize)
-	_, err := io.ReadFull(f, fileStart)
-	if err != nil {
-		return nil, fmt.Errorf("could not read build id from %s: %v", f.Name(), err)
-	}
-	index := bytes.Index(fileStart, []byte("\xff Go build ID: \""))
-	if index < 0 || index > len(fileStart)-103 {
-		return nil, fmt.Errorf("could not find build id in %s", f.Name())
-	}
-	buf := fileStart[index : index+103]
-	if bytes.HasPrefix(buf, []byte("\xff Go build ID: \"")) && bytes.HasSuffix(buf, []byte("\"\n \xff")) {
-		return buf[len("\xff Go build ID: \"") : len(buf)-1], nil
-	}
-
-	return nil, nil
+	return nil, fmt.Errorf("could not find build ID in %s", executable)
 }
@@ -3,19 +3,19 @@ package builder
 import (
 	"os"
 	"path/filepath"
+	"strings"

-	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
 )

-// These are the GENERIC_SOURCES according to CMakeList.txt except for
-// divmodsi4.c and udivmodsi4.c.
+// These are the GENERIC_SOURCES according to CMakeList.txt.
 var genericBuiltins = []string{
 	"absvdi2.c",
 	"absvsi2.c",
 	"absvti2.c",
 	"adddf3.c",
 	"addsf3.c",
+	"addtf3.c",
 	"addvdi3.c",
 	"addvsi3.c",
 	"addvti3.c",
@@ -40,12 +40,12 @@ var genericBuiltins = []string{
 	"divdf3.c",
 	"divdi3.c",
 	"divmoddi4.c",
-	//"divmodsi4.c",
-	"divmodti4.c",
 	"divsc3.c",
 	"divsf3.c",
 	"divsi3.c",
+	"divtc3.c",
 	"divti3.c",
+	"divtf3.c",
 	"extendsfdf2.c",
 	"extendhfsf2.c",
 	"ffsdi2.c",
@@ -91,6 +91,7 @@ var genericBuiltins = []string{
 	"mulsc3.c",
 	"mulsf3.c",
 	"multi3.c",
+	"multf3.c",
 	"mulvdi3.c",
 	"mulvsi3.c",
 	"mulvti3.c",
@@ -110,11 +111,13 @@ var genericBuiltins = []string{
 	"popcountti2.c",
 	"powidf2.c",
 	"powisf2.c",
+	"powitf2.c",
 	"subdf3.c",
 	"subsf3.c",
 	"subvdi3.c",
 	"subvsi3.c",
 	"subvti3.c",
+	"subtf3.c",
 	"trampoline_setup.c",
 	"truncdfhf2.c",
 	"truncdfsf2.c",
@@ -123,7 +126,6 @@ var genericBuiltins = []string{
 	"ucmpti2.c",
 	"udivdi3.c",
 	"udivmoddi4.c",
-	//"udivmodsi4.c",
 	"udivmodti4.c",
 	"udivsi3.c",
 	"udivti3.c",
@@ -132,38 +134,6 @@ var genericBuiltins = []string{
 	"umodti3.c",
 }

-// These are the GENERIC_TF_SOURCES as of LLVM 18.
-// They are not needed on all platforms (32-bit platforms usually don't need
-// these) but they seem to compile fine so it's easier to include them.
-var genericBuiltins128 = []string{
-	"addtf3.c",
-	"comparetf2.c",
-	"divtc3.c",
-	"divtf3.c",
-	"extenddftf2.c",
-	"extendhftf2.c",
-	"extendsftf2.c",
-	"fixtfdi.c",
-	"fixtfsi.c",
-	"fixtfti.c",
-	"fixunstfdi.c",
-	"fixunstfsi.c",
-	"fixunstfti.c",
-	"floatditf.c",
-	"floatsitf.c",
-	"floattitf.c",
-	"floatunditf.c",
-	"floatunsitf.c",
-	"floatuntitf.c",
-	"multc3.c",
-	"multf3.c",
-	"powitf2.c",
-	"subtf3.c",
-	"trunctfdf2.c",
-	"trunctfhf2.c",
-	"trunctfsf2.c",
-}
-
 var aeabiBuiltins = []string{
 	"arm/aeabi_cdcmp.S",
 	"arm/aeabi_cdcmpeq_check_nan.c",
@@ -192,21 +162,12 @@ var aeabiBuiltins = []string{
 	"udivmodsi4.c",
 }

-var avrBuiltins = []string{
-	"avr/divmodhi4.S",
-	"avr/divmodqi4.S",
-	"avr/mulhi3.S",
-	"avr/mulqi3.S",
-	"avr/udivmodhi4.S",
-	"avr/udivmodqi4.S",
-}
-
-// libCompilerRT is a library with symbols required by programs compiled with
-// LLVM. These symbols are for operations that cannot be emitted with a single
+// CompilerRT is a library with symbols required by programs compiled with LLVM.
+// These symbols are for operations that cannot be emitted with a single
 // instruction or a short sequence of instructions for that target.
 //
 // For more information, see: https://compiler-rt.llvm.org/
-var libCompilerRT = Library{
+var CompilerRT = Library{
 	name: "compiler-rt",
 	cflags: func(target, headerPath string) []string {
 		return []string{"-Werror", "-Wall", "-std=c11", "-nostdlibinc"}
@@ -220,16 +181,11 @@ var libCompilerRT = Library{
 		// Development build.
 		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/compiler-rt-builtins")
 	},
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string) []string {
 		builtins := append([]string{}, genericBuiltins...) // copy genericBuiltins
-		switch compileopts.CanonicalArchName(target) {
-		case "arm":
+		if strings.HasPrefix(target, "arm") || strings.HasPrefix(target, "thumb") {
 			builtins = append(builtins, aeabiBuiltins...)
-		case "avr":
-			builtins = append(builtins, avrBuiltins...)
-		case "x86_64", "aarch64", "riscv64": // any 64-bit arch
-			builtins = append(builtins, genericBuiltins128...)
 		}
-		return builtins, nil
+		return builtins
 	},
 }
@@ -56,7 +56,7 @@ import (
 //     depfile but without invalidating its name. For this reason, the depfile is
 //     written on each new compilation (even when it seems unnecessary). However, it
 //     could in rare cases lead to a stale file fetched from the cache.
-func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands func(string, ...string)) (string, error) {
+func compileAndCacheCFile(abspath, tmpdir string, cflags []string, thinlto bool, printCommands func(string, ...string)) (string, error) {
 	// Hash input file.
 	fileHash, err := hashFile(abspath)
 	if err != nil {
@@ -67,6 +67,11 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 	unlock := lock(filepath.Join(goenv.Get("GOCACHE"), fileHash+".c.lock"))
 	defer unlock()

+	ext := ".o"
+	if thinlto {
+		ext = ".bc"
+	}
+
 	// Create cache key for the dependencies file.
 	buf, err := json.Marshal(struct {
 		Path        string
@@ -99,7 +104,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		}

 		// Obtain hashes of all the files listed as a dependency.
-		outpath, err := makeCFileCachePath(dependencies, depfileNameHash)
+		outpath, err := makeCFileCachePath(dependencies, depfileNameHash, ext)
 		if err == nil {
 			if _, err := os.Stat(outpath); err == nil {
 				return outpath, nil
@@ -112,7 +117,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		return "", err
 	}

-	objTmpFile, err := os.CreateTemp(goenv.Get("GOCACHE"), "tmp-*.bc")
+	objTmpFile, err := os.CreateTemp(goenv.Get("GOCACHE"), "tmp-*"+ext)
 	if err != nil {
 		return "", err
 	}
@@ -122,8 +127,11 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		return "", err
 	}
 	depTmpFile.Close()
-	flags := append([]string{}, cflags...)                                                 // copy cflags
-	flags = append(flags, "-MD", "-MV", "-MTdeps", "-MF", depTmpFile.Name(), "-flto=thin") // autogenerate dependencies
+	flags := append([]string{}, cflags...)                                   // copy cflags
+	flags = append(flags, "-MD", "-MV", "-MTdeps", "-MF", depTmpFile.Name()) // autogenerate dependencies
+	if thinlto {
+		flags = append(flags, "-flto=thin")
+	}
 	flags = append(flags, "-c", "-o", objTmpFile.Name(), abspath)
 	if strings.ToLower(filepath.Ext(abspath)) == ".s" {
 		// If this is an assembly file (.s or .S, lowercase or uppercase), then
@@ -181,7 +189,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 	}

 	// Move temporary object file to final location.
-	outpath, err := makeCFileCachePath(dependencySlice, depfileNameHash)
+	outpath, err := makeCFileCachePath(dependencySlice, depfileNameHash, ext)
 	if err != nil {
 		return "", err
 	}
@@ -196,7 +204,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 // Create a cache path (a path in GOCACHE) to store the output of a compiler
 // job. This path is based on the dep file name (which is a hash of metadata
 // including compiler flags) and the hash of all input files in the paths slice.
-func makeCFileCachePath(paths []string, depfileNameHash string) (string, error) {
+func makeCFileCachePath(paths []string, depfileNameHash, ext string) (string, error) {
 	// Hash all input files.
 	fileHashes := make(map[string]string, len(paths))
 	for _, path := range paths {
@@ -221,7 +229,7 @@ func makeCFileCachePath(paths []string, depfileNameHash string) (string, error)
 	outFileNameBuf := sha512.Sum512_224(buf)
 	cacheKey := hex.EncodeToString(outFileNameBuf[:])

-	outpath := filepath.Join(goenv.Get("GOCACHE"), "obj-"+cacheKey+".bc")
+	outpath := filepath.Join(goenv.Get("GOCACHE"), "obj-"+cacheKey+ext)
 	return outpath, nil
 }

@@ -1,11 +1,4 @@
-//go:build byollvm
-
-// Source: https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/cc1as_main.cpp
-// This file needs to be updated each LLVM release.
-// There are a few small modifications to make, like:
-//   * ExecuteAssembler is made non-static.
-//   * The struct AssemblerImplementation is moved to cc1as.h so it can be
-//     included elsewhere.
+// +build byollvm

 //===-- cc1as.cpp - Clang Assembler  --------------------------------------===//
 //
@@ -28,8 +21,8 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
@@ -53,6 +46,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
@@ -61,10 +55,7 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/TargetParser/Host.h"
-#include "llvm/TargetParser/Triple.h"
 #include <memory>
-#include <optional>
 #include <system_error>
 using namespace clang;
 using namespace clang::driver;
@@ -82,10 +73,10 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  // Parse the arguments.
  const OptTable &OptTbl = getDriverOptTable();

-  llvm::opt::Visibility VisibilityMask(options::CC1AsOption);
+  const unsigned IncludedFlagsBitmask = options::CC1AsOption;
  unsigned MissingArgIndex, MissingArgCount;
-  InputArgList Args =
-      OptTbl.ParseArgs(Argv, MissingArgIndex, MissingArgCount, VisibilityMask);
+  InputArgList Args = OptTbl.ParseArgs(Argv, MissingArgIndex, MissingArgCount,
+                                       IncludedFlagsBitmask);

  // Check for missing argument error.
  if (MissingArgCount) {
@@ -98,7 +89,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
    auto ArgString = A->getAsString(Args);
    std::string Nearest;
-    if (OptTbl.findNearest(ArgString, Nearest, VisibilityMask) > 1)
+    if (OptTbl.findNearest(ArgString, Nearest, IncludedFlagsBitmask) > 1)
      Diags.Report(diag::err_drv_unknown_argument) << ArgString;
    else
      Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
@@ -110,17 +101,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,

  // Target Options
  Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
-  if (Arg *A = Args.getLastArg(options::OPT_darwin_target_variant_triple))
-    Opts.DarwinTargetVariantTriple = llvm::Triple(A->getValue());
-  if (Arg *A = Args.getLastArg(OPT_darwin_target_variant_sdk_version_EQ)) {
-    VersionTuple Version;
-    if (Version.tryParse(A->getValue()))
-      Diags.Report(diag::err_drv_invalid_value)
-          << A->getAsString(Args) << A->getValue();
-    else
-      Opts.DarwinTargetVariantSDKVersion = Version;
-  }
-
  Opts.CPU = std::string(Args.getLastArgValue(OPT_target_cpu));
  Opts.Features = Args.getAllArgValues(OPT_target_feature);

@@ -139,13 +119,11 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
    Opts.CompressDebugSections =
        llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
            .Case("none", llvm::DebugCompressionType::None)
-            .Case("zlib", llvm::DebugCompressionType::Zlib)
-            .Case("zstd", llvm::DebugCompressionType::Zstd)
+            .Case("zlib", llvm::DebugCompressionType::Z)
            .Default(llvm::DebugCompressionType::None);
  }

-  Opts.RelaxELFRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
-  Opts.SSE2AVX = Args.hasArg(OPT_msse2avx);
+  Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
  if (auto *DwarfFormatArg = Args.getLastArg(OPT_gdwarf64, OPT_gdwarf32))
    Opts.Dwarf64 = DwarfFormatArg->getOption().matches(OPT_gdwarf64);
  Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
@@ -160,7 +138,8 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,

  for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ)) {
    auto Split = StringRef(Arg).split('=');
-    Opts.DebugPrefixMap.emplace_back(Split.first, Split.second);
+    Opts.DebugPrefixMap.insert(
+        {std::string(Split.first), std::string(Split.second)});
  }

  // Frontend Options
@@ -207,7 +186,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
  Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
  Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
-  Opts.NoTypeCheck = Args.hasArg(OPT_mno_type_check);
  Opts.RelocationModel =
      std::string(Args.getLastArgValue(OPT_mrelocation_model, "pic"));
  Opts.TargetABI = std::string(Args.getLastArgValue(OPT_target_abi));
@@ -225,20 +203,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
                            .Default(0);
  }

-  if (auto *A = Args.getLastArg(OPT_femit_dwarf_unwind_EQ)) {
-    Opts.EmitDwarfUnwind =
-        llvm::StringSwitch<EmitDwarfUnwindType>(A->getValue())
-            .Case("always", EmitDwarfUnwindType::Always)
-            .Case("no-compact-unwind", EmitDwarfUnwindType::NoCompactUnwind)
-            .Case("default", EmitDwarfUnwindType::Default);
-  }
-
-  Opts.EmitCompactUnwindNonCanonical =
-      Args.hasArg(OPT_femit_compact_unwind_non_canonical);
-  Opts.Crel = Args.hasArg(OPT_crel);
-
-  Opts.AsSecureLogFile = Args.getLastArgValue(OPT_as_secure_log_file);
-
  return Success;
 }

@@ -272,8 +236,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
      MemoryBuffer::getFileOrSTDIN(Opts.InputFile, /*IsText=*/true);

  if (std::error_code EC = Buffer.getError()) {
-    return Diags.Report(diag::err_fe_error_reading)
-           << Opts.InputFile << EC.message();
+    Error = EC.message();
+    return Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
  }

  SourceMgr SrcMgr;
@@ -289,23 +253,15 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  assert(MRI && "Unable to create target register info!");

  MCTargetOptions MCOptions;
-  MCOptions.MCRelaxAll = Opts.RelaxAll;
-  MCOptions.EmitDwarfUnwind = Opts.EmitDwarfUnwind;
-  MCOptions.EmitCompactUnwindNonCanonical = Opts.EmitCompactUnwindNonCanonical;
-  MCOptions.MCSaveTempLabels = Opts.SaveTemporaryLabels;
-  MCOptions.Crel = Opts.Crel;
-  MCOptions.X86RelaxRelocations = Opts.RelaxELFRelocations;
-  MCOptions.X86Sse2Avx = Opts.SSE2AVX;
-  MCOptions.CompressDebugSections = Opts.CompressDebugSections;
-  MCOptions.AsSecureLogFile = Opts.AsSecureLogFile;
-
  std::unique_ptr<MCAsmInfo> MAI(
      TheTarget->createMCAsmInfo(*MRI, Opts.Triple, MCOptions));
  assert(MAI && "Unable to create target asm info!");

  // Ensure MCAsmInfo initialization occurs before any use, otherwise sections
  // may be created with a combination of default and explicit settings.
+  MAI->setCompressDebugSections(Opts.CompressDebugSections);

+  MAI->setRelaxELFRelocations(Opts.RelaxELFRelocations);

  bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
  if (Opts.OutputPath.empty())
@@ -343,12 +299,10 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
  std::unique_ptr<MCObjectFileInfo> MOFI(
      TheTarget->createMCObjectFileInfo(Ctx, PIC));
-  if (Opts.DarwinTargetVariantTriple)
-    MOFI->setDarwinTargetVariantTriple(*Opts.DarwinTargetVariantTriple);
-  if (!Opts.DarwinTargetVariantSDKVersion.empty())
-    MOFI->setDarwinTargetVariantSDKVersion(Opts.DarwinTargetVariantSDKVersion);
  Ctx.setObjectFileInfo(MOFI.get());

+  if (Opts.SaveTemporaryLabels)
+    Ctx.setAllowTemporaryLabels(false);
  if (Opts.GenDwarfForAssembly)
    Ctx.setGenDwarfForAssembly(true);
  if (!Opts.DwarfDebugFlags.empty())
@@ -384,10 +338,6 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

  MCOptions.MCNoWarn = Opts.NoWarn;
  MCOptions.MCFatalWarnings = Opts.FatalWarnings;
-  MCOptions.MCNoTypeCheck = Opts.NoTypeCheck;
-  MCOptions.ShowMCInst = Opts.ShowInst;
-  MCOptions.AsmVerbose = true;
-  MCOptions.MCUseDwarfDirectory = MCTargetOptions::EnableDwarfDirectory;
  MCOptions.ABIName = Opts.TargetABI;

  // FIXME: There is a bit of code duplication with addPassesToEmitFile.
@@ -397,13 +347,15 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

    std::unique_ptr<MCCodeEmitter> CE;
    if (Opts.ShowEncoding)
-      CE.reset(TheTarget->createMCCodeEmitter(*MCII, Ctx));
+      CE.reset(TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx));
    std::unique_ptr<MCAsmBackend> MAB(
        TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));

    auto FOut = std::make_unique<formatted_raw_ostream>(*Out);
-    Str.reset(TheTarget->createAsmStreamer(Ctx, std::move(FOut), IP,
-                                           std::move(CE), std::move(MAB)));
+    Str.reset(TheTarget->createAsmStreamer(
+        Ctx, std::move(FOut), /*asmverbose*/ true,
+        /*useDwarfDirectory*/ true, IP, std::move(CE), std::move(MAB),
+        Opts.ShowInst));
  } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
    Str.reset(createNullStreamer(Ctx));
  } else {
@@ -415,7 +367,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
    }

    std::unique_ptr<MCCodeEmitter> CE(
-        TheTarget->createMCCodeEmitter(*MCII, Ctx));
+        TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx));
    std::unique_ptr<MCAsmBackend> MAB(
        TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
    assert(MAB && "Unable to create asm backend!");
@@ -426,7 +378,9 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

    Triple T(Opts.Triple);
    Str.reset(TheTarget->createMCObjectStreamer(
-        T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI));
+        T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI,
+        Opts.RelaxAll, Opts.IncrementalLinkerCompatible,
+        /*DWARFMustBeAtTheEnd*/ true));
    Str.get()->initSections(Opts.NoExecStack, *STI);
  }

@@ -435,10 +389,13 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
  if (Opts.EmbedBitcode && Ctx.getObjectFileType() == MCContext::IsMachO) {
    MCSection *AsmLabel = Ctx.getMachOSection(
        "__LLVM", "__asm", MachO::S_REGULAR, 4, SectionKind::getReadOnly());
-    Str.get()->switchSection(AsmLabel);
+    Str.get()->SwitchSection(AsmLabel);
    Str.get()->emitZeros(1);
  }

+  // Assembly to object compilation should leverage assembly info.
+  Str->setUseAssemblerInfoForParsing(true);
+
  bool Failed = false;

  std::unique_ptr<MCAsmParser> Parser(
@@ -521,10 +478,9 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
  if (Asm.ShowHelp) {
    getDriverOptTable().printHelp(
        llvm::outs(), "clang -cc1as [options] file...",
-        "Clang Integrated Assembler", /*ShowHidden=*/false,
-        /*ShowAllAliases=*/false,
-        llvm::opt::Visibility(driver::options::CC1AsOption));
-
+        "Clang Integrated Assembler",
+        /*Include=*/driver::options::CC1AsOption, /*Exclude=*/0,
+        /*ShowAllAliases=*/false);
    return 0;
  }

@@ -1,6 +1,3 @@
-// Source: https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/cc1as_main.cpp
-// See cc1as.cpp for details.
-
 //===-- cc1as.h - Clang Assembler  ----------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -38,23 +35,16 @@ struct AssemblerInvocation {
  /// @{

  std::vector<std::string> IncludePaths;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned NoInitialTextSection : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned SaveTemporaryLabels : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned GenDwarfForAssembly : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned RelaxELFRelocations : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned SSE2AVX : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned Dwarf64 : 1;
  unsigned DwarfVersion;
  std::string DwarfDebugFlags;
  std::string DwarfDebugProducer;
  std::string DebugCompilationDir;
-  llvm::SmallVector<std::pair<std::string, std::string>, 0> DebugPrefixMap;
+  std::map<const std::string, const std::string> DebugPrefixMap;
  llvm::DebugCompressionType CompressDebugSections =
      llvm::DebugCompressionType::None;
  std::string MainFileName;
@@ -73,9 +63,7 @@ struct AssemblerInvocation {
    FT_Obj   ///< Object file output.
  };
  FileType OutputType;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned ShowHelp : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned ShowVersion : 1;

  /// @}
@@ -83,41 +71,20 @@ struct AssemblerInvocation {
  /// @{

  unsigned OutputAsmVariant;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned ShowEncoding : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned ShowInst : 1;

  /// @}
  /// @name Assembler Options
  /// @{

-  LLVM_PREFERRED_TYPE(bool)
  unsigned RelaxAll : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned NoExecStack : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned FatalWarnings : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned NoWarn : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned NoTypeCheck : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned IncrementalLinkerCompatible : 1;
-  LLVM_PREFERRED_TYPE(bool)
  unsigned EmbedBitcode : 1;

-  /// Whether to emit DWARF unwind info.
-  EmitDwarfUnwindType EmitDwarfUnwind;
-
-  // Whether to emit compact-unwind for non-canonical entries.
-  // Note: maybe overriden by other constraints.
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned EmitCompactUnwindNonCanonical : 1;
-
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned Crel : 1;
-
  /// The name of the relocation model to use.
  std::string RelocationModel;

@@ -125,16 +92,6 @@ struct AssemblerInvocation {
  /// otherwise.
  std::string TargetABI;

-  /// Darwin target variant triple, the variant of the deployment target
-  /// for which the code is being compiled.
-  std::optional<llvm::Triple> DarwinTargetVariantTriple;
-
-  /// The version of the darwin target variant SDK which was used during the
-  /// compilation
-  llvm::VersionTuple DarwinTargetVariantSDKVersion;
-
-  /// The name of a file to use with \c .secure_log_unique directives.
-  std::string AsSecureLogFile;
  /// @}

 public:
@@ -148,18 +105,13 @@ public:
    ShowInst = 0;
    ShowEncoding = 0;
    RelaxAll = 0;
-    SSE2AVX = 0;
    NoExecStack = 0;
    FatalWarnings = 0;
    NoWarn = 0;
-    NoTypeCheck = 0;
    IncrementalLinkerCompatible = 0;
    Dwarf64 = 0;
    DwarfVersion = 0;
    EmbedBitcode = 0;
-    EmitDwarfUnwind = EmitDwarfUnwindType::Default;
-    EmitCompactUnwindNonCanonical = false;
-    Crel = false;
  }

  static bool CreateFromArgs(AssemblerInvocation &Res,
@@ -1,4 +1,4 @@
-//go:build byollvm
+// +build byollvm

 #include <clang/Basic/DiagnosticOptions.h>
 #include <clang/CodeGen/CodeGenAction.h>
@@ -11,7 +11,7 @@
 #include <clang/FrontendTool/Utils.h>
 #include <llvm/ADT/IntrusiveRefCntPtr.h>
 #include <llvm/Option/Option.h>
-#include <llvm/TargetParser/Host.h>
+#include <llvm/Support/Host.h>

 using namespace llvm;
 using namespace clang;
@@ -3,6 +3,7 @@ package builder
 import (
 	"errors"
 	"fmt"
+	"os"
 	"os/exec"
 	"runtime"
 	"strings"
@@ -75,3 +76,14 @@ func LookupCommand(name string) (string, error) {
 	}
 	return "", errors.New("none of these commands were found in your $PATH: " + strings.Join(commands[name], " "))
 }
+
+func execCommand(name string, args ...string) error {
+	name, err := LookupCommand(name)
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command(name, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}
@@ -1,8 +1,8 @@
 package builder

 import (
+	"errors"
 	"fmt"
-	"runtime"

 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
@@ -24,37 +24,26 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 		spec.OpenOCDCommands = options.OpenOCDCommands
 	}

-	// Version range supported by TinyGo.
-	const minorMin = 19
-	const minorMax = 24
-
-	// Check that we support this Go toolchain version.
-	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()
-	if err != nil {
-		return nil, err
-	}
-	if gorootMajor != 1 || gorootMinor < minorMin || gorootMinor > minorMax {
-		// Note: when this gets updated, also update the Go compatibility matrix:
-		// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
-		return nil, fmt.Errorf("requires go version 1.%d through 1.%d, got go%d.%d", minorMin, minorMax, gorootMajor, gorootMinor)
+	goroot := goenv.Get("GOROOT")
+	if goroot == "" {
+		return nil, errors.New("cannot locate $GOROOT, please set it manually")
 	}

-	// Check that the Go toolchain version isn't too new, if we haven't been
-	// compiled with the latest Go version.
-	// This may be a bit too aggressive: if the newer version doesn't change the
-	// Go language we will most likely be able to compile it.
-	buildMajor, buildMinor, _, err := goenv.Parse(runtime.Version())
+	major, minor, err := goenv.GetGorootVersion(goroot)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("could not read version from GOROOT (%v): %v", goroot, err)
 	}
-	if buildMajor != 1 || buildMinor < gorootMinor {
-		return nil, fmt.Errorf("cannot compile with Go toolchain version go%d.%d (TinyGo was built using toolchain version %s)", gorootMajor, gorootMinor, runtime.Version())
+	if major != 1 || minor < 18 || minor > 19 {
+		return nil, fmt.Errorf("requires go version 1.18 through 1.19, got go%d.%d", major, minor)
 	}

+	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
+
 	return &compileopts.Config{
 		Options:        options,
 		Target:         spec,
-		GoMinorVersion: gorootMinor,
+		GoMinorVersion: minor,
+		ClangHeaders:   clangHeaderPath,
 		TestConfig:     options.TestConfig,
 	}, nil
 }
@@ -0,0 +1,105 @@
+package builder
+
+import (
+	"errors"
+	"io/fs"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"tinygo.org/x/go-llvm"
+)
+
+// getClangHeaderPath returns the path to the built-in Clang headers. It tries
+// multiple locations, which should make it find the directory when installed in
+// various ways.
+func getClangHeaderPath(TINYGOROOT string) string {
+	// Check whether we're running from the source directory.
+	path := filepath.Join(TINYGOROOT, "llvm-project", "clang", "lib", "Headers")
+	if _, err := os.Stat(path); !errors.Is(err, fs.ErrNotExist) {
+		return path
+	}
+
+	// Check whether we're running from the installation directory.
+	path = filepath.Join(TINYGOROOT, "lib", "clang", "include")
+	if _, err := os.Stat(path); !errors.Is(err, fs.ErrNotExist) {
+		return path
+	}
+
+	// It looks like we are built with a system-installed LLVM. Do a last
+	// attempt: try to use Clang headers relative to the clang binary.
+	llvmMajor := strings.Split(llvm.Version, ".")[0]
+	for _, cmdName := range commands["clang"] {
+		binpath, err := exec.LookPath(cmdName)
+		if err == nil {
+			// This should be the command that will also be used by
+			// execCommand. To avoid inconsistencies, make sure we use the
+			// headers relative to this command.
+			binpath, err = filepath.EvalSymlinks(binpath)
+			if err != nil {
+				// Unexpected.
+				return ""
+			}
+			// Example executable:
+			//     /usr/lib/llvm-9/bin/clang
+			// Example include path:
+			//     /usr/lib/llvm-9/lib64/clang/9.0.1/include/
+			llvmRoot := filepath.Dir(filepath.Dir(binpath))
+			clangVersionRoot := filepath.Join(llvmRoot, "lib64", "clang")
+			dirs64, err64 := ioutil.ReadDir(clangVersionRoot)
+			// Example include path:
+			//     /usr/lib/llvm-9/lib/clang/9.0.1/include/
+			clangVersionRoot = filepath.Join(llvmRoot, "lib", "clang")
+			dirs32, err32 := ioutil.ReadDir(clangVersionRoot)
+			if err64 != nil && err32 != nil {
+				// Unexpected.
+				continue
+			}
+			dirnames := make([]string, len(dirs64)+len(dirs32))
+			dirCount := 0
+			for _, d := range dirs32 {
+				name := d.Name()
+				if name == llvmMajor || strings.HasPrefix(name, llvmMajor+".") {
+					dirnames[dirCount] = filepath.Join(llvmRoot, "lib", "clang", name)
+					dirCount++
+				}
+			}
+			for _, d := range dirs64 {
+				name := d.Name()
+				if name == llvmMajor || strings.HasPrefix(name, llvmMajor+".") {
+					dirnames[dirCount] = filepath.Join(llvmRoot, "lib64", "clang", name)
+					dirCount++
+				}
+			}
+			sort.Strings(dirnames)
+			// Check for the highest version first.
+			for i := dirCount - 1; i >= 0; i-- {
+				path := filepath.Join(dirnames[i], "include")
+				_, err := os.Stat(filepath.Join(path, "stdint.h"))
+				if err == nil {
+					return path
+				}
+			}
+		}
+	}
+
+	// On Arch Linux, the clang executable is stored in /usr/bin rather than being symlinked from there.
+	// Search directly in /usr/lib for clang.
+	if matches, err := filepath.Glob("/usr/lib/clang/" + llvmMajor + ".*.*"); err == nil {
+		// Check for the highest version first.
+		sort.Strings(matches)
+		for i := len(matches) - 1; i >= 0; i-- {
+			path := filepath.Join(matches[i], "include")
+			_, err := os.Stat(filepath.Join(path, "stdint.h"))
+			if err == nil {
+				return path
+			}
+		}
+	}
+
+	// Could not find it.
+	return ""
+}
@@ -3,8 +3,7 @@ package builder
 // MultiError is a list of multiple errors (actually: diagnostics) returned
 // during LLVM IR generation.
 type MultiError struct {
-	ImportPath string
-	Errs       []error
+	Errs []error
 }

 func (e *MultiError) Error() string {
@@ -15,16 +14,15 @@ func (e *MultiError) Error() string {

 // newMultiError returns a *MultiError if there is more than one error, or
 // returns that error directly when there is only one. Passing an empty slice
-// will return nil (because there is no error).
-// The importPath may be passed if this error is for a single package.
-func newMultiError(errs []error, importPath string) error {
+// will lead to a panic.
+func newMultiError(errs []error) error {
 	switch len(errs) {
 	case 0:
-		return nil
+		panic("attempted to create empty MultiError")
 	case 1:
 		return errs[0]
 	default:
-		return &MultiError{importPath, errs}
+		return &MultiError{errs}
 	}
 }

@@ -23,7 +23,7 @@ type espImageSegment struct {
 	data []byte
 }

-// makeESPFirmareImage converts an input ELF file to an image file for an ESP32 or
+// makeESPFirmare converts an input ELF file to an image file for an ESP32 or
 // ESP8266 chip. This is a special purpose image format just for the ESP chip
 // family, and is parsed by the on-chip mask ROM bootloader.
 //
@@ -17,6 +17,14 @@ import (
 // concurrency or performance issues.
 const jobRunnerDebug = false

+type jobState uint8
+
+const (
+	jobStateQueued   jobState = iota // not yet running
+	jobStateRunning                  // running
+	jobStateFinished                 // finished running
+)
+
 // compileJob is a single compiler job, comparable to a single Makefile target.
 // It is used to orchestrate various compiler tasks that can be run in parallel
 // but that have dependencies and thus have limitations in how they can be run.
@@ -47,11 +55,12 @@ func dummyCompileJob(result string) *compileJob {
 // ordered as such in the job dependencies.
 func runJobs(job *compileJob, sema chan struct{}) error {
 	if sema == nil {
-		// Have a default, if the semaphore isn't set. This is useful for tests.
+		// Have a default, if the semaphore isn't set. This is useful for
+		// tests.
 		sema = make(chan struct{}, runtime.NumCPU())
 	}
 	if cap(sema) == 0 {
-		return errors.New("cannot run 0 jobs at a time")
+		return errors.New("cannot 0 jobs at a time")
 	}

 	// Create a slice of jobs to run, where all dependencies are run in order.
@@ -72,10 +81,10 @@ func runJobs(job *compileJob, sema chan struct{}) error {

 	waiting := make(map[*compileJob]map[*compileJob]struct{}, len(jobs))
 	dependents := make(map[*compileJob][]*compileJob, len(jobs))
-	compileJobs := make(map[*compileJob]int)
+	jidx := make(map[*compileJob]int)
 	var ready intHeap
 	for i, job := range jobs {
-		compileJobs[job] = i
+		jidx[job] = i
 		if len(job.dependencies) == 0 {
 			// This job is ready to run.
 			ready.Push(i)
@@ -96,7 +105,8 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 	// Create a channel to accept notifications of completion.
 	doneChan := make(chan *compileJob)

-	// Send each job in the jobs slice to a worker, taking care of job dependencies.
+	// Send each job in the jobs slice to a worker, taking care of job
+	// dependencies.
 	numRunningJobs := 0
 	var totalTime time.Duration
 	start := time.Now()
@@ -124,7 +134,7 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 		numRunningJobs--
 		<-sema
 		if jobRunnerDebug {
-			fmt.Println("## finished:", completed.description, "(time "+completed.duration.String()+")")
+			fmt.Println("## finished:", job.description, "(time "+job.duration.String()+")")
 		}
 		if completed.err != nil {
 			// Wait for any current jobs to finish.
@@ -146,7 +156,7 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 			delete(wait, completed)
 			if len(wait) == 0 {
 				// This job is now ready to run.
-				ready.Push(compileJobs[j])
+				ready.Push(jidx[j])
 				delete(waiting, j)
 			}
 		}
@@ -15,9 +15,6 @@ import (

 // Library is a container for information about a single C library, such as a
 // compiler runtime or libc.
-//
-// Note: whenever a library gets changed, the version in compileopts/config.go
-// probably also needs to be incremented.
 type Library struct {
 	// The library name, such as compiler-rt or picolibc.
 	name string
@@ -28,22 +25,29 @@ type Library struct {
 	// cflags returns the C flags specific to this library
 	cflags func(target, headerPath string) []string

-	// cflagsForFile returns additional C flags for a particular source file.
-	cflagsForFile func(path string) []string
-
-	// needsLibc is set to true if this library needs libc headers.
-	needsLibc bool
-
 	// The source directory.
 	sourceDir func() string

 	// The source files, relative to sourceDir.
-	librarySources func(target string) ([]string, error)
+	librarySources func(target string) []string

 	// The source code for the crt1.o file, relative to sourceDir.
 	crt1Source string
 }

+// Load the library archive, possibly generating and caching it if needed.
+// The resulting directory may be stored in the provided tmpdir, which is
+// expected to be removed after the Load call.
+func (l *Library) Load(config *compileopts.Config, tmpdir string) (dir string, err error) {
+	job, unlock, err := l.load(config, tmpdir)
+	if err != nil {
+		return "", err
+	}
+	defer unlock()
+	err = runJobs(job, config.Options.Semaphore)
+	return filepath.Dir(job.result), err
+}
+
 // load returns a compile job to build this library file for the given target
 // and CPU. It may return a dummy compileJob if the library build is already
 // cached. The path is stored as job.result but is only valid after the job has
@@ -53,8 +57,13 @@ type Library struct {
 // As a side effect, this call creates the library header files if they didn't
 // exist yet.
 func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJob, abortLock func(), err error) {
-	outdir := config.LibraryPath(l.name)
+	outdir, precompiled := config.LibcPath(l.name)
 	archiveFilePath := filepath.Join(outdir, "lib.a")
+	if precompiled {
+		// Found a precompiled library for this OS/architecture. Return the path
+		// directly.
+		return dummyCompileJob(archiveFilePath), func() {}, nil
+	}

 	// Create a lock on the output (if supported).
 	// This is a bit messy, but avoids a deadlock because it is ordered consistently with other library loads within a build.
@@ -133,11 +142,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// Note: -fdebug-prefix-map is necessary to make the output archive
 	// reproducible. Otherwise the temporary directory is stored in the archive
 	// itself, which varies each run.
-	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-gdwarf-4", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
-	resourceDir := goenv.ClangResourceDir(false)
-	if resourceDir != "" {
-		args = append(args, "-resource-dir="+resourceDir)
-	}
+	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-g", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
 	cpu := config.CPU()
 	if cpu != "" {
 		// X86 has deprecated the -mcpu flag, so we need to use -march instead.
@@ -150,43 +155,31 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 			args = append(args, "-mcpu="+cpu)
 		}
 	}
-	if config.ABI() != "" {
-		args = append(args, "-mabi="+config.ABI())
-	}
-	switch compileopts.CanonicalArchName(target) {
-	case "arm":
+	if strings.HasPrefix(target, "arm") || strings.HasPrefix(target, "thumb") {
 		if strings.Split(target, "-")[2] == "linux" {
 			args = append(args, "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
 		} else {
 			args = append(args, "-fshort-enums", "-fomit-frame-pointer", "-mfloat-abi=soft", "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
 		}
-	case "avr":
+	}
+	if strings.HasPrefix(target, "avr") {
 		// AVR defaults to C float and double both being 32-bit. This deviates
 		// from what most code (and certainly compiler-rt) expects. So we need
 		// to force the compiler to use 64-bit floating point numbers for
 		// double.
 		args = append(args, "-mdouble=64")
-	case "riscv32":
-		args = append(args, "-march=rv32imac", "-fforce-enable-int128")
-	case "riscv64":
-		args = append(args, "-march=rv64gc")
-	case "mips":
-		args = append(args, "-fno-pic")
 	}
-	if config.Target.SoftFloat {
-		// Use softfloat instead of floating point instructions. This is
-		// supported on many architectures.
-		args = append(args, "-msoft-float")
-	} else {
-		if strings.HasPrefix(target, "armv5") {
-			// On ARMv5 we need to explicitly enable hardware floating point
-			// instructions: Clang appears to assume the hardware doesn't have a
-			// FPU otherwise.
-			args = append(args, "-mfpu=vfpv2")
-		}
+	if strings.HasPrefix(target, "riscv32-") {
+		args = append(args, "-march=rv32imac", "-mabi=ilp32", "-fforce-enable-int128")
 	}
-	if l.needsLibc {
-		args = append(args, config.LibcCFlags()...)
+	if strings.HasPrefix(target, "riscv64-") {
+		args = append(args, "-march=rv64gc", "-mabi=lp64")
+	}
+	if strings.HasPrefix(target, "xtensa") {
+		// Hack to work around an issue in the Xtensa port:
+		// https://github.com/espressif/llvm-project/issues/52
+		// Hopefully this will be fixed soon (LLVM 14).
+		args = append(args, "-D__ELF__")
 	}

 	var once sync.Once
@@ -226,13 +219,8 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ

 	// Create jobs to compile all sources. These jobs are depended upon by the
 	// archive job above, so must be run first.
-	paths, err := l.librarySources(target)
-	if err != nil {
-		return nil, nil, err
-	}
-	for _, path := range paths {
+	for _, path := range l.librarySources(target) {
 		// Strip leading "../" parts off the path.
-		path := path
 		cleanpath := path
 		for strings.HasPrefix(cleanpath, "../") {
 			cleanpath = cleanpath[3:]
@@ -241,26 +229,19 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		objpath := filepath.Join(dir, cleanpath+".o")
 		os.MkdirAll(filepath.Dir(objpath), 0o777)
 		objs = append(objs, objpath)
-		objfile := &compileJob{
+		job.dependencies = append(job.dependencies, &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
 				compileArgs = append(compileArgs, args...)
-				if l.cflagsForFile != nil {
-					compileArgs = append(compileArgs, l.cflagsForFile(path)...)
-				}
 				compileArgs = append(compileArgs, "-o", objpath, srcpath)
-				if config.Options.PrintCommands != nil {
-					config.Options.PrintCommands("clang", compileArgs...)
-				}
 				err := runCCompiler(compileArgs...)
 				if err != nil {
 					return &commandError{"failed to build", srcpath, err}
 				}
 				return nil
 			},
-		}
-		job.dependencies = append(job.dependencies, objfile)
+		})
 	}

 	// Create crt1.o job, if needed.
@@ -269,7 +250,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// won't make much of a difference in speed).
 	if l.crt1Source != "" {
 		srcpath := filepath.Join(sourceDir, l.crt1Source)
-		crt1Job := &compileJob{
+		job.dependencies = append(job.dependencies, &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
@@ -280,17 +261,13 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				}
 				tmpfile.Close()
 				compileArgs = append(compileArgs, "-o", tmpfile.Name(), srcpath)
-				if config.Options.PrintCommands != nil {
-					config.Options.PrintCommands("clang", compileArgs...)
-				}
 				err = runCCompiler(compileArgs...)
 				if err != nil {
 					return &commandError{"failed to build", srcpath, err}
 				}
 				return os.Rename(tmpfile.Name(), filepath.Join(outdir, "crt1.o"))
 			},
-		}
-		job.dependencies = append(job.dependencies, crt1Job)
+		})
 	}

 	ok = true
@@ -1,32 +1,29 @@
-//go:build byollvm
+// +build byollvm

 // This file provides C wrappers for liblld.

 #include <lld/Common/Driver.h>
-#include <llvm/Support/Parallel.h>
-
-LLD_HAS_DRIVER(coff)
-LLD_HAS_DRIVER(elf)
-LLD_HAS_DRIVER(mingw)
-LLD_HAS_DRIVER(macho)
-LLD_HAS_DRIVER(wasm)
-
-static void configure() {
-#if _WIN64
-	// This is a hack to work around a hang in the LLD linker on Windows, with
-	// -DLLVM_ENABLE_THREADS=ON. It has a similar effect as the -threads=1
-	// linker flag, but with support for the COFF linker.
-	llvm::parallel::strategy = llvm::hardware_concurrency(1);
-#endif
-}

 extern "C" {

-bool tinygo_link(int argc, char **argv) {
-	configure();
+bool tinygo_link_elf(int argc, char **argv) {
 	std::vector<const char*> args(argv, argv + argc);
-	lld::Result r = lld::lldMain(args, llvm::outs(), llvm::errs(), LLD_ALL_DRIVERS);
-	return !r.retCode;
+	return lld::elf::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_macho(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::macho::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_mingw(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::mingw::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_wasm(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::wasm::link(args, llvm::outs(), llvm::errs(), false, false);
 }

 } // external "C"
@@ -1,7 +1,6 @@
 package builder

 import (
-	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -10,7 +9,7 @@ import (
 	"github.com/tinygo-org/tinygo/goenv"
 )

-var libMinGW = Library{
+var MinGW = Library{
 	name: "mingw-w64",
 	makeHeaders: func(target, includeDir string) error {
 		// copy _mingw.h
@@ -27,30 +26,14 @@ var libMinGW = Library{
 		_, err = io.Copy(outf, inf)
 		return err
 	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64") },
+	sourceDir: func() string { return "" }, // unused
 	cflags: func(target, headerPath string) []string {
-		mingwDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", mingwDir + "/mingw-w64-headers/crt",
-			"-I", mingwDir + "/mingw-w64-headers/defaults/include",
-			"-I" + headerPath,
-		}
+		// No flags necessary because there are no files to compile.
+		return nil
 	},
-	librarySources: func(target string) ([]string, error) {
-		// These files are needed so that printf and the like are supported.
-		sources := []string{
-			"mingw-w64-crt/stdio/ucrt_fprintf.c",
-			"mingw-w64-crt/stdio/ucrt_fwprintf.c",
-			"mingw-w64-crt/stdio/ucrt_printf.c",
-			"mingw-w64-crt/stdio/ucrt_snprintf.c",
-			"mingw-w64-crt/stdio/ucrt_sprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vfprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vsnprintf.c",
-			"mingw-w64-crt/stdio/ucrt_vsprintf.c",
-		}
-		return sources, nil
+	librarySources: func(target string) []string {
+		// We only use the UCRT DLL file. No source files necessary.
+		return nil
 	},
 }

@@ -60,7 +43,7 @@ var libMinGW = Library{
 //
 // TODO: cache the result. At the moment, it costs a few hundred milliseconds to
 // compile these files.
-func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
+func makeMinGWExtraLibs(tmpdir string) []*compileJob {
 	var jobs []*compileJob
 	root := goenv.Get("TINYGOROOT")
 	// Normally all the api-ms-win-crt-*.def files are all compiled to a single
@@ -69,7 +52,7 @@ func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 	for _, name := range []string{
 		"kernel32.def.in",
 		"api-ms-win-crt-conio-l1-1-0.def",
-		"api-ms-win-crt-convert-l1-1-0.def.in",
+		"api-ms-win-crt-convert-l1-1-0.def",
 		"api-ms-win-crt-environment-l1-1-0.def",
 		"api-ms-win-crt-filesystem-l1-1-0.def",
 		"api-ms-win-crt-heap-l1-1-0.def",
@@ -91,27 +74,16 @@ func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 			result:      outpath,
 			run: func(job *compileJob) error {
 				defpath := inpath
-				var archDef, emulation string
-				switch goarch {
-				case "amd64":
-					archDef = "-DDEF_X64"
-					emulation = "i386pep"
-				case "arm64":
-					archDef = "-DDEF_ARM64"
-					emulation = "arm64pe"
-				default:
-					return fmt.Errorf("unsupported architecture for mingw-w64: %s", goarch)
-				}
 				if strings.HasSuffix(inpath, ".in") {
 					// .in files need to be preprocessed by a preprocessor (-E)
 					// first.
 					defpath = outpath + ".def"
-					err := runCCompiler("-E", "-x", "c", "-Wp,-w", "-P", archDef, "-DDATA", "-o", defpath, inpath, "-I"+goenv.Get("TINYGOROOT")+"/lib/mingw-w64/mingw-w64-crt/def-include/")
+					err := runCCompiler("-E", "-x", "c", "-Wp,-w", "-P", "-DDEF_X64", "-DDATA", "-o", defpath, inpath, "-I"+goenv.Get("TINYGOROOT")+"/lib/mingw-w64/mingw-w64-crt/def-include/")
 					if err != nil {
 						return err
 					}
 				}
-				return link("ld.lld", "-m", emulation, "-o", outpath, defpath)
+				return link("ld.lld", "-m", "i386pep", "-o", outpath, defpath)
 			},
 		}
 		jobs = append(jobs, job)
@@ -12,46 +12,7 @@ import (
 	"github.com/tinygo-org/tinygo/goenv"
 )

-// Create the alltypes.h file from the appropriate alltypes.h.in files.
-func buildMuslAllTypes(arch, muslDir, outputBitsDir string) error {
-	// Create the file alltypes.h.
-	f, err := os.Create(filepath.Join(outputBitsDir, "alltypes.h"))
-	if err != nil {
-		return err
-	}
-	infiles := []string{
-		filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
-		filepath.Join(muslDir, "include", "alltypes.h.in"),
-	}
-	for _, infile := range infiles {
-		data, err := os.ReadFile(infile)
-		if err != nil {
-			return err
-		}
-		lines := strings.Split(string(data), "\n")
-		for _, line := range lines {
-			if strings.HasPrefix(line, "TYPEDEF ") {
-				matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
-				value := matches[1]
-				name := matches[2]
-				line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
-			}
-			if strings.HasPrefix(line, "STRUCT ") {
-				matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
-				name := matches[1]
-				value := matches[2]
-				line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
-			}
-			_, err := f.WriteString(line + "\n")
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return f.Close()
-}
-
-var libMusl = Library{
+var Musl = Library{
 	name: "musl",
 	makeHeaders: func(target, includeDir string) error {
 		bits := filepath.Join(includeDir, "bits")
@@ -63,13 +24,41 @@ var libMusl = Library{
 		arch := compileopts.MuslArchitecture(target)
 		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "musl")

-		err = buildMuslAllTypes(arch, muslDir, bits)
+		// Create the file alltypes.h.
+		f, err := os.Create(filepath.Join(bits, "alltypes.h"))
 		if err != nil {
 			return err
 		}
+		infiles := []string{
+			filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
+			filepath.Join(muslDir, "include", "alltypes.h.in"),
+		}
+		for _, infile := range infiles {
+			data, err := os.ReadFile(infile)
+			if err != nil {
+				return err
+			}
+			lines := strings.Split(string(data), "\n")
+			for _, line := range lines {
+				if strings.HasPrefix(line, "TYPEDEF ") {
+					matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
+					value := matches[1]
+					name := matches[2]
+					line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
+				}
+				if strings.HasPrefix(line, "STRUCT ") {
+					matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
+					name := matches[1]
+					value := matches[2]
+					line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
+				}
+				f.WriteString(line + "\n")
+			}
+		}
+		f.Close()

 		// Create the file syscall.h.
-		f, err := os.Create(filepath.Join(bits, "syscall.h"))
+		f, err = os.Create(filepath.Join(bits, "syscall.h"))
 		if err != nil {
 			return err
 		}
@@ -88,7 +77,7 @@ var libMusl = Library{
 	cflags: func(target, headerPath string) []string {
 		arch := compileopts.MuslArchitecture(target)
 		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl")
-		cflags := []string{
+		return []string{
 			"-std=c99",            // same as in musl
 			"-D_XOPEN_SOURCE=700", // same as in musl
 			// Musl triggers some warnings and we don't want to show any
@@ -101,10 +90,6 @@ var libMusl = Library{
 			"-Wno-ignored-attributes",
 			"-Wno-string-plus-int",
 			"-Wno-ignored-pragmas",
-			"-Wno-tautological-constant-out-of-range-compare",
-			"-Wno-deprecated-non-prototype",
-			"-Wno-format",
-			"-Wno-parentheses",
 			"-Qunused-arguments",
 			// Select include dirs. Don't include standard library includes
 			// (that would introduce host dependencies and other complications),
@@ -118,56 +103,30 @@ var libMusl = Library{
 			"-I" + muslDir + "/include",
 			"-fno-stack-protector",
 		}
-		return cflags
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl/src") },
-	librarySources: func(target string) ([]string, error) {
+	librarySources: func(target string) []string {
 		arch := compileopts.MuslArchitecture(target)
 		globs := []string{
-			"conf/*.c",
-			"ctype/*.c",
 			"env/*.c",
 			"errno/*.c",
 			"exit/*.c",
-			"fcntl/*.c",
 			"internal/defsysinfo.c",
-			"internal/intscan.c",
 			"internal/libc.c",
-			"internal/shgetc.c",
 			"internal/syscall_ret.c",
 			"internal/vdso.c",
 			"legacy/*.c",
-			"locale/*.c",
-			"linux/*.c",
-			"locale/*.c",
 			"malloc/*.c",
-			"malloc/mallocng/*.c",
 			"mman/*.c",
 			"math/*.c",
-			"misc/*.c",
-			"multibyte/*.c",
-			"sched/*.c",
-			"signal/" + arch + "/*.s",
 			"signal/*.c",
 			"stdio/*.c",
-			"stdlib/*.c",
 			"string/*.c",
 			"thread/" + arch + "/*.s",
+			"thread/" + arch + "/*.c",
 			"thread/*.c",
 			"time/*.c",
 			"unistd/*.c",
-			"process/*.c",
-		}
-
-		if arch == "arm" {
-			// These files need to be added to the start for some reason.
-			globs = append([]string{"thread/arm/*.c"}, globs...)
-		}
-
-		if arch != "aarch64" && arch != "mips" {
-			//aarch64 and mips have no architecture specific code, either they
-			// are not supported or don't need any?
-			globs = append([]string{"process/" + arch + "/*.s"}, globs...)
 		}

 		var sources []string
@@ -182,16 +141,13 @@ var libMusl = Library{
 				// > ErrBadPattern, when pattern is malformed.
 				// So the only possible error is when the (statically defined)
 				// pattern is wrong. In other words, a programming bug.
-				return nil, fmt.Errorf("musl: could not glob source dirs: %w", err)
-			}
-			if len(matches) == 0 {
-				return nil, fmt.Errorf("musl: did not find any files for pattern %#v", pattern)
+				panic("could not glob source dirs: " + err.Error())
 			}
 			for _, match := range matches {
 				relpath, err := filepath.Rel(basepath, match)
 				if err != nil {
 					// Not sure if this is even possible.
-					return nil, err
+					panic(err)
 				}
 				// Make sure architecture specific files override generic files.
 				id := strings.ReplaceAll(relpath, "/"+arch+"/", "/")
@@ -203,7 +159,7 @@ var libMusl = Library{
 				sources = append(sources, relpath)
 			}
 		}
-		return sources, nil
+		return sources
 	},
 	crt1Source: "../crt/crt1.c", // lib/musl/crt/crt1.c
 }
@@ -1,117 +1,27 @@
 package builder

 import (
-	"archive/zip"
-	"bytes"
-	"encoding/binary"
-	"encoding/json"
-	"os"
+	"fmt"
+	"io"
+	"os/exec"

-	"github.com/sigurn/crc16"
 	"github.com/tinygo-org/tinygo/compileopts"
 )

-// Structure of the manifest.json file.
-type jsonManifest struct {
-	Manifest struct {
-		Application struct {
-			BinaryFile     string        `json:"bin_file"`
-			DataFile       string        `json:"dat_file"`
-			InitPacketData nrfInitPacket `json:"init_packet_data"`
-		} `json:"application"`
-		DFUVersion float64 `json:"dfu_version"` // yes, this is a JSON number, not a string
-	} `json:"manifest"`
-}
+// https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrfutil%2FUG%2Fnrfutil%2Fnrfutil_intro.html

-// Structure of the init packet.
-// Source:
-// https://github.com/adafruit/Adafruit_nRF52_Bootloader/blob/master/lib/sdk11/components/libraries/bootloader_dfu/dfu_init.h#L47-L57
-type nrfInitPacket struct {
-	ApplicationVersion uint32   `json:"application_version"`
-	DeviceRevision     uint16   `json:"device_revision"`
-	DeviceType         uint16   `json:"device_type"`
-	FirmwareCRC16      uint16   `json:"firmware_crc16"`
-	SoftDeviceRequired []uint16 `json:"softdevice_req"` // this is actually a variable length array
-}
-
-// Create the init packet (the contents of application.dat).
-func (p nrfInitPacket) createInitPacket() []byte {
-	buf := &bytes.Buffer{}
-	binary.Write(buf, binary.LittleEndian, p.DeviceType)                      // uint16_t device_type;
-	binary.Write(buf, binary.LittleEndian, p.DeviceRevision)                  // uint16_t device_rev;
-	binary.Write(buf, binary.LittleEndian, p.ApplicationVersion)              // uint32_t app_version;
-	binary.Write(buf, binary.LittleEndian, uint16(len(p.SoftDeviceRequired))) // uint16_t softdevice_len;
-	binary.Write(buf, binary.LittleEndian, p.SoftDeviceRequired)              // uint16_t softdevice[1];
-	binary.Write(buf, binary.LittleEndian, p.FirmwareCRC16)
-	return buf.Bytes()
-}
-
-// Make a Nordic DFU firmware image from an ELF file.
 func makeDFUFirmwareImage(options *compileopts.Options, infile, outfile string) error {
-	// Read ELF file as input and convert it to a binary image file.
-	_, data, err := extractROM(infile)
-	if err != nil {
-		return err
+	cmdLine := []string{"nrfutil", "pkg", "generate", "--hw-version", "52", "--sd-req", "0x0", "--debug-mode", "--application", infile, outfile}
+
+	if options.PrintCommands != nil {
+		options.PrintCommands(cmdLine[0], cmdLine[1:]...)
 	}

-	// Create the zip file in memory.
-	// It won't be very large anyway.
-	buf := &bytes.Buffer{}
-	w := zip.NewWriter(buf)
-
-	// Write the application binary to the zip file.
-	binw, err := w.Create("application.bin")
+	cmd := exec.Command(cmdLine[0], cmdLine[1:]...)
+	cmd.Stdout = io.Discard
+	err := cmd.Run()
 	if err != nil {
-		return err
+		return fmt.Errorf("could not run nrfutil pkg generate: %w", err)
 	}
-	_, err = binw.Write(data)
-	if err != nil {
-		return err
-	}
-
-	// Create the init packet.
-	initPacket := nrfInitPacket{
-		ApplicationVersion: 0xffff_ffff, // appears to be unused by the Adafruit bootloader
-		DeviceRevision:     0xffff,      // DFU_DEVICE_REVISION_EMPTY
-		DeviceType:         0x0052,      // ADAFRUIT_DEVICE_TYPE
-		FirmwareCRC16:      crc16.Checksum(data, crc16.MakeTable(crc16.CRC16_CCITT_FALSE)),
-		SoftDeviceRequired: []uint16{0xfffe}, // DFU_SOFTDEVICE_ANY
-	}
-
-	// Write the init packet to the zip file.
-	datw, err := w.Create("application.dat")
-	if err != nil {
-		return err
-	}
-	_, err = datw.Write(initPacket.createInitPacket())
-	if err != nil {
-		return err
-	}
-
-	// Create the JSON manifest.
-	manifest := &jsonManifest{}
-	manifest.Manifest.Application.BinaryFile = "application.bin"
-	manifest.Manifest.Application.DataFile = "application.dat"
-	manifest.Manifest.Application.InitPacketData = initPacket
-	manifest.Manifest.DFUVersion = 0.5
-
-	// Write the JSON manifest to the file.
-	jsonw, err := w.Create("manifest.json")
-	if err != nil {
-		return err
-	}
-	enc := json.NewEncoder(jsonw)
-	enc.SetIndent("", "    ")
-	err = enc.Encode(manifest)
-	if err != nil {
-		return err
-	}
-
-	// Finish the zip file.
-	err = w.Close()
-	if err != nil {
-		return err
-	}
-
-	return os.WriteFile(outfile, buf.Bytes(), 0o666)
+	return nil
 }
@@ -3,14 +3,13 @@ package builder
 import (
 	"os"
 	"path/filepath"
-	"strings"

 	"github.com/tinygo-org/tinygo/goenv"
 )

-// libPicolibc is a C library for bare metal embedded devices. It was originally
+// Picolibc is a C library for bare metal embedded devices. It was originally
 // based on newlib.
-var libPicolibc = Library{
+var Picolibc = Library{
 	name: "picolibc",
 	makeHeaders: func(target, includeDir string) error {
 		f, err := os.Create(filepath.Join(includeDir, "picolibc.h"))
@@ -26,15 +25,11 @@ var libPicolibc = Library{
 			"-Wall",
 			"-std=gnu11",
 			"-D_COMPILING_NEWLIB",
-			"-D_HAVE_ALIAS_ATTRIBUTE",
+			"-DHAVE_ALIAS_ATTRIBUTE",
 			"-DTINY_STDIO",
-			"-DPOSIX_IO",
-			"-DFORMAT_DEFAULT_INTEGER", // use __i_vfprintf and __i_vfscanf by default
 			"-D_IEEE_LIBM",
 			"-D__OBSOLETE_MATH_FLOAT=1", // use old math code that doesn't expect a FPU
 			"-D__OBSOLETE_MATH_DOUBLE=0",
-			"-D_WANT_IO_C99_FORMATS",
-			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
 			"-nostdlibinc",
 			"-isystem", newlibDir + "/libc/include",
 			"-I" + newlibDir + "/libc/tinystdio",
@@ -43,24 +38,111 @@ var libPicolibc = Library{
 		}
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib") },
-	librarySources: func(target string) ([]string, error) {
-		sources := append([]string(nil), picolibcSources...)
-		if !strings.HasPrefix(target, "avr") {
-			// Small chips without long jumps can't compile many files (printf,
-			// pow, etc). Therefore exclude those source files for those chips.
-			// Unfortunately it's difficult to exclude only some chips, so this
-			// excludes those files on all AVR chips for now.
-			// More information:
-			// https://github.com/llvm/llvm-project/issues/67042
-			sources = append(sources, picolibcSourcesLarge...)
-		}
-		return sources, nil
+	librarySources: func(target string) []string {
+		return picolibcSources
 	},
 }

 var picolibcSources = []string{
 	"../../picolibc-stdio.c",

+	"libc/tinystdio/asprintf.c",
+	"libc/tinystdio/atod_engine.c",
+	"libc/tinystdio/atod_ryu.c",
+	"libc/tinystdio/atof_engine.c",
+	"libc/tinystdio/atof_ryu.c",
+	//"libc/tinystdio/atold_engine.c", // have_long_double and not long_double_equals_double
+	"libc/tinystdio/clearerr.c",
+	"libc/tinystdio/compare_exchange.c",
+	"libc/tinystdio/dtoa_data.c",
+	"libc/tinystdio/dtoa_engine.c",
+	"libc/tinystdio/dtoa_ryu.c",
+	"libc/tinystdio/ecvtbuf.c",
+	"libc/tinystdio/ecvt.c",
+	"libc/tinystdio/ecvt_data.c",
+	"libc/tinystdio/ecvtfbuf.c",
+	"libc/tinystdio/ecvtf.c",
+	"libc/tinystdio/ecvtf_data.c",
+	"libc/tinystdio/exchange.c",
+	//"libc/tinystdio/fclose.c", // posix-io
+	"libc/tinystdio/fcvtbuf.c",
+	"libc/tinystdio/fcvt.c",
+	"libc/tinystdio/fcvtfbuf.c",
+	"libc/tinystdio/fcvtf.c",
+	"libc/tinystdio/fdevopen.c",
+	//"libc/tinystdio/fdopen.c", // posix-io
+	"libc/tinystdio/feof.c",
+	"libc/tinystdio/ferror.c",
+	"libc/tinystdio/fflush.c",
+	"libc/tinystdio/fgetc.c",
+	"libc/tinystdio/fgets.c",
+	"libc/tinystdio/fileno.c",
+	"libc/tinystdio/filestrget.c",
+	"libc/tinystdio/filestrputalloc.c",
+	"libc/tinystdio/filestrput.c",
+	//"libc/tinystdio/fopen.c", // posix-io
+	"libc/tinystdio/fprintf.c",
+	"libc/tinystdio/fputc.c",
+	"libc/tinystdio/fputs.c",
+	"libc/tinystdio/fread.c",
+	"libc/tinystdio/fscanf.c",
+	"libc/tinystdio/fseek.c",
+	"libc/tinystdio/ftell.c",
+	"libc/tinystdio/ftoa_data.c",
+	"libc/tinystdio/ftoa_engine.c",
+	"libc/tinystdio/ftoa_ryu.c",
+	"libc/tinystdio/fwrite.c",
+	"libc/tinystdio/gcvtbuf.c",
+	"libc/tinystdio/gcvt.c",
+	"libc/tinystdio/gcvtfbuf.c",
+	"libc/tinystdio/gcvtf.c",
+	"libc/tinystdio/getchar.c",
+	"libc/tinystdio/gets.c",
+	"libc/tinystdio/matchcaseprefix.c",
+	"libc/tinystdio/perror.c",
+	//"libc/tinystdio/posixiob.c", // posix-io
+	//"libc/tinystdio/posixio.c", // posix-io
+	"libc/tinystdio/printf.c",
+	"libc/tinystdio/putchar.c",
+	"libc/tinystdio/puts.c",
+	"libc/tinystdio/ryu_divpow2.c",
+	"libc/tinystdio/ryu_log10.c",
+	"libc/tinystdio/ryu_log2pow5.c",
+	"libc/tinystdio/ryu_pow5bits.c",
+	"libc/tinystdio/ryu_table.c",
+	"libc/tinystdio/ryu_umul128.c",
+	"libc/tinystdio/scanf.c",
+	"libc/tinystdio/setbuf.c",
+	"libc/tinystdio/setvbuf.c",
+	//"libc/tinystdio/sflags.c", // posix-io
+	"libc/tinystdio/snprintf.c",
+	"libc/tinystdio/snprintfd.c",
+	"libc/tinystdio/snprintff.c",
+	"libc/tinystdio/sprintf.c",
+	"libc/tinystdio/sprintfd.c",
+	"libc/tinystdio/sprintff.c",
+	"libc/tinystdio/sscanf.c",
+	"libc/tinystdio/strfromd.c",
+	"libc/tinystdio/strfromf.c",
+	"libc/tinystdio/strtod.c",
+	"libc/tinystdio/strtod_l.c",
+	"libc/tinystdio/strtof.c",
+	//"libc/tinystdio/strtold.c",   // have_long_double and not long_double_equals_double
+	//"libc/tinystdio/strtold_l.c", // have_long_double and not long_double_equals_double
+	"libc/tinystdio/ungetc.c",
+	"libc/tinystdio/vasprintf.c",
+	"libc/tinystdio/vfiprintf.c",
+	"libc/tinystdio/vfiscanf.c",
+	"libc/tinystdio/vfprintf.c",
+	"libc/tinystdio/vfprintff.c",
+	"libc/tinystdio/vfscanf.c",
+	"libc/tinystdio/vfscanff.c",
+	"libc/tinystdio/vprintf.c",
+	"libc/tinystdio/vscanf.c",
+	"libc/tinystdio/vsnprintf.c",
+	"libc/tinystdio/vsprintf.c",
+	"libc/tinystdio/vsscanf.c",
+
 	"libc/string/bcmp.c",
 	"libc/string/bcopy.c",
 	"libc/string/bzero.c",
@@ -164,87 +246,6 @@ var picolibcSources = []string{
 	"libc/string/wmempcpy.c",
 	"libc/string/wmemset.c",
 	"libc/string/xpg_strerror_r.c",
-}
-
-// Parts of picolibc that are too large for small AVRs.
-var picolibcSourcesLarge = []string{
-	// srcs_tinystdio
-	"libc/tinystdio/asprintf.c",
-	"libc/tinystdio/bufio.c",
-	"libc/tinystdio/clearerr.c",
-	"libc/tinystdio/ecvt_r.c",
-	"libc/tinystdio/ecvt.c",
-	"libc/tinystdio/ecvtf_r.c",
-	"libc/tinystdio/ecvtf.c",
-	"libc/tinystdio/fcvt.c",
-	"libc/tinystdio/fcvt_r.c",
-	"libc/tinystdio/fcvtf.c",
-	"libc/tinystdio/fcvtf_r.c",
-	"libc/tinystdio/gcvt.c",
-	"libc/tinystdio/gcvtf.c",
-	"libc/tinystdio/fclose.c",
-	"libc/tinystdio/fdevopen.c",
-	"libc/tinystdio/feof.c",
-	"libc/tinystdio/ferror.c",
-	"libc/tinystdio/fflush.c",
-	"libc/tinystdio/fgetc.c",
-	"libc/tinystdio/fgets.c",
-	"libc/tinystdio/fileno.c",
-	"libc/tinystdio/filestrget.c",
-	"libc/tinystdio/filestrput.c",
-	"libc/tinystdio/filestrputalloc.c",
-	"libc/tinystdio/fmemopen.c",
-	"libc/tinystdio/fprintf.c",
-	"libc/tinystdio/fputc.c",
-	"libc/tinystdio/fputs.c",
-	"libc/tinystdio/fread.c",
-	//"libc/tinystdio/freopen.c", // crashes with AVR, see: https://github.com/picolibc/picolibc/pull/369
-	"libc/tinystdio/fscanf.c",
-	"libc/tinystdio/fseek.c",
-	"libc/tinystdio/fseeko.c",
-	"libc/tinystdio/ftell.c",
-	"libc/tinystdio/ftello.c",
-	"libc/tinystdio/fwrite.c",
-	"libc/tinystdio/getchar.c",
-	"libc/tinystdio/gets.c",
-	"libc/tinystdio/matchcaseprefix.c",
-	"libc/tinystdio/mktemp.c",
-	"libc/tinystdio/perror.c",
-	"libc/tinystdio/printf.c",
-	"libc/tinystdio/putchar.c",
-	"libc/tinystdio/puts.c",
-	"libc/tinystdio/rewind.c",
-	"libc/tinystdio/scanf.c",
-	"libc/tinystdio/setbuf.c",
-	"libc/tinystdio/setbuffer.c",
-	"libc/tinystdio/setlinebuf.c",
-	"libc/tinystdio/setvbuf.c",
-	"libc/tinystdio/snprintf.c",
-	"libc/tinystdio/sprintf.c",
-	"libc/tinystdio/snprintfd.c",
-	"libc/tinystdio/snprintff.c",
-	"libc/tinystdio/sprintff.c",
-	"libc/tinystdio/sprintfd.c",
-	"libc/tinystdio/sscanf.c",
-	"libc/tinystdio/strfromf.c",
-	"libc/tinystdio/strfromd.c",
-	"libc/tinystdio/strtof.c",
-	"libc/tinystdio/strtof_l.c",
-	"libc/tinystdio/strtod.c",
-	"libc/tinystdio/strtod_l.c",
-	"libc/tinystdio/ungetc.c",
-	"libc/tinystdio/vasprintf.c",
-	"libc/tinystdio/vfiprintf.c",
-	"libc/tinystdio/vfprintf.c",
-	"libc/tinystdio/vfprintff.c",
-	"libc/tinystdio/vfscanf.c",
-	"libc/tinystdio/vfiscanf.c",
-	"libc/tinystdio/vfscanff.c",
-	"libc/tinystdio/vprintf.c",
-	"libc/tinystdio/vscanf.c",
-	"libc/tinystdio/vsscanf.c",
-	"libc/tinystdio/vsnprintf.c",
-	"libc/tinystdio/vsprintf.c",

 	"libm/common/sf_finite.c",
 	"libm/common/sf_copysign.c",
@@ -299,7 +300,6 @@ var picolibcSourcesLarge = []string{
 	"libm/common/s_expm1.c",
 	"libm/common/s_ilogb.c",
 	"libm/common/s_infinity.c",
-	"libm/common/s_iseqsig.c",
 	"libm/common/s_isinf.c",
 	"libm/common/s_isinfd.c",
 	"libm/common/s_isnan.c",
@@ -317,7 +317,6 @@ var picolibcSourcesLarge = []string{
 	"libm/common/s_fmax.c",
 	"libm/common/s_fmin.c",
 	"libm/common/s_fpclassify.c",
-	"libm/common/s_getpayload.c",
 	"libm/common/s_lrint.c",
 	"libm/common/s_llrint.c",
 	"libm/common/s_lround.c",
@@ -332,6 +331,7 @@ var picolibcSourcesLarge = []string{
 	"libm/common/exp2.c",
 	"libm/common/exp_data.c",
 	"libm/common/math_err_with_errno.c",
+	"libm/common/math_err_xflow.c",
 	"libm/common/math_err_uflow.c",
 	"libm/common/math_err_oflow.c",
 	"libm/common/math_err_divzero.c",
@@ -339,14 +339,6 @@ var picolibcSourcesLarge = []string{
 	"libm/common/math_err_may_uflow.c",
 	"libm/common/math_err_check_uflow.c",
 	"libm/common/math_err_check_oflow.c",
-	"libm/common/math_errf_divzerof.c",
-	"libm/common/math_errf_invalidf.c",
-	"libm/common/math_errf_may_uflowf.c",
-	"libm/common/math_errf_oflowf.c",
-	"libm/common/math_errf_uflowf.c",
-	"libm/common/math_errf_with_errnof.c",
-	"libm/common/math_inexact.c",
-	"libm/common/math_inexactf.c",
 	"libm/common/log.c",
 	"libm/common/log_data.c",
 	"libm/common/log2.c",
@@ -354,91 +346,76 @@ var picolibcSourcesLarge = []string{
 	"libm/common/pow.c",
 	"libm/common/pow_log_data.c",

-	"libm/math/k_cos.c",
-	"libm/math/k_rem_pio2.c",
-	"libm/math/k_sin.c",
-	"libm/math/k_tan.c",
-	"libm/math/kf_cos.c",
-	"libm/math/kf_rem_pio2.c",
-	"libm/math/kf_sin.c",
-	"libm/math/kf_tan.c",
-	"libm/math/s_acos.c",
-	"libm/math/s_acosh.c",
-	"libm/math/s_asin.c",
+	"libm/math/e_acos.c",
+	"libm/math/e_acosh.c",
+	"libm/math/e_asin.c",
+	"libm/math/e_atan2.c",
+	"libm/math/e_atanh.c",
+	"libm/math/e_cosh.c",
+	"libm/math/e_exp.c",
+	"libm/math/ef_acos.c",
+	"libm/math/ef_acosh.c",
+	"libm/math/ef_asin.c",
+	"libm/math/ef_atan2.c",
+	"libm/math/ef_atanh.c",
+	"libm/math/ef_cosh.c",
+	"libm/math/ef_exp.c",
+	"libm/math/ef_fmod.c",
+	"libm/math/ef_hypot.c",
+	"libm/math/ef_j0.c",
+	"libm/math/ef_j1.c",
+	"libm/math/ef_jn.c",
+	"libm/math/ef_lgamma.c",
+	"libm/math/ef_log10.c",
+	"libm/math/ef_log.c",
+	"libm/math/e_fmod.c",
+	"libm/math/ef_pow.c",
+	"libm/math/ef_remainder.c",
+	"libm/math/ef_rem_pio2.c",
+	"libm/math/ef_scalb.c",
+	"libm/math/ef_sinh.c",
+	"libm/math/ef_sqrt.c",
+	"libm/math/ef_tgamma.c",
+	"libm/math/e_hypot.c",
+	"libm/math/e_j0.c",
+	"libm/math/e_j1.c",
+	"libm/math/e_jn.c",
+	"libm/math/e_lgamma.c",
+	"libm/math/e_log10.c",
+	"libm/math/e_log.c",
+	"libm/math/e_pow.c",
+	"libm/math/e_remainder.c",
+	"libm/math/e_rem_pio2.c",
+	"libm/math/erf_lgamma.c",
+	"libm/math/er_lgamma.c",
+	"libm/math/e_scalb.c",
+	"libm/math/e_sinh.c",
+	"libm/math/e_sqrt.c",
+	"libm/math/e_tgamma.c",
 	"libm/math/s_asinh.c",
 	"libm/math/s_atan.c",
-	"libm/math/s_atan2.c",
-	"libm/math/s_atanh.c",
 	"libm/math/s_ceil.c",
 	"libm/math/s_cos.c",
-	"libm/math/s_cosh.c",
-	"libm/math/s_drem.c",
 	"libm/math/s_erf.c",
-	"libm/math/s_exp.c",
-	"libm/math/s_exp2.c",
 	"libm/math/s_fabs.c",
-	"libm/math/s_floor.c",
-	"libm/math/s_fmod.c",
-	"libm/math/s_frexp.c",
-	"libm/math/s_gamma.c",
-	"libm/math/s_hypot.c",
-	"libm/math/s_j0.c",
-	"libm/math/s_j1.c",
-	"libm/math/s_jn.c",
-	"libm/math/s_lgamma.c",
-	"libm/math/s_log.c",
-	"libm/math/s_log10.c",
-	"libm/math/s_pow.c",
-	"libm/math/s_rem_pio2.c",
-	"libm/math/s_remainder.c",
-	"libm/math/s_scalb.c",
-	"libm/math/s_signif.c",
-	"libm/math/s_sin.c",
-	"libm/math/s_sincos.c",
-	"libm/math/s_sinh.c",
-	"libm/math/s_sqrt.c",
-	"libm/math/s_tan.c",
-	"libm/math/s_tanh.c",
-	"libm/math/s_tgamma.c",
-	"libm/math/sf_acos.c",
-	"libm/math/sf_acosh.c",
-	"libm/math/sf_asin.c",
 	"libm/math/sf_asinh.c",
 	"libm/math/sf_atan.c",
-	"libm/math/sf_atan2.c",
-	"libm/math/sf_atanh.c",
 	"libm/math/sf_ceil.c",
 	"libm/math/sf_cos.c",
-	"libm/math/sf_cosh.c",
-	"libm/math/sf_drem.c",
 	"libm/math/sf_erf.c",
-	"libm/math/sf_exp.c",
-	"libm/math/sf_exp2.c",
 	"libm/math/sf_fabs.c",
 	"libm/math/sf_floor.c",
-	"libm/math/sf_fmod.c",
 	"libm/math/sf_frexp.c",
-	"libm/math/sf_gamma.c",
-	"libm/math/sf_hypot.c",
-	"libm/math/sf_j0.c",
-	"libm/math/sf_j1.c",
-	"libm/math/sf_jn.c",
-	"libm/math/sf_lgamma.c",
-	"libm/math/sf_log.c",
-	"libm/math/sf_log10.c",
-	"libm/math/sf_log2.c",
-	"libm/math/sf_pow.c",
-	"libm/math/sf_rem_pio2.c",
-	"libm/math/sf_remainder.c",
-	"libm/math/sf_scalb.c",
+	"libm/math/sf_ldexp.c",
+	"libm/math/s_floor.c",
+	"libm/math/s_frexp.c",
 	"libm/math/sf_signif.c",
 	"libm/math/sf_sin.c",
-	"libm/math/sf_sincos.c",
-	"libm/math/sf_sinh.c",
-	"libm/math/sf_sqrt.c",
 	"libm/math/sf_tan.c",
 	"libm/math/sf_tanh.c",
-	"libm/math/sf_tgamma.c",
-	"libm/math/sr_lgamma.c",
-	"libm/math/srf_lgamma.c",
+	"libm/math/s_ldexp.c",
+	"libm/math/s_signif.c",
+	"libm/math/s_sin.c",
+	"libm/math/s_tan.c",
+	"libm/math/s_tanh.c",
 }
@@ -1,56 +0,0 @@
-package builder
-
-import (
-	_ "embed"
-	"fmt"
-	"html/template"
-	"os"
-)
-
-//go:embed size-report.html
-var sizeReportBase string
-
-func writeSizeReport(sizes *programSize, filename, pkgName string) error {
-	tmpl, err := template.New("report").Parse(sizeReportBase)
-	if err != nil {
-		return err
-	}
-
-	f, err := os.Create(filename)
-	if err != nil {
-		return fmt.Errorf("could not open report file: %w", err)
-	}
-	defer f.Close()
-
-	// Prepare data for the report.
-	type sizeLine struct {
-		Name string
-		Size *packageSize
-	}
-	programData := []sizeLine{}
-	for _, name := range sizes.sortedPackageNames() {
-		pkgSize := sizes.Packages[name]
-		programData = append(programData, sizeLine{
-			Name: name,
-			Size: pkgSize,
-		})
-	}
-	sizeTotal := map[string]uint64{
-		"code":   sizes.Code,
-		"rodata": sizes.ROData,
-		"data":   sizes.Data,
-		"bss":    sizes.BSS,
-		"flash":  sizes.Flash(),
-	}
-
-	// Write the report.
-	err = tmpl.Execute(f, map[string]any{
-		"pkgName":   pkgName,
-		"sizes":     programData,
-		"sizeTotal": sizeTotal,
-	})
-	if err != nil {
-		return fmt.Errorf("could not create report file: %w", err)
-	}
-	return nil
-}
@@ -1,109 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <title>Size Report for {{.pkgName}}</title>
-    <meta charset="utf-8"/>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
-    <style>
-
-.table-vertical-border {
-  border-left: calc(var(--bs-border-width) * 2) solid currentcolor;
-}
-
-/* Hover on only the rows that are clickable. */
-.row-package:hover > * {
-  --bs-table-color-state: var(--bs-table-hover-color);
-  --bs-table-bg-state: var(--bs-table-hover-bg);
-}
-
-    </style>
-  </head>
-  <body>
-    <div class="container-xxl">
-      <h1>Size Report for {{.pkgName}}</h1>
-
-      <p>How much space is used by Go packages, C libraries, and other bits to set up the program environment.</p>
-
-      <ul>
-        <li><strong>Code</strong> is the actual program code (machine code instructions).</li>
-        <li><strong>Read-only data</strong> are read-only global variables. On most microcontrollers, these are stored in flash and do not take up any RAM.</li>
-        <li><strong>Data</strong> are writable global variables with a non-zero initializer. On microcontrollers, they are copied from flash to RAM on reset.</li>
-        <li><strong>BSS</strong> are writable global variables that are zero initialized. They do not take up any space in the binary, but do take up RAM. On microcontrollers, this area is zeroed on reset.</li>
-      </ul>
-
-      <p>The binary size consists of code, read-only data, and data. On microcontrollers, this is exactly the size of the firmware image. On other systems, there is some extra overhead: binary metadata (headers of the ELF/MachO/COFF file), debug information, exception tables, symbol names, etc. Using <code>-no-debug</code> strips most of those.</p>
-
-      <h2>Program breakdown</h2>
-
-      <p>You can click on the rows below to see which files contribute to the binary size.</p>
-
-      <div class="table-responsive">
-        <table class="table w-auto">
-          <thead>
-            <tr>
-              <th>Package</th>
-              <th class="table-vertical-border">Code</th>
-              <th>Read-only data</th>
-              <th>Data</th>
-              <th title="zero-initialized data">BSS</th>
-              <th class="table-vertical-border" style="min-width: 16em">Binary size</th>
-            </tr>
-          </thead>
-          <tbody class="table-group-divider">
-            {{range $i, $pkg := .sizes}}
-            <tr class="row-package" data-collapse=".collapse-row-{{$i}}">
-              <td>{{.Name}}</td>
-              <td class="table-vertical-border">{{.Size.Code}}</td>
-              <td>{{.Size.ROData}}</td>
-              <td>{{.Size.Data}}</td>
-              <td>{{.Size.BSS}}</td>
-              <td class="table-vertical-border" style="background: linear-gradient(to right, var(--bs-info-bg-subtle) {{.Size.FlashPercent}}%, var(--bs-table-bg) {{.Size.FlashPercent}}%)">
-                {{.Size.Flash}}
-              </td>
-            </tr>
-            {{range $filename, $sizes := .Size.Sub}}
-            <tr class="table-secondary collapse collapse-row-{{$i}}">
-              <td class="ps-4">
-                {{if eq $filename ""}}
-                  (unknown file)
-                {{else}}
-                  {{$filename}}
-                {{end}}
-              </td>
-              <td class="table-vertical-border">{{$sizes.Code}}</td>
-              <td>{{$sizes.ROData}}</td>
-              <td>{{$sizes.Data}}</td>
-              <td>{{$sizes.BSS}}</td>
-              <td class="table-vertical-border" style="background: linear-gradient(to right, var(--bs-info-bg-subtle) {{$sizes.FlashPercent}}%, var(--bs-table-bg) {{$sizes.FlashPercent}}%)">
-                {{$sizes.Flash}}
-              </td>
-            </tr>
-            {{end}}
-            {{end}}
-          </tbody>
-          <tfoot class="table-group-divider">
-            <tr>
-              <th>Total</th>
-              <td class="table-vertical-border">{{.sizeTotal.code}}</td>
-              <td>{{.sizeTotal.rodata}}</td>
-              <td>{{.sizeTotal.data}}</td>
-              <td>{{.sizeTotal.bss}}</td>
-              <td class="table-vertical-border">{{.sizeTotal.flash}}</td>
-            </tr>
-          </tfoot>
-        </table>
-      </div>
-    </div>
-    <script>
-// Make table rows toggleable to show filenames.
-for (let clickable of document.querySelectorAll('.row-package')) {
-  clickable.addEventListener('click', e => {
-    for (let row of document.querySelectorAll(clickable.dataset.collapse)) {
-      row.classList.toggle('show');
-    }
-  });
-}
-    </script>
-  </body>
-</html>
@@ -12,7 +12,6 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"runtime"
 	"sort"
 	"strings"

@@ -25,7 +24,7 @@ const sizesDebug = false

 // programSize contains size statistics per package of a compiled program.
 type programSize struct {
-	Packages map[string]*packageSize
+	Packages map[string]packageSize
 	Code     uint64
 	ROData   uint64
 	Data     uint64
@@ -53,29 +52,13 @@ func (ps *programSize) RAM() uint64 {
 	return ps.Data + ps.BSS
 }

-// Return the package size information for a given package path, creating it if
-// it doesn't exist yet.
-func (ps *programSize) getPackage(path string) *packageSize {
-	if field, ok := ps.Packages[path]; ok {
-		return field
-	}
-	field := &packageSize{
-		Program: ps,
-		Sub:     map[string]*packageSize{},
-	}
-	ps.Packages[path] = field
-	return field
-}
-
 // packageSize contains the size of a package, calculated from the linked object
 // file.
 type packageSize struct {
-	Program *programSize
-	Code    uint64
-	ROData  uint64
-	Data    uint64
-	BSS     uint64
-	Sub     map[string]*packageSize
+	Code   uint64
+	ROData uint64
+	Data   uint64
+	BSS    uint64
 }

 // Flash usage in regular microcontrollers.
@@ -88,36 +71,10 @@ func (ps *packageSize) RAM() uint64 {
 	return ps.Data + ps.BSS
 }

-// Flash usage in regular microcontrollers, as a percentage of the total flash
-// usage of the program.
-func (ps *packageSize) FlashPercent() float64 {
-	return float64(ps.Flash()) / float64(ps.Program.Flash()) * 100
-}
-
-// Add a single size data point to this package.
-// This must only be called while calculating package size, not afterwards.
-func (ps *packageSize) addSize(getField func(*packageSize, bool) *uint64, filename string, size uint64, isVariable bool) {
-	if size == 0 {
-		return
-	}
-
-	// Add size for the package.
-	*getField(ps, isVariable) += size
-
-	// Add size for file inside package.
-	sub, ok := ps.Sub[filename]
-	if !ok {
-		sub = &packageSize{Program: ps.Program}
-		ps.Sub[filename] = sub
-	}
-	*getField(sub, isVariable) += size
-}
-
 // A mapping of a single chunk of code or data to a file path.
 type addressLine struct {
 	Address    uint64
 	Length     uint64 // length of this chunk
-	Align      uint64 // (maximum) alignment of this line
 	File       string // file path as stored in DWARF
 	IsVariable bool   // true if this is a variable (or constant), false if it is code
 }
@@ -129,7 +86,6 @@ type memorySection struct {
 	Type    memoryType
 	Address uint64
 	Size    uint64
-	Align   uint64
 }

 type memoryType int
@@ -161,13 +117,17 @@ var (
 	//   alloc:  heap allocations during init interpretation
 	//   pack:   data created when storing a constant in an interface for example
 	//   string: buffer behind strings
-	packageSymbolRegexp = regexp.MustCompile(`\$(alloc|pack|string)(\.[0-9]+)?$`)
+	packageSymbolRegexp = regexp.MustCompile(`\$(alloc|embedfsfiles|embedfsslice|embedslice|pack|string)(\.[0-9]+)?$`)
+
+	// Reflect sidetables. Created by the reflect lowering pass.
+	// See src/reflect/sidetables.go.
+	reflectDataRegexp = regexp.MustCompile(`^reflect\.[a-zA-Z]+Sidetable$`)
 )

 // readProgramSizeFromDWARF reads the source location for each line of code and
 // each variable in the program, as far as this is stored in the DWARF debug
 // information.
-func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64, skipTombstone bool) ([]addressLine, error) {
+func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset uint64, skipTombstone bool) ([]addressLine, error) {
 	r := data.Reader()
 	var lines []*dwarf.LineFile
 	var addresses []addressLine
@@ -236,22 +196,10 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 				if !prevLineEntry.EndSequence {
 					// The chunk describes the code from prevLineEntry to
 					// lineEntry.
-					path := prevLineEntry.File.Name
-					if runtime.GOOS == "windows" {
-						// Work around a Clang bug on Windows:
-						// https://github.com/llvm/llvm-project/issues/117317
-						path = strings.ReplaceAll(path, "\\\\", "\\")
-
-						// wasi-libc likes to use forward slashes, but we
-						// canonicalize everything to use backwards slashes as
-						// is common on Windows.
-						path = strings.ReplaceAll(path, "/", "\\")
-					}
 					line := addressLine{
 						Address: prevLineEntry.Address + codeOffset,
 						Length:  lineEntry.Address - prevLineEntry.Address,
-						Align:   codeAlignment,
-						File:    path,
+						File:    prevLineEntry.File.Name,
 					}
 					if line.Length != 0 {
 						addresses = append(addresses, line)
@@ -275,9 +223,20 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 			// Try to parse the location. While this could in theory be a very
 			// complex expression, usually it's just a DW_OP_addr opcode
 			// followed by an address.
-			addr, err := readDWARFConstant(r.AddressSize(), location.Val.([]uint8))
-			if err != nil {
-				continue // ignore the error, we don't know what to do with it
+			locationCode := location.Val.([]uint8)
+			if locationCode[0] != 3 { // DW_OP_addr
+				continue
+			}
+			var addr uint64
+			switch len(locationCode) {
+			case 1 + 2:
+				addr = uint64(binary.LittleEndian.Uint16(locationCode[1:]))
+			case 1 + 4:
+				addr = uint64(binary.LittleEndian.Uint32(locationCode[1:]))
+			case 1 + 8:
+				addr = binary.LittleEndian.Uint64(locationCode[1:])
+			default:
+				continue // unknown address
 			}

 			// Parse the type of the global variable, which (importantly)
@@ -288,16 +247,9 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 				return nil, err
 			}

-			// Read alignment, if it's stored as part of the debug information.
-			var alignment uint64
-			if attr := e.AttrField(dwarf.AttrAlignment); attr != nil {
-				alignment = uint64(attr.Val.(int64))
-			}
-
 			addresses = append(addresses, addressLine{
 				Address:    addr,
 				Length:     uint64(typ.Size()),
-				Align:      alignment,
 				File:       lines[file.Val.(int64)].Name,
 				IsVariable: true,
 			})
@@ -308,52 +260,6 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 	return addresses, nil
 }

-// Parse a DWARF constant. For addresses, this is usually a very simple
-// expression.
-func readDWARFConstant(addressSize int, bytecode []byte) (uint64, error) {
-	var addr uint64
-	for len(bytecode) != 0 {
-		op := bytecode[0]
-		bytecode = bytecode[1:]
-		switch op {
-		case 0x03: // DW_OP_addr
-			switch addressSize {
-			case 2:
-				addr = uint64(binary.LittleEndian.Uint16(bytecode))
-			case 4:
-				addr = uint64(binary.LittleEndian.Uint32(bytecode))
-			case 8:
-				addr = binary.LittleEndian.Uint64(bytecode)
-			default:
-				panic("unexpected address size")
-			}
-			bytecode = bytecode[addressSize:]
-		case 0x23: // DW_OP_plus_uconst
-			offset, n := readULEB128(bytecode)
-			addr += offset
-			bytecode = bytecode[n:]
-		default:
-			return 0, fmt.Errorf("unknown DWARF opcode: 0x%x", op)
-		}
-	}
-	return addr, nil
-}
-
-// Source: https://en.wikipedia.org/wiki/LEB128#Decode_unsigned_integer
-func readULEB128(buf []byte) (result uint64, n int) {
-	var shift uint8
-	for {
-		b := buf[n]
-		n++
-		result |= uint64(b&0x7f) << shift
-		if b&0x80 == 0 {
-			break
-		}
-		shift += 7
-	}
-	return
-}
-
 // Read a MachO object file and return a line table.
 // Also return an index from symbol name to start address in the line table.
 func readMachOSymbolAddresses(path string) (map[string]int, []addressLine, error) {
@@ -375,7 +281,7 @@ func readMachOSymbolAddresses(path string) (map[string]int, []addressLine, error
 	if err != nil {
 		return nil, nil, err
 	}
-	lines, err := readProgramSizeFromDWARF(dwarf, 0, 0, false)
+	lines, err := readProgramSizeFromDWARF(dwarf, 0, false)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -432,15 +338,10 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 	// Load the binary file, which could be in a number of file formats.
 	var sections []memorySection
 	if file, err := elf.NewFile(f); err == nil {
-		var codeAlignment uint64
-		switch file.Machine {
-		case elf.EM_ARM:
-			codeAlignment = 4 // usually 2, but can be 4
-		}
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, 0, codeAlignment, true)
+			addresses, err = readProgramSizeFromDWARF(data, 0, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -474,7 +375,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 			if section.Flags&elf.SHF_ALLOC == 0 {
 				continue
 			}
-			if packageSymbolRegexp.MatchString(symbol.Name) || symbol.Name == "__isr_vector" {
+			if packageSymbolRegexp.MatchString(symbol.Name) || reflectDataRegexp.MatchString(symbol.Name) {
 				addresses = append(addresses, addressLine{
 					Address:    symbol.Value,
 					Length:     symbol.Size,
@@ -498,7 +399,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 					sections = append(sections, memorySection{
 						Address: section.Addr,
 						Size:    section.Size,
-						Align:   section.Addralign,
 						Type:    memoryStack,
 					})
 				} else {
@@ -506,7 +406,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 					sections = append(sections, memorySection{
 						Address: section.Addr,
 						Size:    section.Size,
-						Align:   section.Addralign,
 						Type:    memoryBSS,
 					})
 				}
@@ -515,7 +414,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryCode,
 				})
 			} else if section.Type == elf.SHT_PROGBITS && section.Flags&elf.SHF_WRITE != 0 {
@@ -523,7 +421,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryData,
 				})
 			} else if section.Type == elf.SHT_PROGBITS {
@@ -531,7 +428,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryROData,
 				})
 			}
@@ -558,7 +454,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryCode,
 				})
 			} else if sectionType == 1 { // S_ZEROFILL
@@ -566,7 +461,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryBSS,
 				})
 			} else if segment.Maxprot&0b011 == 0b001 { // --r (read-only data)
@@ -574,7 +468,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryROData,
 				})
 			} else {
@@ -582,7 +475,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryData,
 				})
 			}
@@ -666,7 +558,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, 0, 0, true)
+			addresses, err = readProgramSizeFromDWARF(data, 0, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -738,7 +630,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, codeOffset, 0, true)
+			addresses, err = readProgramSizeFromDWARF(data, codeOffset, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -826,40 +718,49 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz

 	// Now finally determine the binary/RAM size usage per package by going
 	// through each allocated section.
-	sizes := make(map[string]*packageSize)
-	program := &programSize{
-		Packages: sizes,
-	}
+	sizes := make(map[string]packageSize)
 	for _, section := range sections {
 		switch section.Type {
 		case memoryCode:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
 				if isVariable {
-					return &ps.ROData
+					field.ROData += size
+				} else {
+					field.Code += size
 				}
-				return &ps.Code
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryROData:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.ROData
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.ROData += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryData:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.Data
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.Data += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryBSS:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.BSS
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.BSS += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryStack:
 			// We store the C stack as a pseudo-package.
-			program.getPackage("C stack").addSize(func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.BSS
-			}, "", section.Size, false)
+			sizes["C stack"] = packageSize{
+				BSS: section.Size,
+			}
 		}
 	}

 	// ...and summarize the results.
+	program := &programSize{
+		Packages: sizes,
+	}
 	for _, pkg := range sizes {
 		program.Code += pkg.Code
 		program.ROData += pkg.ROData
@@ -870,8 +771,8 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 }

 // readSection determines for each byte in this section to which package it
-// belongs.
-func readSection(section memorySection, addresses []addressLine, program *programSize, getField func(*packageSize, bool) *uint64, packagePathMap map[string]string) {
+// belongs. It reports this usage through the addSize callback.
+func readSection(section memorySection, addresses []addressLine, addSize func(string, uint64, bool), packagePathMap map[string]string) {
 	// The addr variable tracks at which address we are while going through this
 	// section. We start at the beginning.
 	addr := section.Address
@@ -889,18 +790,10 @@ func readSection(section memorySection, addresses []addressLine, program *progra
 		if addr < line.Address {
 			// There is a gap: there is a space between the current and the
 			// previous line entry.
-			// Check whether this is caused by alignment requirements.
-			addrAligned := (addr + line.Align - 1) &^ (line.Align - 1)
-			if line.Align > 1 && addrAligned >= line.Address {
-				// It is, assume that's what causes the gap.
-				program.getPackage("(padding)").addSize(getField, "", line.Address-addr, true)
-			} else {
-				program.getPackage("(unknown)").addSize(getField, "", line.Address-addr, false)
-				if sizesDebug {
-					fmt.Printf("%08x..%08x %5d:  unknown (gap), alignment=%d\n", addr, line.Address, line.Address-addr, line.Align)
-				}
+			addSize("(unknown)", line.Address-addr, false)
+			if sizesDebug {
+				fmt.Printf("%08x..%08x %5d:  unknown (gap)\n", addr, line.Address, line.Address-addr)
 			}
-			addr = line.Address
 		}
 		if addr > line.Address+line.Length {
 			// The current line is already covered by a previous line entry.
@@ -917,54 +810,35 @@ func readSection(section memorySection, addresses []addressLine, program *progra
 			length = line.Length - (addr - line.Address)
 		}
 		// Finally, mark this chunk of memory as used by the given package.
-		packagePath, filename := findPackagePath(line.File, packagePathMap)
-		program.getPackage(packagePath).addSize(getField, filename, length, line.IsVariable)
+		addSize(findPackagePath(line.File, packagePathMap), length, line.IsVariable)
 		addr = line.Address + line.Length
 	}
 	if addr < sectionEnd {
 		// There is a gap at the end of the section.
-		addrAligned := (addr + section.Align - 1) &^ (section.Align - 1)
-		if section.Align > 1 && addrAligned >= sectionEnd {
-			// The gap is caused by the section alignment.
-			// For example, if a .rodata section ends with a non-aligned string.
-			program.getPackage("(padding)").addSize(getField, "", sectionEnd-addr, true)
-		} else {
-			program.getPackage("(unknown)").addSize(getField, "", sectionEnd-addr, false)
-			if sizesDebug {
-				fmt.Printf("%08x..%08x %5d:  unknown (end), alignment=%d\n", addr, sectionEnd, sectionEnd-addr, section.Align)
-			}
+		addSize("(unknown)", sectionEnd-addr, false)
+		if sizesDebug {
+			fmt.Printf("%08x..%08x %5d:  unknown (end)\n", addr, sectionEnd, sectionEnd-addr)
 		}
 	}
 }

 // findPackagePath returns the Go package (or a pseudo package) for the given
 // path. It uses some heuristics, for example for some C libraries.
-func findPackagePath(path string, packagePathMap map[string]string) (packagePath, filename string) {
+func findPackagePath(path string, packagePathMap map[string]string) string {
 	// Check whether this path is part of one of the compiled packages.
 	packagePath, ok := packagePathMap[filepath.Dir(path)]
-	if ok {
-		// Directory is known as a Go package.
-		// Add the file itself as well.
-		filename = filepath.Base(path)
-	} else {
+	if !ok {
 		if strings.HasPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")) {
 			// Emit C libraries (in the lib subdirectory of TinyGo) as a single
-			// package, with a "C" prefix. For example: "C picolibc" for the
-			// baremetal libc.
-			libPath := strings.TrimPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")+string(os.PathSeparator))
-			parts := strings.SplitN(libPath, string(os.PathSeparator), 2)
-			packagePath = "C " + parts[0]
-			filename = parts[1]
-		} else if prefix := filepath.Join(goenv.Get("TINYGOROOT"), "llvm-project", "compiler-rt"); strings.HasPrefix(path, prefix) {
-			packagePath = "C compiler-rt"
-			filename = strings.TrimPrefix(path, prefix+string(os.PathSeparator))
+			// package, with a "C" prefix. For example: "C compiler-rt" for the
+			// compiler runtime library from LLVM.
+			packagePath = "C " + strings.Split(strings.TrimPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")), string(os.PathSeparator))[1]
 		} else if packageSymbolRegexp.MatchString(path) {
 			// Parse symbol names like main$alloc or runtime$string.
 			packagePath = path[:strings.LastIndex(path, "$")]
-		} else if path == "__isr_vector" {
-			packagePath = "C interrupt vector"
-		} else if path == "<Go type>" {
-			packagePath = "Go types"
+		} else if reflectDataRegexp.MatchString(path) {
+			// Parse symbol names like reflect.structTypesSidetable.
+			packagePath = "Go reflect data"
 		} else if path == "<Go interface assert>" {
 			// Interface type assert, generated by the interface lowering pass.
 			packagePath = "Go interface assert"
@@ -980,11 +854,9 @@ func findPackagePath(path string, packagePathMap map[string]string) (packagePath
 			// fixed in the compiler.
 			packagePath = "-"
 		} else {
-			// This is some other path. Not sure what it is, so just emit its
-			// directory as a fallback.
-			packagePath = filepath.Dir(path)
-			filename = filepath.Base(path)
+			// This is some other path. Not sure what it is, so just emit its directory.
+			packagePath = filepath.Dir(path) // fallback
 		}
 	}
-	return
+	return packagePath
 }
@@ -1,140 +0,0 @@
-package builder
-
-import (
-	"regexp"
-	"runtime"
-	"testing"
-	"time"
-
-	"github.com/tinygo-org/tinygo/compileopts"
-)
-
-var sema = make(chan struct{}, runtime.NumCPU())
-
-type sizeTest struct {
-	target     string
-	path       string
-	codeSize   uint64
-	rodataSize uint64
-	dataSize   uint64
-	bssSize    uint64
-}
-
-// Test whether code and data size is as expected for the given targets.
-// This tests both the logic of loadProgramSize and checks that code size
-// doesn't change unintentionally.
-//
-// If you find that code or data size is reduced, then great! You can reduce the
-// number in this test.
-// If you find that the code or data size is increased, take a look as to why
-// this is. It could be due to an update (LLVM version, Go version, etc) which
-// is fine, but it could also mean that a recent change introduced this size
-// increase. If so, please consider whether this new feature is indeed worth the
-// size increase for all users.
-func TestBinarySize(t *testing.T) {
-	if runtime.GOOS == "linux" && !hasBuiltinTools {
-		// Debian LLVM packages are modified a bit and tend to produce
-		// different machine code. Ideally we'd fix this (with some attributes
-		// or something?), but for now skip it.
-		t.Skip("Skip: using external LLVM version so binary size might differ")
-	}
-
-	// This is a small number of very diverse targets that we want to test.
-	tests := []sizeTest{
-		// microcontrollers
-		{"hifive1b", "examples/echo", 4560, 280, 0, 2268},
-		{"microbit", "examples/serial", 2924, 388, 8, 2272},
-		{"wioterminal", "examples/pininterrupt", 7383, 1489, 116, 6912},
-
-		// TODO: also check wasm. Right now this is difficult, because
-		// wasm binaries are run through wasm-opt and therefore the
-		// output varies by binaryen version.
-	}
-	for _, tc := range tests {
-		tc := tc
-		t.Run(tc.target+"/"+tc.path, func(t *testing.T) {
-			t.Parallel()
-
-			// Build the binary.
-			result := buildBinary(t, tc.target, tc.path)
-
-			// Check whether the size of the binary matches the expected size.
-			sizes, err := loadProgramSize(result.Executable, nil)
-			if err != nil {
-				t.Fatal("could not read program size:", err)
-			}
-			if sizes.Code != tc.codeSize || sizes.ROData != tc.rodataSize || sizes.Data != tc.dataSize || sizes.BSS != tc.bssSize {
-				t.Errorf("Unexpected code size when compiling: -target=%s %s", tc.target, tc.path)
-				t.Errorf("            code rodata   data    bss")
-				t.Errorf("expected: %6d %6d %6d %6d", tc.codeSize, tc.rodataSize, tc.dataSize, tc.bssSize)
-				t.Errorf("actual:   %6d %6d %6d %6d", sizes.Code, sizes.ROData, sizes.Data, sizes.BSS)
-			}
-		})
-	}
-}
-
-// Check that the -size=full flag attributes binary size to the correct package
-// without filesystem paths and things like that.
-func TestSizeFull(t *testing.T) {
-	tests := []string{
-		"microbit",
-		"wasip1",
-	}
-
-	libMatch := regexp.MustCompile(`^C [a-z -]+$`) // example: "C interrupt vector"
-	pkgMatch := regexp.MustCompile(`^[a-z/]+$`)    // example: "internal/task"
-
-	for _, target := range tests {
-		target := target
-		t.Run(target, func(t *testing.T) {
-			t.Parallel()
-
-			// Build the binary.
-			result := buildBinary(t, target, "examples/serial")
-
-			// Check whether the binary doesn't contain any unexpected package
-			// names.
-			sizes, err := loadProgramSize(result.Executable, result.PackagePathMap)
-			if err != nil {
-				t.Fatal("could not read program size:", err)
-			}
-			for _, pkg := range sizes.sortedPackageNames() {
-				if pkg == "(padding)" || pkg == "(unknown)" {
-					// TODO: correctly attribute all unknown binary size.
-					continue
-				}
-				if libMatch.MatchString(pkg) {
-					continue
-				}
-				if pkgMatch.MatchString(pkg) {
-					continue
-				}
-				t.Error("unexpected package name in size output:", pkg)
-			}
-		})
-	}
-}
-
-func buildBinary(t *testing.T, targetString, pkgName string) BuildResult {
-	options := compileopts.Options{
-		Target:        targetString,
-		Opt:           "z",
-		Semaphore:     sema,
-		InterpTimeout: 60 * time.Second,
-		Debug:         true,
-		VerifyIR:      true,
-	}
-	target, err := compileopts.LoadTarget(&options)
-	if err != nil {
-		t.Fatal("could not load target:", err)
-	}
-	config := &compileopts.Config{
-		Options: &options,
-		Target:  target,
-	}
-	result, err := Build(pkgName, "", t.TempDir(), config)
-	if err != nil {
-		t.Fatal("could not build:", err)
-	}
-	return result
-}
@@ -1,4 +1,5 @@
 //go:build byollvm
+// +build byollvm

 package builder

@@ -12,7 +13,10 @@ import (
 #include <stdbool.h>
 #include <stdlib.h>
 bool tinygo_clang_driver(int argc, char **argv);
-bool tinygo_link(int argc, char **argv);
+bool tinygo_link_elf(int argc, char **argv);
+bool tinygo_link_macho(int argc, char **argv);
+bool tinygo_link_mingw(int argc, char **argv);
+bool tinygo_link_wasm(int argc, char **argv);
 */
 import "C"

@@ -23,7 +27,16 @@ const hasBuiltinTools = true
 // This version actually runs the tools because TinyGo was compiled while
 // linking statically with LLVM (with the byollvm build tag).
 func RunTool(tool string, args ...string) error {
-	args = append([]string{tool}, args...)
+	linker := "elf"
+	if tool == "ld.lld" && len(args) >= 2 {
+		if args[0] == "-m" && args[1] == "i386pep" {
+			linker = "mingw"
+		} else if args[0] == "-flavor" {
+			linker = args[1]
+			args = args[2:]
+		}
+	}
+	args = append([]string{"tinygo:" + tool}, args...)

 	var cflag *C.char
 	buf := C.calloc(C.size_t(len(args)), C.size_t(unsafe.Sizeof(cflag)))
@@ -39,8 +52,19 @@ func RunTool(tool string, args ...string) error {
 	switch tool {
 	case "clang":
 		ok = C.tinygo_clang_driver(C.int(len(args)), (**C.char)(buf))
-	case "ld.lld", "wasm-ld":
-		ok = C.tinygo_link(C.int(len(args)), (**C.char)(buf))
+	case "ld.lld":
+		switch linker {
+		case "darwin":
+			ok = C.tinygo_link_macho(C.int(len(args)), (**C.char)(buf))
+		case "elf":
+			ok = C.tinygo_link_elf(C.int(len(args)), (**C.char)(buf))
+		case "mingw":
+			ok = C.tinygo_link_mingw(C.int(len(args)), (**C.char)(buf))
+		default:
+			return errors.New("unknown linker: " + linker)
+		}
+	case "wasm-ld":
+		ok = C.tinygo_link_wasm(C.int(len(args)), (**C.char)(buf))
 	default:
 		return errors.New("unknown tool: " + tool)
 	}
@@ -1,4 +1,5 @@
 //go:build !byollvm
+// +build !byollvm

 package builder

@@ -1,191 +1,50 @@
 package builder

 import (
-	"bytes"
-	"fmt"
-	"go/scanner"
-	"go/token"
+	"errors"
 	"os"
 	"os/exec"
-	"regexp"
-	"strconv"
-	"strings"
+
+	"github.com/tinygo-org/tinygo/goenv"
 )

 // runCCompiler invokes a C compiler with the given arguments.
 func runCCompiler(flags ...string) error {
-	// Find the right command to run Clang.
-	var cmd *exec.Cmd
 	if hasBuiltinTools {
 		// Compile this with the internal Clang compiler.
-		cmd = exec.Command(os.Args[0], append([]string{"clang"}, flags...)...)
-	} else {
-		// Compile this with an external invocation of the Clang compiler.
-		name, err := LookupCommand("clang")
-		if err != nil {
-			return err
+		headerPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
+		if headerPath == "" {
+			return errors.New("could not locate Clang headers")
 		}
-		cmd = exec.Command(name, flags...)
+		flags = append(flags, "-I"+headerPath)
+		cmd := exec.Command(os.Args[0], append([]string{"clang"}, flags...)...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		return cmd.Run()
 	}

-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-
-	// Make sure the command doesn't use any environmental variables.
-	// Most importantly, it should not use C_INCLUDE_PATH and the like.
-	cmd.Env = []string{}
-
-	// Let some environment variables through. One important one is the
-	// temporary directory, especially on Windows it looks like Clang breaks if
-	// the temporary directory has not been set.
-	// See: https://github.com/tinygo-org/tinygo/issues/4557
-	// Also see: https://github.com/llvm/llvm-project/blob/release/18.x/llvm/lib/Support/Unix/Path.inc#L1435
-	for _, env := range os.Environ() {
-		// We could parse the key and look it up in a map, but since there are
-		// only a few keys iterating through them is easier and maybe even
-		// faster.
-		for _, prefix := range []string{"TMPDIR=", "TMP=", "TEMP=", "TEMPDIR="} {
-			if strings.HasPrefix(env, prefix) {
-				cmd.Env = append(cmd.Env, env)
-				break
-			}
-		}
-	}
-
-	return cmd.Run()
+	// Compile this with an external invocation of the Clang compiler.
+	return execCommand("clang", flags...)
 }

 // link invokes a linker with the given name and flags.
 func link(linker string, flags ...string) error {
-	// We only support LLD.
-	if linker != "ld.lld" && linker != "wasm-ld" {
-		return fmt.Errorf("unexpected: linker %s should be ld.lld or wasm-ld", linker)
+	if hasBuiltinTools && (linker == "ld.lld" || linker == "wasm-ld") {
+		// Run command with internal linker.
+		cmd := exec.Command(os.Args[0], append([]string{linker}, flags...)...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		return cmd.Run()
 	}

-	var cmd *exec.Cmd
-	if hasBuiltinTools {
-		cmd = exec.Command(os.Args[0], append([]string{linker}, flags...)...)
-	} else {
-		name, err := LookupCommand(linker)
-		if err != nil {
-			return err
-		}
-		cmd = exec.Command(name, flags...)
+	// Fall back to external command.
+	if _, ok := commands[linker]; ok {
+		return execCommand(linker, flags...)
 	}
-	var buf bytes.Buffer
+
+	cmd := exec.Command(linker, flags...)
 	cmd.Stdout = os.Stdout
-	cmd.Stderr = &buf
-	err := cmd.Run()
-	if err != nil {
-		if buf.Len() == 0 {
-			// The linker failed but there was no output.
-			// Therefore, show some output anyway.
-			return fmt.Errorf("failed to run linker: %w", err)
-		}
-		return parseLLDErrors(buf.String())
-	}
-	return nil
-}
-
-// Split LLD errors into individual erros (including errors that continue on the
-// next line, using a ">>>" prefix). If possible, replace the raw errors with a
-// more user-friendly version (and one that's more in a Go style).
-func parseLLDErrors(text string) error {
-	// Split linker output in separate error messages.
-	lines := strings.Split(text, "\n")
-	var errorLines []string // one or more line (belonging to a single error) per line
-	for _, line := range lines {
-		line = strings.TrimRight(line, "\r") // needed for Windows
-		if len(errorLines) != 0 && strings.HasPrefix(line, ">>> ") {
-			errorLines[len(errorLines)-1] += "\n" + line
-			continue
-		}
-		if line == "" {
-			continue
-		}
-		errorLines = append(errorLines, line)
-	}
-
-	// Parse error messages.
-	var linkErrors []error
-	var flashOverflow, ramOverflow uint64
-	for _, message := range errorLines {
-		parsedError := false
-
-		// Check for undefined symbols.
-		// This can happen in some cases like with CGo and //go:linkname tricker.
-		if matches := regexp.MustCompile(`^ld.lld(-[0-9]+)?: error: undefined symbol: (.*)\n`).FindStringSubmatch(message); matches != nil {
-			symbolName := matches[2]
-			for _, line := range strings.Split(message, "\n") {
-				matches := regexp.MustCompile(`referenced by .* \(((.*):([0-9]+))\)`).FindStringSubmatch(line)
-				if matches != nil {
-					parsedError = true
-					line, _ := strconv.Atoi(matches[3])
-					// TODO: detect common mistakes like -gc=none?
-					linkErrors = append(linkErrors, scanner.Error{
-						Pos: token.Position{
-							Filename: matches[2],
-							Line:     line,
-						},
-						Msg: "linker could not find symbol " + symbolName,
-					})
-				}
-			}
-		}
-
-		// Check for flash/RAM overflow.
-		if matches := regexp.MustCompile(`^ld.lld(-[0-9]+)?: error: section '(.*?)' will not fit in region '(.*?)': overflowed by ([0-9]+) bytes$`).FindStringSubmatch(message); matches != nil {
-			region := matches[3]
-			n, err := strconv.ParseUint(matches[4], 10, 64)
-			if err != nil {
-				// Should not happen at all (unless it overflows an uint64 for some reason).
-				continue
-			}
-
-			// Check which area overflowed.
-			// Some chips use differently named memory areas, but these are by
-			// far the most common.
-			switch region {
-			case "FLASH_TEXT":
-				if n > flashOverflow {
-					flashOverflow = n
-				}
-				parsedError = true
-			case "RAM":
-				if n > ramOverflow {
-					ramOverflow = n
-				}
-				parsedError = true
-			}
-		}
-
-		// If we couldn't parse the linker error: show the error as-is to
-		// the user.
-		if !parsedError {
-			linkErrors = append(linkErrors, LinkerError{message})
-		}
-	}
-
-	if flashOverflow > 0 {
-		linkErrors = append(linkErrors, LinkerError{
-			Msg: fmt.Sprintf("program too large for this chip (flash overflowed by %d bytes)\n\toptimization guide: https://tinygo.org/docs/guides/optimizing-binaries/", flashOverflow),
-		})
-	}
-	if ramOverflow > 0 {
-		linkErrors = append(linkErrors, LinkerError{
-			Msg: fmt.Sprintf("program uses too much static RAM on this chip (RAM overflowed by %d bytes)", ramOverflow),
-		})
-	}
-
-	return newMultiError(linkErrors, "")
-}
-
-// LLD linker error that could not be parsed or doesn't refer to a source
-// location.
-type LinkerError struct {
-	Msg string
-}
-
-func (e LinkerError) Error() string {
-	return e.Msg
+	cmd.Stderr = os.Stderr
+	cmd.Dir = goenv.Get("TINYGOROOT")
+	return cmd.Run()
 }
@@ -1,278 +0,0 @@
-package builder
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var libWasiLibc = Library{
-	name: "wasi-libc",
-	makeHeaders: func(target, includeDir string) error {
-		bits := filepath.Join(includeDir, "bits")
-		err := os.Mkdir(bits, 0777)
-		if err != nil {
-			return err
-		}
-
-		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "wasi-libc/libc-top-half/musl")
-		err = buildMuslAllTypes("wasm32", muslDir, bits)
-		if err != nil {
-			return err
-		}
-
-		// See MUSL_OMIT_HEADERS in the Makefile.
-		omitHeaders := map[string]struct{}{
-			"syslog.h":   {},
-			"wait.h":     {},
-			"ucontext.h": {},
-			"paths.h":    {},
-			"utmp.h":     {},
-			"utmpx.h":    {},
-			"lastlog.h":  {},
-			"elf.h":      {},
-			"link.h":     {},
-			"pwd.h":      {},
-			"shadow.h":   {},
-			"grp.h":      {},
-			"mntent.h":   {},
-			"netdb.h":    {},
-			"resolv.h":   {},
-			"pty.h":      {},
-			"dlfcn.h":    {},
-			"setjmp.h":   {},
-			"ulimit.h":   {},
-			"wordexp.h":  {},
-			"spawn.h":    {},
-			"termios.h":  {},
-			"libintl.h":  {},
-			"aio.h":      {},
-
-			"stdarg.h": {},
-			"stddef.h": {},
-
-			"pthread.h": {},
-		}
-
-		for _, glob := range [][2]string{
-			{"libc-bottom-half/headers/public/*.h", ""},
-			{"libc-bottom-half/headers/public/wasi/*.h", "wasi"},
-			{"libc-top-half/musl/arch/wasm32/bits/*.h", "bits"},
-			{"libc-top-half/musl/include/*.h", ""},
-			{"libc-top-half/musl/include/netinet/*.h", "netinet"},
-			{"libc-top-half/musl/include/sys/*.h", "sys"},
-		} {
-			matches, _ := filepath.Glob(filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc", glob[0]))
-			outDir := filepath.Join(includeDir, glob[1])
-			os.MkdirAll(outDir, 0o777)
-			for _, match := range matches {
-				name := filepath.Base(match)
-				if _, ok := omitHeaders[name]; ok {
-					continue
-				}
-				data, err := os.ReadFile(match)
-				if err != nil {
-					return err
-				}
-				err = os.WriteFile(filepath.Join(outDir, name), data, 0o666)
-				if err != nil {
-					return err
-				}
-			}
-		}
-
-		return nil
-	},
-	cflags: func(target, headerPath string) []string {
-		libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-		return []string{
-			"-Werror",
-			"-Wall",
-			"-std=gnu11",
-			"-nostdlibinc",
-			"-mnontrapping-fptoint", "-msign-ext",
-			"-Wno-null-pointer-arithmetic", "-Wno-unused-parameter", "-Wno-sign-compare", "-Wno-unused-variable", "-Wno-unused-function", "-Wno-ignored-attributes", "-Wno-missing-braces", "-Wno-ignored-pragmas", "-Wno-unused-but-set-variable", "-Wno-unknown-warning-option",
-			"-Wno-parentheses", "-Wno-shift-op-parentheses", "-Wno-bitwise-op-parentheses", "-Wno-logical-op-parentheses", "-Wno-string-plus-int", "-Wno-dangling-else", "-Wno-unknown-pragmas",
-			"-DNDEBUG",
-			"-D__wasilibc_printscan_no_long_double",
-			"-D__wasilibc_printscan_full_support_option=\"long double support is disabled\"",
-			"-isystem", headerPath,
-			"-I" + libcDir + "/libc-top-half/musl/src/include",
-			"-I" + libcDir + "/libc-top-half/musl/src/internal",
-			"-I" + libcDir + "/libc-top-half/musl/arch/wasm32",
-			"-I" + libcDir + "/libc-top-half/musl/arch/generic",
-			"-I" + libcDir + "/libc-top-half/headers/private",
-		}
-	},
-	cflagsForFile: func(path string) []string {
-		if strings.HasPrefix(path, "libc-bottom-half"+string(os.PathSeparator)) {
-			libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-			return []string{
-				"-I" + libcDir + "/libc-bottom-half/headers/private",
-				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src/include",
-				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src",
-			}
-		}
-		return nil
-	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
-	librarySources: func(target string) ([]string, error) {
-		type filePattern struct {
-			glob    string
-			exclude []string
-		}
-
-		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
-		globs := []filePattern{
-			// Top half: mostly musl sources.
-			{glob: "libc-top-half/sources/*.c"},
-			{glob: "libc-top-half/musl/src/conf/*.c"},
-			{glob: "libc-top-half/musl/src/internal/*.c", exclude: []string{
-				"procfdname.c", "syscall.c", "syscall_ret.c", "vdso.c", "version.c",
-			}},
-			{glob: "libc-top-half/musl/src/locale/*.c", exclude: []string{
-				"dcngettext.c", "textdomain.c", "bind_textdomain_codeset.c"}},
-			{glob: "libc-top-half/musl/src/math/*.c", exclude: []string{
-				"__signbit.c", "__signbitf.c", "__signbitl.c",
-				"__fpclassify.c", "__fpclassifyf.c", "__fpclassifyl.c",
-				"ceilf.c", "ceil.c",
-				"floorf.c", "floor.c",
-				"truncf.c", "trunc.c",
-				"rintf.c", "rint.c",
-				"nearbyintf.c", "nearbyint.c",
-				"sqrtf.c", "sqrt.c",
-				"fabsf.c", "fabs.c",
-				"copysignf.c", "copysign.c",
-				"fminf.c", "fmaxf.c",
-				"fmin.c", "fmax.c,",
-			}},
-			{glob: "libc-top-half/musl/src/multibyte/*.c"},
-			{glob: "libc-top-half/musl/src/stdio/*.c", exclude: []string{
-				"vfwscanf.c", "vfwprintf.c", // long double is unsupported
-				"__lockfile.c", "flockfile.c", "funlockfile.c", "ftrylockfile.c",
-				"rename.c",
-				"tmpnam.c", "tmpfile.c", "tempnam.c",
-				"popen.c", "pclose.c",
-				"remove.c",
-				"gets.c"}},
-			{glob: "libc-top-half/musl/src/stdlib/*.c"},
-			{glob: "libc-top-half/musl/src/string/*.c", exclude: []string{
-				"strsignal.c"}},
-
-			// Bottom half: connect top half to WASI equivalents.
-			{glob: "libc-bottom-half/cloudlibc/src/libc/*/*.c"},
-			{glob: "libc-bottom-half/cloudlibc/src/libc/sys/*/*.c"},
-			{glob: "libc-bottom-half/sources/*.c"},
-		}
-
-		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
-		sources := []string{
-			"libc-top-half/musl/src/misc/a64l.c",
-			"libc-top-half/musl/src/misc/basename.c",
-			"libc-top-half/musl/src/misc/dirname.c",
-			"libc-top-half/musl/src/misc/ffs.c",
-			"libc-top-half/musl/src/misc/ffsl.c",
-			"libc-top-half/musl/src/misc/ffsll.c",
-			"libc-top-half/musl/src/misc/fmtmsg.c",
-			"libc-top-half/musl/src/misc/getdomainname.c",
-			"libc-top-half/musl/src/misc/gethostid.c",
-			"libc-top-half/musl/src/misc/getopt.c",
-			"libc-top-half/musl/src/misc/getopt_long.c",
-			"libc-top-half/musl/src/misc/getsubopt.c",
-			"libc-top-half/musl/src/misc/uname.c",
-			"libc-top-half/musl/src/misc/nftw.c",
-			"libc-top-half/musl/src/errno/strerror.c",
-			"libc-top-half/musl/src/network/htonl.c",
-			"libc-top-half/musl/src/network/htons.c",
-			"libc-top-half/musl/src/network/ntohl.c",
-			"libc-top-half/musl/src/network/ntohs.c",
-			"libc-top-half/musl/src/network/inet_ntop.c",
-			"libc-top-half/musl/src/network/inet_pton.c",
-			"libc-top-half/musl/src/network/inet_aton.c",
-			"libc-top-half/musl/src/network/in6addr_any.c",
-			"libc-top-half/musl/src/network/in6addr_loopback.c",
-			"libc-top-half/musl/src/fenv/fenv.c",
-			"libc-top-half/musl/src/fenv/fesetround.c",
-			"libc-top-half/musl/src/fenv/feupdateenv.c",
-			"libc-top-half/musl/src/fenv/fesetexceptflag.c",
-			"libc-top-half/musl/src/fenv/fegetexceptflag.c",
-			"libc-top-half/musl/src/fenv/feholdexcept.c",
-			"libc-top-half/musl/src/exit/exit.c",
-			"libc-top-half/musl/src/exit/atexit.c",
-			"libc-top-half/musl/src/exit/assert.c",
-			"libc-top-half/musl/src/exit/quick_exit.c",
-			"libc-top-half/musl/src/exit/at_quick_exit.c",
-			"libc-top-half/musl/src/time/strftime.c",
-			"libc-top-half/musl/src/time/asctime.c",
-			"libc-top-half/musl/src/time/asctime_r.c",
-			"libc-top-half/musl/src/time/ctime.c",
-			"libc-top-half/musl/src/time/ctime_r.c",
-			"libc-top-half/musl/src/time/wcsftime.c",
-			"libc-top-half/musl/src/time/strptime.c",
-			"libc-top-half/musl/src/time/difftime.c",
-			"libc-top-half/musl/src/time/timegm.c",
-			"libc-top-half/musl/src/time/ftime.c",
-			"libc-top-half/musl/src/time/gmtime.c",
-			"libc-top-half/musl/src/time/gmtime_r.c",
-			"libc-top-half/musl/src/time/timespec_get.c",
-			"libc-top-half/musl/src/time/getdate.c",
-			"libc-top-half/musl/src/time/localtime.c",
-			"libc-top-half/musl/src/time/localtime_r.c",
-			"libc-top-half/musl/src/time/mktime.c",
-			"libc-top-half/musl/src/time/__tm_to_secs.c",
-			"libc-top-half/musl/src/time/__month_to_secs.c",
-			"libc-top-half/musl/src/time/__secs_to_tm.c",
-			"libc-top-half/musl/src/time/__year_to_secs.c",
-			"libc-top-half/musl/src/time/__tz.c",
-			"libc-top-half/musl/src/fcntl/creat.c",
-			"libc-top-half/musl/src/dirent/alphasort.c",
-			"libc-top-half/musl/src/dirent/versionsort.c",
-			"libc-top-half/musl/src/env/__stack_chk_fail.c",
-			"libc-top-half/musl/src/env/clearenv.c",
-			"libc-top-half/musl/src/env/getenv.c",
-			"libc-top-half/musl/src/env/putenv.c",
-			"libc-top-half/musl/src/env/setenv.c",
-			"libc-top-half/musl/src/env/unsetenv.c",
-			"libc-top-half/musl/src/unistd/posix_close.c",
-			"libc-top-half/musl/src/stat/futimesat.c",
-			"libc-top-half/musl/src/legacy/getpagesize.c",
-			"libc-top-half/musl/src/thread/thrd_sleep.c",
-		}
-
-		basepath := goenv.Get("TINYGOROOT") + "/lib/wasi-libc/"
-		for _, pattern := range globs {
-			matches, err := filepath.Glob(basepath + pattern.glob)
-			if err != nil {
-				// From the documentation:
-				// > Glob ignores file system errors such as I/O errors reading
-				// > directories. The only possible returned error is
-				// > ErrBadPattern, when pattern is malformed.
-				// So the only possible error is when the (statically defined)
-				// pattern is wrong. In other words, a programming bug.
-				return nil, fmt.Errorf("wasi-libc: could not glob source dirs: %w", err)
-			}
-			if len(matches) == 0 {
-				return nil, fmt.Errorf("wasi-libc: did not find any files for pattern %#v", pattern)
-			}
-			excludeSet := map[string]struct{}{}
-			for _, exclude := range pattern.exclude {
-				excludeSet[exclude] = struct{}{}
-			}
-			for _, match := range matches {
-				if _, ok := excludeSet[filepath.Base(match)]; ok {
-					continue
-				}
-				relpath, err := filepath.Rel(basepath, match)
-				if err != nil {
-					// Not sure if this is even possible.
-					return nil, err
-				}
-				sources = append(sources, relpath)
-			}
-		}
-		return sources, nil
-	},
-}
@@ -1,81 +0,0 @@
-package builder
-
-import (
-	"os"
-	"path/filepath"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var libWasmBuiltins = Library{
-	name: "wasmbuiltins",
-	makeHeaders: func(target, includeDir string) error {
-		if err := os.Mkdir(includeDir+"/bits", 0o777); err != nil {
-			return err
-		}
-		f, err := os.Create(includeDir + "/bits/alltypes.h")
-		if err != nil {
-			return err
-		}
-		if _, err := f.Write([]byte(wasmAllTypes)); err != nil {
-			return err
-		}
-		return f.Close()
-	},
-	cflags: func(target, headerPath string) []string {
-		libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-		return []string{
-			"-Werror",
-			"-Wall",
-			"-std=gnu11",
-			"-nostdlibinc",
-			"-isystem", libcDir + "/libc-top-half/musl/arch/wasm32",
-			"-isystem", libcDir + "/libc-top-half/musl/arch/generic",
-			"-isystem", libcDir + "/libc-top-half/musl/src/internal",
-			"-isystem", libcDir + "/libc-top-half/musl/src/include",
-			"-isystem", libcDir + "/libc-top-half/musl/include",
-			"-isystem", libcDir + "/libc-bottom-half/headers/public",
-			"-I" + headerPath,
-		}
-	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
-	librarySources: func(target string) ([]string, error) {
-		return []string{
-			// memory builtins needed for llvm.memcpy.*, llvm.memmove.*, and
-			// llvm.memset.* LLVM intrinsics.
-			"libc-top-half/musl/src/string/memcpy.c",
-			"libc-top-half/musl/src/string/memmove.c",
-			"libc-top-half/musl/src/string/memset.c",
-
-			// exp, exp2, and log are needed for LLVM math builtin functions
-			// like llvm.exp.*.
-			"libc-top-half/musl/src/math/__math_divzero.c",
-			"libc-top-half/musl/src/math/__math_invalid.c",
-			"libc-top-half/musl/src/math/__math_oflow.c",
-			"libc-top-half/musl/src/math/__math_uflow.c",
-			"libc-top-half/musl/src/math/__math_xflow.c",
-			"libc-top-half/musl/src/math/exp.c",
-			"libc-top-half/musl/src/math/exp_data.c",
-			"libc-top-half/musl/src/math/exp2.c",
-			"libc-top-half/musl/src/math/log.c",
-			"libc-top-half/musl/src/math/log_data.c",
-		}, nil
-	},
-}
-
-// alltypes.h for wasm-libc, using the types as defined inside Clang.
-const wasmAllTypes = `
-typedef __SIZE_TYPE__    size_t;
-typedef __INT8_TYPE__    int8_t;
-typedef __INT16_TYPE__   int16_t;
-typedef __INT32_TYPE__   int32_t;
-typedef __INT64_TYPE__   int64_t;
-typedef __UINT8_TYPE__   uint8_t;
-typedef __UINT16_TYPE__  uint16_t;
-typedef __UINT32_TYPE__  uint32_t;
-typedef __UINT64_TYPE__  uint64_t;
-typedef __UINTPTR_TYPE__ uintptr_t;
-
-// This type is used internally in wasi-libc.
-typedef double double_t;
-`
@@ -18,7 +18,6 @@ import (
 	"go/scanner"
 	"go/token"
 	"path/filepath"
-	"sort"
 	"strconv"
 	"strings"

@@ -26,15 +25,9 @@ import (
 	"golang.org/x/tools/go/ast/astutil"
 )

-// Function that's only defined in Go 1.22.
-var setASTFileFields = func(f *ast.File, start, end token.Pos) {
-}
-
 // cgoPackage holds all CGo-related information of a package.
 type cgoPackage struct {
 	generated       *ast.File
-	packageName     string
-	cgoFiles        []*ast.File
 	generatedPos    token.Pos
 	errors          []error
 	currentDir      string // current working directory
@@ -43,7 +36,6 @@ type cgoPackage struct {
 	fset            *token.FileSet
 	tokenFiles      map[string]*token.File
 	definedGlobally map[string]ast.Node
-	noescapingFuncs map[string]*noescapingFunc // #cgo noescape lines
 	anonDecls       map[interface{}]string
 	cflags          []string // CFlags from #cgo lines
 	ldflags         []string // LDFlags from #cgo lines
@@ -82,28 +74,18 @@ type bitfieldInfo struct {
 	endBit   int64 // may be 0 meaning "until the end of the field"
 }

-// Information about a #cgo noescape line in the source code.
-type noescapingFunc struct {
-	name string
-	pos  token.Pos
-	used bool // true if used somewhere in the source (for proper error reporting)
-}
-
 // cgoAliases list type aliases between Go and C, for types that are equivalent
 // in both languages. See addTypeAliases.
 var cgoAliases = map[string]string{
-	"_Cgo_int8_t":    "int8",
-	"_Cgo_int16_t":   "int16",
-	"_Cgo_int32_t":   "int32",
-	"_Cgo_int64_t":   "int64",
-	"_Cgo_uint8_t":   "uint8",
-	"_Cgo_uint16_t":  "uint16",
-	"_Cgo_uint32_t":  "uint32",
-	"_Cgo_uint64_t":  "uint64",
-	"_Cgo_uintptr_t": "uintptr",
-	"_Cgo_float":     "float32",
-	"_Cgo_double":    "float64",
-	"_Cgo__Bool":     "bool",
+	"C.int8_t":    "int8",
+	"C.int16_t":   "int16",
+	"C.int32_t":   "int32",
+	"C.int64_t":   "int64",
+	"C.uint8_t":   "uint8",
+	"C.uint16_t":  "uint16",
+	"C.uint32_t":  "uint32",
+	"C.uint64_t":  "uint64",
+	"C.uintptr_t": "uintptr",
 }

 // builtinAliases are handled specially because they only exist on the Go side
@@ -145,105 +127,31 @@ typedef unsigned long long  _Cgo_ulonglong;
 // The string/bytes functions below implement C.CString etc. To make sure the
 // runtime doesn't need to know the C int type, lengths are converted to uintptr
 // first.
-const generatedGoFilePrefixBase = `
-import "syscall"
+// These functions will be modified to get a "C." prefix, so the source below
+// doesn't reflect the final AST.
+const generatedGoFilePrefix = `
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func __GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func __GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-`
-
-const generatedGoFilePrefixOther = generatedGoFilePrefixBase + `
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
-}
-`
-
-// Windows uses fake errno values in the syscall package.
-// See for example: https://github.com/golang/go/issues/23468
-// TinyGo uses mingw-w64 though, which does have defined errno values. Since the
-// syscall package is the standard library one we can't change it, but we can
-// map the errno values to match the values in the syscall package.
-// Source of the errno values: lib/mingw-w64/mingw-w64-headers/crt/errno.h
-const generatedGoFilePrefixWindows = generatedGoFilePrefixBase + `
-var _Cgo___errno_mapping = [...]syscall.Errno{
-	1:  syscall.EPERM,
-	2:  syscall.ENOENT,
-	3:  syscall.ESRCH,
-	4:  syscall.EINTR,
-	5:  syscall.EIO,
-	6:  syscall.ENXIO,
-	7:  syscall.E2BIG,
-	8:  syscall.ENOEXEC,
-	9:  syscall.EBADF,
-	10: syscall.ECHILD,
-	11: syscall.EAGAIN,
-	12: syscall.ENOMEM,
-	13: syscall.EACCES,
-	14: syscall.EFAULT,
-	16: syscall.EBUSY,
-	17: syscall.EEXIST,
-	18: syscall.EXDEV,
-	19: syscall.ENODEV,
-	20: syscall.ENOTDIR,
-	21: syscall.EISDIR,
-	22: syscall.EINVAL,
-	23: syscall.ENFILE,
-	24: syscall.EMFILE,
-	25: syscall.ENOTTY,
-	27: syscall.EFBIG,
-	28: syscall.ENOSPC,
-	29: syscall.ESPIPE,
-	30: syscall.EROFS,
-	31: syscall.EMLINK,
-	32: syscall.EPIPE,
-	33: syscall.EDOM,
-	34: syscall.ERANGE,
-	36: syscall.EDEADLK,
-	38: syscall.ENAMETOOLONG,
-	39: syscall.ENOLCK,
-	40: syscall.ENOSYS,
-	41: syscall.ENOTEMPTY,
-	42: syscall.EILSEQ,
-}
-
-func _Cgo___get_errno() error {
-	num := _Cgo___get_errno_num()
-	if num < uintptr(len(_Cgo___errno_mapping)) {
-		if mapped := _Cgo___errno_mapping[num]; mapped != 0 {
-			return mapped
-		}
-	}
-	return syscall.Errno(num)
+func GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 `

@@ -254,15 +162,13 @@ func _Cgo___get_errno() error {
 // functions), the CFLAGS and LDFLAGS found in #cgo lines, and a map of file
 // hashes of the accessed C header files. If there is one or more error, it
 // returns these in the []error slice but still modifies the AST.
-func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cflags []string, goos string) ([]*ast.File, []string, []string, []string, map[string][]byte, []error) {
+func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cflags []string, clangHeaders string) (*ast.File, []string, []string, []string, map[string][]byte, []error) {
 	p := &cgoPackage{
-		packageName:     files[0].Name.Name,
 		currentDir:      dir,
 		importPath:      importPath,
 		fset:            fset,
 		tokenFiles:      map[string]*token.File{},
 		definedGlobally: map[string]ast.Node{},
-		noescapingFuncs: map[string]*noescapingFunc{},
 		anonDecls:       map[interface{}]string{},
 		visitedFiles:    map[string][]byte{},
 	}
@@ -287,21 +193,32 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// Construct a new in-memory AST for CGo declarations of this package.
 	// The first part is written as Go code that is then parsed, but more code
 	// is added later to the AST to declare functions, globals, etc.
-	goCode := "package " + files[0].Name.Name + "\n\n"
-	if goos == "windows" {
-		goCode += generatedGoFilePrefixWindows
-	} else {
-		goCode += generatedGoFilePrefixOther
-	}
+	goCode := "package " + files[0].Name.Name + "\n\n" + generatedGoFilePrefix
 	p.generated, err = parser.ParseFile(fset, dir+"/!cgo.go", goCode, parser.ParseComments)
 	if err != nil {
 		// This is always a bug in the cgo package.
 		panic("unexpected error: " + err.Error())
 	}
-	p.cgoFiles = append(p.cgoFiles, p.generated)
 	// If the Comments field is not set to nil, the go/format package will get
 	// confused about where comments should go.
 	p.generated.Comments = nil
+	// Adjust some of the functions in there.
+	for _, decl := range p.generated.Decls {
+		switch decl := decl.(type) {
+		case *ast.FuncDecl:
+			switch decl.Name.Name {
+			case "CString", "GoString", "GoStringN", "__GoStringN", "GoBytes", "__GoBytes":
+				// Adjust the name to have a "C." prefix so it is correctly
+				// resolved.
+				decl.Name.Name = "C." + decl.Name.Name
+			}
+		}
+	}
+	// Patch some types, for example *C.char in C.CString.
+	cf := p.newCGoFile(nil, -1) // dummy *cgoFile for the walker
+	astutil.Apply(p.generated, func(cursor *astutil.Cursor) bool {
+		return cf.walker(cursor, nil)
+	}, nil)

 	// Find `import "C"` C fragments in the file.
 	p.cgoHeaders = make([]string, len(files)) // combined CGo header fragment for each file
@@ -372,6 +289,9 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// have better alternatives anyway.
 	cflagsForCGo := append([]string{"-D_FORTIFY_SOURCE=0"}, cflags...)
 	cflagsForCGo = append(cflagsForCGo, p.cflags...)
+	if clangHeaders != "" {
+		cflagsForCGo = append(cflagsForCGo, "-isystem", clangHeaders)
+	}

 	// Retrieve types such as C.int, C.longlong, etc from C.
 	p.newCGoFile(nil, -1).readNames(builtinAliasTypedefs, cflagsForCGo, "", func(names map[string]clangCursor) {
@@ -380,7 +300,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 			Tok:    token.TYPE,
 		}
 		for _, name := range builtinAliases {
-			typeSpec := p.getIntegerType("_Cgo_"+name, names["_Cgo_"+name])
+			typeSpec := p.getIntegerType("C."+name, names["_Cgo_"+name])
 			gen.Specs = append(gen.Specs, typeSpec)
 		}
 		p.generated.Decls = append(p.generated.Decls, gen)
@@ -389,13 +309,6 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// Process CGo imports for each file.
 	for i, f := range files {
 		cf := p.newCGoFile(f, i)
-		// These types are aliased with the corresponding types in C. For
-		// example, float in C is always float32 in Go.
-		cf.names["float"] = clangCursor{}
-		cf.names["double"] = clangCursor{}
-		cf.names["_Bool"] = clangCursor{}
-		// Now read all the names (identifies) that C defines in the header
-		// snippet.
 		cf.readNames(p.cgoHeaders[i], cflagsForCGo, filepath.Base(fset.File(f.Pos()).Name()), func(names map[string]clangCursor) {
 			for _, name := range builtinAliases {
 				// Names such as C.int should not be obtained from C.
@@ -409,26 +322,10 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 		})
 	}

-	// Show an error when a #cgo noescape line isn't used in practice.
-	// This matches upstream Go. I think the goal is to avoid issues with
-	// misspelled function names, which seems very useful.
-	var unusedNoescapeLines []*noescapingFunc
-	for _, value := range p.noescapingFuncs {
-		if !value.used {
-			unusedNoescapeLines = append(unusedNoescapeLines, value)
-		}
-	}
-	sort.SliceStable(unusedNoescapeLines, func(i, j int) bool {
-		return unusedNoescapeLines[i].pos < unusedNoescapeLines[j].pos
-	})
-	for _, value := range unusedNoescapeLines {
-		p.addError(value.pos, fmt.Sprintf("function %#v in #cgo noescape line is not used", value.name))
-	}
-
 	// Print the newly generated in-memory AST, for debugging.
 	//ast.Print(fset, p.generated)

-	return p.cgoFiles, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
+	return p.generated, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
 }

 func (p *cgoPackage) newCGoFile(file *ast.File, index int) *cgoFile {
@@ -490,33 +387,6 @@ func (p *cgoPackage) parseCGoPreprocessorLines(text string, pos token.Pos) strin
 		}
 		text = text[:lineStart] + string(spaces) + text[lineEnd:]

-		allFields := strings.Fields(line[4:])
-		switch allFields[0] {
-		case "noescape":
-			// The code indicates that pointer parameters will not be captured
-			// by the called C function.
-			if len(allFields) < 2 {
-				p.addErrorAfter(pos, text[:lineStart], "missing function name in #cgo noescape line")
-				continue
-			}
-			if len(allFields) > 2 {
-				p.addErrorAfter(pos, text[:lineStart], "multiple function names in #cgo noescape line")
-				continue
-			}
-			name := allFields[1]
-			p.noescapingFuncs[name] = &noescapingFunc{
-				name: name,
-				pos:  pos,
-				used: false,
-			}
-			continue
-		case "nocallback":
-			// We don't do anything special when calling a C function, so there
-			// appears to be no optimization that we can do here.
-			// Accept, but ignore the parameter for compatibility.
-			continue
-		}
-
 		// Get the text before the colon in the #cgo directive.
 		colon := strings.IndexByte(line, ':')
 		if colon < 0 {
@@ -1078,9 +948,6 @@ func (p *cgoPackage) isEquivalentAST(a, b ast.Node) bool {
 		if !ok {
 			return false
 		}
-		if node == nil || b == nil {
-			return node == b
-		}
 		if len(node.List) != len(b.List) {
 			return false
 		}
@@ -1253,22 +1120,22 @@ func (p *cgoPackage) getUnnamedDeclName(prefix string, itf interface{}) string {
 func (f *cgoFile) getASTDeclName(name string, found clangCursor, iscall bool) string {
 	// Some types are defined in stdint.h and map directly to a particular Go
 	// type.
-	if alias := cgoAliases["_Cgo_"+name]; alias != "" {
+	if alias := cgoAliases["C."+name]; alias != "" {
 		return alias
 	}
-	node := f.getASTDeclNode(name, found)
+	node := f.getASTDeclNode(name, found, iscall)
 	if node, ok := node.(*ast.FuncDecl); ok {
 		if !iscall {
 			return node.Name.Name + "$funcaddr"
 		}
 		return node.Name.Name
 	}
-	return "_Cgo_" + name
+	return "C." + name
 }

 // getASTDeclNode will declare the given C AST node (if not already defined) and
 // returns it.
-func (f *cgoFile) getASTDeclNode(name string, found clangCursor) ast.Node {
+func (f *cgoFile) getASTDeclNode(name string, found clangCursor, iscall bool) ast.Node {
 	if node, ok := f.defined[name]; ok {
 		// Declaration was found in the current file, so return it immediately.
 		return node
@@ -1363,8 +1230,8 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 	case *elaboratedTypeInfo:
 		// Add struct bitfields.
 		for _, bitfield := range elaboratedType.bitfields {
-			f.createBitfieldGetter(bitfield, "_Cgo_"+name)
-			f.createBitfieldSetter(bitfield, "_Cgo_"+name)
+			f.createBitfieldGetter(bitfield, "C."+name)
+			f.createBitfieldSetter(bitfield, "C."+name)
 		}
 		if elaboratedType.unionSize != 0 {
 			// Create union getters/setters.
@@ -1373,7 +1240,7 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 					f.addError(elaboratedType.pos, fmt.Sprintf("union must have field with a single name, it has %d names", len(field.Names)))
 					continue
 				}
-				f.createUnionAccessor(field, "_Cgo_"+name)
+				f.createUnionAccessor(field, "C."+name)
 			}
 		}
 	}
@@ -1387,45 +1254,6 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 // separate namespace (no _Cgo_ hacks like in gc).
 func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) bool {
 	switch node := cursor.Node().(type) {
-	case *ast.AssignStmt:
-		// An assign statement could be something like this:
-		//
-		//   val, errno := C.some_func()
-		//
-		// Check whether it looks like that, and if so, read the errno value and
-		// return it as the second return value. The call will be transformed
-		// into something like this:
-		//
-		//   val, errno := C.some_func(), C.__get_errno()
-		if len(node.Lhs) != 2 || len(node.Rhs) != 1 {
-			return true
-		}
-		rhs, ok := node.Rhs[0].(*ast.CallExpr)
-		if !ok {
-			return true
-		}
-		fun, ok := rhs.Fun.(*ast.SelectorExpr)
-		if !ok {
-			return true
-		}
-		x, ok := fun.X.(*ast.Ident)
-		if !ok {
-			return true
-		}
-		if found, ok := names[fun.Sel.Name]; ok && x.Name == "C" {
-			// Replace "C"."some_func" into "C.somefunc".
-			rhs.Fun = &ast.Ident{
-				NamePos: x.NamePos,
-				Name:    f.getASTDeclName(fun.Sel.Name, found, true),
-			}
-			// Add the errno value as the second value in the statement.
-			node.Rhs = append(node.Rhs, &ast.CallExpr{
-				Fun: &ast.Ident{
-					NamePos: node.Lhs[1].End(),
-					Name:    "_Cgo___get_errno",
-				},
-			})
-		}
 	case *ast.CallExpr:
 		fun, ok := node.Fun.(*ast.SelectorExpr)
 		if !ok {
@@ -1447,7 +1275,7 @@ func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) b
 			return true
 		}
 		if x.Name == "C" {
-			name := "_Cgo_" + node.Sel.Name
+			name := "C." + node.Sel.Name
 			if found, ok := names[node.Sel.Name]; ok {
 				name = f.getASTDeclName(node.Sel.Name, found, false)
 			}
@@ -1,17 +0,0 @@
-//go:build go1.22
-
-package cgo
-
-// Code specifically for Go 1.22.
-
-import (
-	"go/ast"
-	"go/token"
-)
-
-func init() {
-	setASTFileFields = func(f *ast.File, start, end token.Pos) {
-		f.FileStart = start
-		f.FileEnd = end
-	}
-}
@@ -7,12 +7,10 @@ import (
 	"go/ast"
 	"go/format"
 	"go/parser"
-	"go/scanner"
 	"go/token"
 	"go/types"
 	"os"
 	"path/filepath"
-	"regexp"
 	"runtime"
 	"strings"
 	"testing"
@@ -23,15 +21,9 @@ var flagUpdate = flag.Bool("update", false, "Update images based on test output.

 // normalizeResult normalizes Go source code that comes out of tests across
 // platforms and Go versions.
-func normalizeResult(t *testing.T, result string) string {
-	result = strings.ReplaceAll(result, "\r\n", "\n")
-
-	// This changed to 'undefined:', in Go 1.20.
-	result = strings.ReplaceAll(result, ": undeclared name:", ": undefined:")
-	// Go 1.20 added a bit more detail
-	result = regexp.MustCompile(`(unknown field z in struct literal).*`).ReplaceAllString(result, "$1")
-
-	return result
+func normalizeResult(result string) string {
+	actual := strings.ReplaceAll(result, "\r\n", "\n")
+	return actual
 }

 func TestCGo(t *testing.T) {
@@ -56,7 +48,7 @@ func TestCGo(t *testing.T) {
 			}

 			// Process the AST with CGo.
-			cgoFiles, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags, "linux")
+			cgoAST, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags, "")

 			// Check the AST for type errors.
 			var typecheckErrors []error
@@ -64,10 +56,10 @@ func TestCGo(t *testing.T) {
 				Error: func(err error) {
 					typecheckErrors = append(typecheckErrors, err)
 				},
-				Importer: newSimpleImporter(),
+				Importer: simpleImporter{},
 				Sizes:    types.SizesFor("gccgo", "arm"),
 			}
-			_, err = config.Check("", fset, append([]*ast.File{f}, cgoFiles...), nil)
+			_, err = config.Check("", fset, []*ast.File{f, cgoAST}, nil)
 			if err != nil && len(typecheckErrors) == 0 {
 				// Only report errors when no type errors are found (an
 				// unexpected condition).
@@ -92,11 +84,11 @@ func TestCGo(t *testing.T) {
 				}
 				buf.WriteString("\n")
 			}
-			err = format.Node(buf, fset, cgoFiles[0])
+			err = format.Node(buf, fset, cgoAST)
 			if err != nil {
 				t.Errorf("could not write out CGo AST: %v", err)
 			}
-			actual := normalizeResult(t, buf.String())
+			actual := normalizeResult(buf.String())

 			// Read the file with the expected output, to compare against.
 			outfile := filepath.Join("testdata", name+".out.go")
@@ -123,112 +115,15 @@ func TestCGo(t *testing.T) {
 	}
 }

-func Test_cgoPackage_isEquivalentAST(t *testing.T) {
-	fieldA := &ast.Field{Type: &ast.BasicLit{Kind: token.STRING, Value: "a"}}
-	fieldB := &ast.Field{Type: &ast.BasicLit{Kind: token.STRING, Value: "b"}}
-	listOfFieldA := &ast.FieldList{List: []*ast.Field{fieldA}}
-	listOfFieldB := &ast.FieldList{List: []*ast.Field{fieldB}}
-	funcDeclA := &ast.FuncDecl{Name: &ast.Ident{Name: "a"}, Type: &ast.FuncType{Params: &ast.FieldList{}, Results: listOfFieldA}}
-	funcDeclB := &ast.FuncDecl{Name: &ast.Ident{Name: "b"}, Type: &ast.FuncType{Params: &ast.FieldList{}, Results: listOfFieldB}}
-	funcDeclNoResults := &ast.FuncDecl{Name: &ast.Ident{Name: "C"}, Type: &ast.FuncType{Params: &ast.FieldList{}}}
-
-	testCases := []struct {
-		name     string
-		a, b     ast.Node
-		expected bool
-	}{
-		{
-			name:     "both nil",
-			expected: true,
-		},
-		{
-			name:     "not same type",
-			a:        fieldA,
-			b:        &ast.FuncDecl{},
-			expected: false,
-		},
-		{
-			name:     "Field same",
-			a:        fieldA,
-			b:        fieldA,
-			expected: true,
-		},
-		{
-			name:     "Field different",
-			a:        fieldA,
-			b:        fieldB,
-			expected: false,
-		},
-		{
-			name:     "FuncDecl Type Results nil",
-			a:        funcDeclNoResults,
-			b:        funcDeclNoResults,
-			expected: true,
-		},
-		{
-			name:     "FuncDecl Type Results same",
-			a:        funcDeclA,
-			b:        funcDeclA,
-			expected: true,
-		},
-		{
-			name:     "FuncDecl Type Results different",
-			a:        funcDeclA,
-			b:        funcDeclB,
-			expected: false,
-		},
-		{
-			name:     "FuncDecl Type Results a nil",
-			a:        funcDeclNoResults,
-			b:        funcDeclB,
-			expected: false,
-		},
-		{
-			name:     "FuncDecl Type Results b nil",
-			a:        funcDeclA,
-			b:        funcDeclNoResults,
-			expected: false,
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			p := &cgoPackage{}
-			if got := p.isEquivalentAST(tc.a, tc.b); tc.expected != got {
-				t.Errorf("expected %v, got %v", tc.expected, got)
-			}
-		})
-	}
-}
-
 // simpleImporter implements the types.Importer interface, but only allows
-// importing the syscall and unsafe packages.
+// importing the unsafe package.
 type simpleImporter struct {
-	syscallPkg *types.Package
-}
-
-func newSimpleImporter() *simpleImporter {
-	i := &simpleImporter{}
-
-	// Implement a dummy syscall package with the Errno type.
-	i.syscallPkg = types.NewPackage("syscall", "syscall")
-	obj := types.NewTypeName(token.NoPos, i.syscallPkg, "Errno", nil)
-	named := types.NewNamed(obj, nil, nil)
-	i.syscallPkg.Scope().Insert(obj)
-	named.SetUnderlying(types.Typ[types.Uintptr])
-	sig := types.NewSignatureType(nil, nil, nil, types.NewTuple(), types.NewTuple(types.NewParam(token.NoPos, i.syscallPkg, "", types.Typ[types.String])), false)
-	named.AddMethod(types.NewFunc(token.NoPos, i.syscallPkg, "Error", sig))
-	i.syscallPkg.MarkComplete()
-
-	return i
 }

 // Import implements the Importer interface. For testing usage only: it only
 // supports importing the unsafe package.
-func (i *simpleImporter) Import(path string) (*types.Package, error) {
+func (i simpleImporter) Import(path string) (*types.Package, error) {
 	switch path {
-	case "syscall":
-		return i.syscallPkg, nil
 	case "unsafe":
 		return types.Unsafe, nil
 	default:
@@ -236,16 +131,10 @@ func (i *simpleImporter) Import(path string) (*types.Package, error) {
 	}
 }

-// formatDiagnostic formats the error message to be an indented comment. It
+// formatDiagnostics formats the error message to be an indented comment. It
 // also fixes Windows path name issues (backward slashes).
 func formatDiagnostic(err error) string {
-	var msg string
-	switch err := err.(type) {
-	case scanner.Error:
-		msg = err.Pos.String() + ": " + err.Msg
-	default:
-		msg = err.Error()
-	}
+	msg := err.Error()
 	if runtime.GOOS == "windows" {
 		// Fix Windows path slashes.
 		msg = strings.ReplaceAll(msg, "testdata\\", "testdata/")
@@ -14,11 +14,6 @@ import (
 var (
 	prefixParseFns map[token.Token]func(*tokenizer) (ast.Expr, *scanner.Error)
 	precedences    = map[token.Token]int{
-		token.OR:  precedenceOr,
-		token.XOR: precedenceXor,
-		token.AND: precedenceAnd,
-		token.SHL: precedenceShift,
-		token.SHR: precedenceShift,
 		token.ADD: precedenceAdd,
 		token.SUB: precedenceAdd,
 		token.MUL: precedenceMul,
@@ -27,13 +22,8 @@ var (
 	}
 )

-// See: https://en.cppreference.com/w/c/language/operator_precedence
 const (
 	precedenceLowest = iota + 1
-	precedenceOr
-	precedenceXor
-	precedenceAnd
-	precedenceShift
 	precedenceAdd
 	precedenceMul
 	precedencePrefix
@@ -54,72 +44,8 @@ func init() {
 }

 // parseConst parses the given string as a C constant.
-func parseConst(pos token.Pos, fset *token.FileSet, value string, params []ast.Expr, callerPos token.Pos, f *cgoFile) (ast.Expr, *scanner.Error) {
-	t := newTokenizer(pos, fset, value, f)
-
-	// If params is non-nil (could be a zero length slice), this const is
-	// actually a function-call like expression from another macro.
-	// This means we have to parse a string like "(a, b) (a+b)".
-	// We do this by parsing the parameters at the start and then treating the
-	// following like a normal constant expression.
-	if params != nil {
-		// Parse opening paren.
-		if t.curToken != token.LPAREN {
-			return nil, unexpectedToken(t, token.LPAREN)
-		}
-		t.Next()
-
-		// Parse parameters (identifiers) and closing paren.
-		var paramIdents []string
-		for i := 0; ; i++ {
-			if i == 0 && t.curToken == token.RPAREN {
-				// No parameters, break early.
-				t.Next()
-				break
-			}
-
-			// Read the parameter name.
-			if t.curToken != token.IDENT {
-				return nil, unexpectedToken(t, token.IDENT)
-			}
-			paramIdents = append(paramIdents, t.curValue)
-			t.Next()
-
-			// Read the next token: either a continuation (comma) or end of list
-			// (rparen).
-			if t.curToken == token.RPAREN {
-				// End of parameter list.
-				t.Next()
-				break
-			} else if t.curToken == token.COMMA {
-				// Comma, so there will be another parameter name.
-				t.Next()
-			} else {
-				return nil, &scanner.Error{
-					Pos: t.fset.Position(t.curPos),
-					Msg: "unexpected token " + t.curToken.String() + " inside macro parameters, expected ',' or ')'",
-				}
-			}
-		}
-
-		// Report an error if there is a mismatch in parameter length.
-		// The error is reported at the location of the closing paren from the
-		// caller location.
-		if len(params) != len(paramIdents) {
-			return nil, &scanner.Error{
-				Pos: t.fset.Position(callerPos),
-				Msg: fmt.Sprintf("unexpected number of parameters: expected %d, got %d", len(paramIdents), len(params)),
-			}
-		}
-
-		// Assign values to the parameters.
-		// These parameter names are closer in 'scope' than other identifiers so
-		// will be used first when parsing an identifier.
-		for i, name := range paramIdents {
-			t.params[name] = params[i]
-		}
-	}
-
+func parseConst(pos token.Pos, fset *token.FileSet, value string) (ast.Expr, *scanner.Error) {
+	t := newTokenizer(pos, fset, value)
 	expr, err := parseConstExpr(t, precedenceLowest)
 	t.Next()
 	if t.curToken != token.EOF {
@@ -150,7 +76,7 @@ func parseConstExpr(t *tokenizer, precedence int) (ast.Expr, *scanner.Error) {

 	for t.peekToken != token.EOF && precedence < precedences[t.peekToken] {
 		switch t.peekToken {
-		case token.OR, token.XOR, token.AND, token.SHL, token.SHR, token.ADD, token.SUB, token.MUL, token.QUO, token.REM:
+		case token.ADD, token.SUB, token.MUL, token.QUO, token.REM:
 			t.Next()
 			leftExpr, err = parseBinaryExpr(t, leftExpr)
 		}
@@ -160,68 +86,6 @@ func parseConstExpr(t *tokenizer, precedence int) (ast.Expr, *scanner.Error) {
 }

 func parseIdent(t *tokenizer) (ast.Expr, *scanner.Error) {
-	// If the identifier is one of the parameters of this function-like macro,
-	// use the parameter value.
-	if val, ok := t.params[t.curValue]; ok {
-		return val, nil
-	}
-
-	if t.f != nil {
-		// Check whether this identifier is actually a macro "call" with
-		// parameters. In that case, we should parse the parameters and pass it
-		// on to a new invocation of parseConst.
-		if t.peekToken == token.LPAREN {
-			if cursor, ok := t.f.names[t.curValue]; ok && t.f.isFunctionLikeMacro(cursor) {
-				// We know the current and peek tokens (the peek one is the '('
-				// token). So skip ahead until the current token is the first
-				// unknown token.
-				t.Next()
-				t.Next()
-
-				// Parse the list of parameters until ')' (rparen) is found.
-				params := []ast.Expr{}
-				for i := 0; ; i++ {
-					if i == 0 && t.curToken == token.RPAREN {
-						break
-					}
-					x, err := parseConstExpr(t, precedenceLowest)
-					if err != nil {
-						return nil, err
-					}
-					params = append(params, x)
-					t.Next()
-					if t.curToken == token.COMMA {
-						t.Next()
-					} else if t.curToken == token.RPAREN {
-						break
-					} else {
-						return nil, &scanner.Error{
-							Pos: t.fset.Position(t.curPos),
-							Msg: "unexpected token " + t.curToken.String() + ", ',' or ')'",
-						}
-					}
-				}
-
-				// Evaluate the macro value and use it as the identifier value.
-				rparen := t.curPos
-				pos, text := t.f.getMacro(cursor)
-				return parseConst(pos, t.fset, text, params, rparen, t.f)
-			}
-		}
-
-		// Normally the name is something defined in the file (like another
-		// macro) which we get the declaration from using getASTDeclName.
-		// This ensures that names that are only referenced inside a macro are
-		// still getting defined.
-		if cursor, ok := t.f.names[t.curValue]; ok {
-			return &ast.Ident{
-				NamePos: t.curPos,
-				Name:    t.f.getASTDeclName(t.curValue, cursor, false),
-			}, nil
-		}
-	}
-
-	// t.f is nil during testing. This is a fallback.
 	return &ast.Ident{
 		NamePos: t.curPos,
 		Name:    "C." + t.curValue,
@@ -290,25 +154,21 @@ func unexpectedToken(t *tokenizer, expected token.Token) *scanner.Error {

 // tokenizer reads C source code and converts it to Go tokens.
 type tokenizer struct {
-	f                   *cgoFile
 	curPos, peekPos     token.Pos
 	fset                *token.FileSet
 	curToken, peekToken token.Token
 	curValue, peekValue string
 	buf                 string
-	params              map[string]ast.Expr
 }

 // newTokenizer initializes a new tokenizer, positioned at the first token in
 // the string.
-func newTokenizer(start token.Pos, fset *token.FileSet, buf string, f *cgoFile) *tokenizer {
+func newTokenizer(start token.Pos, fset *token.FileSet, buf string) *tokenizer {
 	t := &tokenizer{
-		f:         f,
 		peekPos:   start,
 		fset:      fset,
 		buf:       buf,
 		peekToken: token.ILLEGAL,
-		params:    make(map[string]ast.Expr),
 	}
 	// Parse the first two tokens (cur and peek).
 	t.Next()
@@ -325,9 +185,7 @@ func (t *tokenizer) Next() {
 	t.curValue = t.peekValue

 	// Parse the next peek token.
-	if t.peekPos != token.NoPos {
-		t.peekPos += token.Pos(len(t.curValue))
-	}
+	t.peekPos += token.Pos(len(t.curValue))
 	for {
 		if len(t.buf) == 0 {
 			t.peekToken = token.EOF
@@ -339,28 +197,9 @@ func (t *tokenizer) Next() {
 			// Skip whitespace.
 			// Based on this source, not sure whether it represents C whitespace:
 			// https://en.cppreference.com/w/cpp/string/byte/isspace
-			if t.peekPos != token.NoPos {
-				t.peekPos++
-			}
+			t.peekPos++
 			t.buf = t.buf[1:]
-		case len(t.buf) >= 2 && (string(t.buf[:2]) == "||" || string(t.buf[:2]) == "&&" || string(t.buf[:2]) == "<<" || string(t.buf[:2]) == ">>"):
-			// Two-character tokens.
-			switch c {
-			case '&':
-				t.peekToken = token.LAND
-			case '|':
-				t.peekToken = token.LOR
-			case '<':
-				t.peekToken = token.SHL
-			case '>':
-				t.peekToken = token.SHR
-			default:
-				panic("unreachable")
-			}
-			t.peekValue = t.buf[:2]
-			t.buf = t.buf[2:]
-			return
-		case c == '(' || c == ')' || c == ',' || c == '+' || c == '-' || c == '*' || c == '/' || c == '%' || c == '&' || c == '|' || c == '^':
+		case c == '(' || c == ')' || c == '+' || c == '-' || c == '*' || c == '/' || c == '%':
 			// Single-character tokens.
 			// TODO: ++ (increment) and -- (decrement) operators.
 			switch c {
@@ -368,8 +207,6 @@ func (t *tokenizer) Next() {
 				t.peekToken = token.LPAREN
 			case ')':
 				t.peekToken = token.RPAREN
-			case ',':
-				t.peekToken = token.COMMA
 			case '+':
 				t.peekToken = token.ADD
 			case '-':
@@ -380,12 +217,6 @@ func (t *tokenizer) Next() {
 				t.peekToken = token.QUO
 			case '%':
 				t.peekToken = token.REM
-			case '&':
-				t.peekToken = token.AND
-			case '|':
-				t.peekToken = token.OR
-			case '^':
-				t.peekToken = token.XOR
 			}
 			t.peekValue = t.buf[:1]
 			t.buf = t.buf[1:]
@@ -37,14 +37,6 @@ func TestParseConst(t *testing.T) {
 		{`5*5`, `5 * 5`},
 		{`5/5`, `5 / 5`},
 		{`5%5`, `5 % 5`},
-		{`5&5`, `5 & 5`},
-		{`5|5`, `5 | 5`},
-		{`5^5`, `5 ^ 5`},
-		{`5<<5`, `5 << 5`},
-		{`5>>5`, `5 >> 5`},
-		{`5>>5 + 3`, `5 >> (5 + 3)`},
-		{`5>>5 ^ 3`, `5>>5 ^ 3`},
-		{`5||5`, `error: 1:2: unexpected token ||, expected end of expression`}, // logical binops aren't supported yet
 		{`(5/5)`, `(5 / 5)`},
 		{`1 - 2`, `1 - 2`},
 		{`1 - 2 + 3`, `1 - 2 + 3`},
@@ -59,7 +51,7 @@ func TestParseConst(t *testing.T) {
 	} {
 		fset := token.NewFileSet()
 		startPos := fset.AddFile("", -1, 1000).Pos(0)
-		expr, err := parseConst(startPos, fset, tc.C, nil, token.NoPos, nil)
+		expr, err := parseConst(startPos, fset, tc.C)
 		s := "<invalid>"
 		if err != nil {
 			if !strings.HasPrefix(tc.Go, "error: ") {
@@ -4,7 +4,6 @@ package cgo
 // modification. It does not touch the AST itself.

 import (
-	"bytes"
 	"crypto/sha256"
 	"crypto/sha512"
 	"encoding/hex"
@@ -61,26 +60,11 @@ CXSourceRange tinygo_clang_getCursorExtent(GoCXCursor c);
 CXTranslationUnit tinygo_clang_Cursor_getTranslationUnit(GoCXCursor c);
 long long tinygo_clang_getEnumConstantDeclValue(GoCXCursor c);
 CXType tinygo_clang_getEnumDeclIntegerType(GoCXCursor c);
-unsigned tinygo_clang_Cursor_isAnonymous(GoCXCursor c);
 unsigned tinygo_clang_Cursor_isBitField(GoCXCursor c);
-unsigned tinygo_clang_Cursor_isMacroFunctionLike(GoCXCursor c);

-// Fix some warnings on Windows ARM. Without the __declspec(dllexport), it gives warnings like this:
-//     In file included from _cgo_export.c:4:
-//     cgo-gcc-export-header-prolog:49:34: warning: redeclaration of 'tinygo_clang_globals_visitor' should not add 'dllexport' attribute [-Wdll-attribute-on-redeclaration]
-//     libclang.go:68:5: note: previous declaration is here
-// See: https://github.com/golang/go/issues/49721
-#if defined(_WIN32)
-#define CGO_DECL __declspec(dllexport)
-#else
-#define CGO_DECL
-#endif
-
-CGO_DECL
 int tinygo_clang_globals_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
-CGO_DECL
 int tinygo_clang_struct_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
-CGO_DECL
+int tinygo_clang_enum_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
 void tinygo_clang_inclusion_visitor(CXFile included_file, CXSourceLocation *inclusion_stack, unsigned include_len, CXClientData client_data);
 */
 import "C"
@@ -219,7 +203,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		numArgs := int(C.tinygo_clang_Cursor_getNumArguments(c))
 		obj := &ast.Object{
 			Kind: ast.Fun,
-			Name: "_Cgo_" + name,
+			Name: "C." + name,
 		}
 		exportName := name
 		localName := name
@@ -257,7 +241,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			},
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "_Cgo_" + localName,
+				Name:    "C." + localName,
 				Obj:     obj,
 			},
 			Type: &ast.FuncType{
@@ -269,18 +253,10 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			},
 		}
-		var doc []string
 		if C.clang_isFunctionTypeVariadic(cursorType) != 0 {
-			doc = append(doc, "//go:variadic")
-		}
-		if _, ok := f.noescapingFuncs[name]; ok {
-			doc = append(doc, "//go:noescape")
-			f.noescapingFuncs[name].used = true
-		}
-		if len(doc) != 0 {
 			decl.Doc.List = append(decl.Doc.List, &ast.Comment{
 				Slash: pos - 1,
-				Text:  strings.Join(doc, "\n"),
+				Text:  "//go:variadic",
 			})
 		}
 		for i := 0; i < numArgs; i++ {
@@ -319,7 +295,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		return decl, stringSignature
 	case C.CXCursor_StructDecl, C.CXCursor_UnionDecl:
 		typ := f.makeASTRecordType(c, pos)
-		typeName := "_Cgo_" + name
+		typeName := "C." + name
 		typeExpr := typ.typeExpr
 		if typ.unionSize != 0 {
 			// Convert to a single-field struct type.
@@ -340,7 +316,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		obj.Decl = typeSpec
 		return typeSpec, typ
 	case C.CXCursor_TypedefDecl:
-		typeName := "_Cgo_" + name
+		typeName := "C." + name
 		underlyingType := C.tinygo_clang_getTypedefDeclUnderlyingType(c)
 		obj := &ast.Object{
 			Kind: ast.Typ,
@@ -378,12 +354,12 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		}
 		obj := &ast.Object{
 			Kind: ast.Var,
-			Name: "_Cgo_" + name,
+			Name: "C." + name,
 		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
 				Obj:     obj,
 			}},
 			Type: typeExpr,
@@ -392,8 +368,42 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	case C.CXCursor_MacroDefinition:
-		tokenPos, value := f.getMacro(c)
-		expr, scannerError := parseConst(tokenPos, f.fset, value, nil, token.NoPos, f)
+		sourceRange := C.tinygo_clang_getCursorExtent(c)
+		start := C.clang_getRangeStart(sourceRange)
+		end := C.clang_getRangeEnd(sourceRange)
+		var file, endFile C.CXFile
+		var startOffset, endOffset C.unsigned
+		C.clang_getExpansionLocation(start, &file, nil, nil, &startOffset)
+		if file == nil {
+			f.addError(pos, "internal error: could not find file where macro is defined")
+			return nil, nil
+		}
+		C.clang_getExpansionLocation(end, &endFile, nil, nil, &endOffset)
+		if file != endFile {
+			f.addError(pos, "internal error: expected start and end location of a macro to be in the same file")
+			return nil, nil
+		}
+		if startOffset > endOffset {
+			f.addError(pos, "internal error: start offset of macro is after end offset")
+			return nil, nil
+		}
+
+		// read file contents and extract the relevant byte range
+		tu := C.tinygo_clang_Cursor_getTranslationUnit(c)
+		var size C.size_t
+		sourcePtr := C.clang_getFileContents(tu, file, &size)
+		if endOffset >= C.uint(size) {
+			f.addError(pos, "internal error: end offset of macro lies after end of file")
+			return nil, nil
+		}
+		source := string(((*[1 << 28]byte)(unsafe.Pointer(sourcePtr)))[startOffset:endOffset:endOffset])
+		if !strings.HasPrefix(source, name) {
+			f.addError(pos, fmt.Sprintf("internal error: expected macro value to start with %#v, got %#v", name, source))
+			return nil, nil
+		}
+		value := source[len(name):]
+		// Try to convert this #define into a Go constant expression.
+		expr, scannerError := parseConst(pos+token.Pos(len(name)), f.fset, value)
 		if scannerError != nil {
 			f.errors = append(f.errors, *scannerError)
 			return nil, nil
@@ -407,12 +417,12 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		}
 		obj := &ast.Object{
 			Kind: ast.Con,
-			Name: "_Cgo_" + name,
+			Name: "C." + name,
 		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
 				Obj:     obj,
 			}},
 			Values: []ast.Expr{expr},
@@ -423,7 +433,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 	case C.CXCursor_EnumDecl:
 		obj := &ast.Object{
 			Kind: ast.Typ,
-			Name: "_Cgo_" + name,
+			Name: "C." + name,
 		}
 		underlying := C.tinygo_clang_getEnumDeclIntegerType(c)
 		// TODO: gc's CGo implementation uses types such as `uint32` for enums
@@ -431,7 +441,7 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
 				Obj:     obj,
 			},
 			Assign: pos,
@@ -454,12 +464,12 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 		}
 		obj := &ast.Object{
 			Kind: ast.Con,
-			Name: "_Cgo_" + name,
+			Name: "C." + name,
 		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
 				Obj:     obj,
 			}},
 			Values: []ast.Expr{expr},
@@ -473,62 +483,6 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 	}
 }

-// Return whether this is a macro that's also function-like, like this:
-//
-//	#define add(a, b) (a+b)
-func (f *cgoFile) isFunctionLikeMacro(c clangCursor) bool {
-	if C.tinygo_clang_getCursorKind(c) != C.CXCursor_MacroDefinition {
-		return false
-	}
-	return C.tinygo_clang_Cursor_isMacroFunctionLike(c) != 0
-}
-
-// Get the macro value: the position in the source file and the string value of
-// the macro.
-func (f *cgoFile) getMacro(c clangCursor) (pos token.Pos, value string) {
-	// Extract tokens from the Clang tokenizer.
-	// See: https://stackoverflow.com/a/19074846/559350
-	sourceRange := C.tinygo_clang_getCursorExtent(c)
-	tu := C.tinygo_clang_Cursor_getTranslationUnit(c)
-	var rawTokens *C.CXToken
-	var numTokens C.unsigned
-	C.clang_tokenize(tu, sourceRange, &rawTokens, &numTokens)
-	tokens := unsafe.Slice(rawTokens, numTokens)
-	defer C.clang_disposeTokens(tu, rawTokens, numTokens)
-
-	// Convert this range of tokens back to source text.
-	// Ugly, but it works well enough.
-	sourceBuf := &bytes.Buffer{}
-	var startOffset int
-	for i, token := range tokens {
-		spelling := getString(C.clang_getTokenSpelling(tu, token))
-		location := C.clang_getTokenLocation(tu, token)
-		var tokenOffset C.unsigned
-		C.clang_getExpansionLocation(location, nil, nil, nil, &tokenOffset)
-		if i == 0 {
-			// The first token is the macro name itself.
-			// Skip it (after using its location).
-			startOffset = int(tokenOffset)
-		} else {
-			// Later tokens are the macro contents.
-			for int(tokenOffset) > (startOffset + sourceBuf.Len()) {
-				// Pad the source text with whitespace (that must have been
-				// present in the original source as well).
-				sourceBuf.WriteByte(' ')
-			}
-			sourceBuf.WriteString(spelling)
-		}
-	}
-	value = sourceBuf.String()
-
-	// Obtain the position of this token. This is the position of the first
-	// character in the 'value' string and is used to report errors at the
-	// correct location in the source file.
-	pos = f.getCursorPosition(c)
-
-	return
-}
-
 func getString(clangString C.CXString) (s string) {
 	rawString := C.clang_getCString(clangString)
 	s = C.GoString(rawString)
@@ -579,26 +533,6 @@ func tinygo_clang_globals_visitor(c, parent C.GoCXCursor, client_data C.CXClient
 	return C.CXChildVisit_Continue
 }

-// Get the precise location in the source code. Used for uniquely identifying
-// source locations.
-func (f *cgoFile) getUniqueLocationID(pos token.Pos, cursor C.GoCXCursor) interface{} {
-	clangLocation := C.tinygo_clang_getCursorLocation(cursor)
-	var file C.CXFile
-	var line C.unsigned
-	var column C.unsigned
-	C.clang_getFileLocation(clangLocation, &file, &line, &column, nil)
-	location := token.Position{
-		Filename: getString(C.clang_getFileName(file)),
-		Line:     int(line),
-		Column:   int(column),
-	}
-	if location.Filename == "" || location.Line == 0 {
-		// Not sure when this would happen, but protect from it anyway.
-		f.addError(pos, "could not find file/line information")
-	}
-	return location
-}
-
 // getCursorPosition returns a usable token.Pos from a libclang cursor.
 func (p *cgoPackage) getCursorPosition(cursor C.GoCXCursor) token.Pos {
 	return p.getClangLocationPosition(C.tinygo_clang_getCursorLocation(cursor), C.tinygo_clang_Cursor_getTranslationUnit(cursor))
@@ -634,13 +568,6 @@ func (p *cgoPackage) getClangLocationPosition(location C.CXSourceLocation, tu C.
 		f := p.fset.AddFile(filename, -1, int(size))
 		f.SetLines(lines)
 		p.tokenFiles[filename] = f
-		// Add dummy file AST, to satisfy the type checker.
-		astFile := &ast.File{
-			Package: f.Pos(0),
-			Name:    ast.NewIdent(p.packageName),
-		}
-		setASTFileFields(astFile, f.Pos(0), f.Pos(int(size)))
-		p.cgoFiles = append(p.cgoFiles, astFile)
 	}
 	positionFile := p.tokenFiles[filename]

@@ -687,6 +614,13 @@ func (p *cgoPackage) addErrorAfter(pos token.Pos, after, msg string) {

 // addErrorAt is a utility function to add an error to the list of errors.
 func (p *cgoPackage) addErrorAt(position token.Position, msg string) {
+	if filepath.IsAbs(position.Filename) {
+		// Relative paths for readability, like other Go parser errors.
+		relpath, err := filepath.Rel(p.currentDir, position.Filename)
+		if err == nil {
+			position.Filename = relpath
+		}
+	}
 	p.errors = append(p.errors, scanner.Error{
 		Pos: position,
 		Msg: msg,
@@ -699,19 +633,8 @@ func (p *cgoPackage) addErrorAt(position token.Position, msg string) {
 func (f *cgoFile) makeDecayingASTType(typ C.CXType, pos token.Pos) ast.Expr {
 	// Strip typedefs, if any.
 	underlyingType := typ
-	if underlyingType.kind == C.CXType_Elaborated {
-		// Starting with LLVM 16, the elaborated type is used for more types.
-		// According to the Clang documentation, the elaborated type has no
-		// semantic meaning so can be stripped (it is used to better convey type
-		// name information).
-		// Source:
-		// https://clang.llvm.org/doxygen/classclang_1_1ElaboratedType.html#details
-		// > The type itself is always "sugar", used to express what was written
-		// > in the source code but containing no additional semantic information.
-		underlyingType = C.clang_Type_getNamedType(underlyingType)
-	}
 	if underlyingType.kind == C.CXType_Typedef {
-		c := C.tinygo_clang_getTypeDeclaration(underlyingType)
+		c := C.tinygo_clang_getTypeDeclaration(typ)
 		underlyingType = C.tinygo_clang_getTypedefDeclUnderlyingType(c)
 		// TODO: support a chain of typedefs. At the moment, it seems to get
 		// stuck in an endless loop when trying to get to the most underlying
@@ -745,27 +668,27 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 	var typeName string
 	switch typ.kind {
 	case C.CXType_Char_S, C.CXType_Char_U:
-		typeName = "_Cgo_char"
+		typeName = "C.char"
 	case C.CXType_SChar:
-		typeName = "_Cgo_schar"
+		typeName = "C.schar"
 	case C.CXType_UChar:
-		typeName = "_Cgo_uchar"
+		typeName = "C.uchar"
 	case C.CXType_Short:
-		typeName = "_Cgo_short"
+		typeName = "C.short"
 	case C.CXType_UShort:
-		typeName = "_Cgo_ushort"
+		typeName = "C.ushort"
 	case C.CXType_Int:
-		typeName = "_Cgo_int"
+		typeName = "C.int"
 	case C.CXType_UInt:
-		typeName = "_Cgo_uint"
+		typeName = "C.uint"
 	case C.CXType_Long:
-		typeName = "_Cgo_long"
+		typeName = "C.long"
 	case C.CXType_ULong:
-		typeName = "_Cgo_ulong"
+		typeName = "C.ulong"
 	case C.CXType_LongLong:
-		typeName = "_Cgo_longlong"
+		typeName = "C.longlong"
 	case C.CXType_ULongLong:
-		typeName = "_Cgo_ulonglong"
+		typeName = "C.ulonglong"
 	case C.CXType_Bool:
 		typeName = "bool"
 	case C.CXType_Float, C.CXType_Double, C.CXType_LongDouble:
@@ -845,8 +768,6 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			return f.makeASTType(underlying, pos)
 		case C.CXType_Enum:
 			return f.makeASTType(underlying, pos)
-		case C.CXType_Typedef:
-			return f.makeASTType(underlying, pos)
 		default:
 			typeKindSpelling := getString(C.clang_getTypeKindSpelling(underlying.kind))
 			f.addError(pos, fmt.Sprintf("unknown elaborated type (libclang type kind %s)", typeKindSpelling))
@@ -865,9 +786,22 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			// makeASTRecordType will create an appropriate error.
 			cgoRecordPrefix = "record_"
 		}
-		if name == "" || C.tinygo_clang_Cursor_isAnonymous(cursor) != 0 {
+		if name == "" {
 			// Anonymous record, probably inside a typedef.
-			location := f.getUniqueLocationID(pos, cursor)
+			clangLocation := C.tinygo_clang_getCursorLocation(cursor)
+			var file C.CXFile
+			var line C.unsigned
+			var column C.unsigned
+			C.clang_getFileLocation(clangLocation, &file, &line, &column, nil)
+			location := token.Position{
+				Filename: getString(C.clang_getFileName(file)),
+				Line:     int(line),
+				Column:   int(column),
+			}
+			if location.Filename == "" || location.Line == 0 {
+				// Not sure when this would happen, but protect from it anyway.
+				f.addError(pos, "could not find file/line information")
+			}
 			name = f.getUnnamedDeclName("_Ctype_"+cgoRecordPrefix+"__", location)
 		} else {
 			name = cgoRecordPrefix + name
@@ -880,9 +814,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 		cursor := C.tinygo_clang_getTypeDeclaration(typ)
 		name := getString(C.tinygo_clang_getCursorSpelling(cursor))
 		if name == "" {
-			// Anonymous enum, probably inside a typedef.
-			location := f.getUniqueLocationID(pos, cursor)
-			name = f.getUnnamedDeclName("_Ctype_enum___", location)
+			name = f.getUnnamedDeclName("_Ctype_enum___", cursor)
 		} else {
 			name = "enum_" + name
 		}
@@ -896,7 +828,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 		typeSpelling := getString(C.clang_getTypeSpelling(typ))
 		typeKindSpelling := getString(C.clang_getTypeKindSpelling(typ.kind))
 		f.addError(pos, fmt.Sprintf("unknown C type: %v (libclang type kind %s)", typeSpelling, typeKindSpelling))
-		typeName = "_Cgo_<unknown>"
+		typeName = "C.<unknown>"
 	}
 	return &ast.Ident{
 		NamePos: pos,
@@ -913,7 +845,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 	var goName string
 	typeSize := C.clang_Type_getSizeOf(underlyingType)
 	switch name {
-	case "_Cgo_char":
+	case "C.char":
 		if typeSize != 1 {
 			// This happens for some very special purpose architectures
 			// (DSPs etc.) that are not currently targeted.
@@ -926,7 +858,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case C.CXType_Char_U:
 			goName = "uint8"
 		}
-	case "_Cgo_schar", "_Cgo_short", "_Cgo_int", "_Cgo_long", "_Cgo_longlong":
+	case "C.schar", "C.short", "C.int", "C.long", "C.longlong":
 		switch typeSize {
 		case 1:
 			goName = "int8"
@@ -937,7 +869,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case 8:
 			goName = "int64"
 		}
-	case "_Cgo_uchar", "_Cgo_ushort", "_Cgo_uint", "_Cgo_ulong", "_Cgo_ulonglong":
+	case "C.uchar", "C.ushort", "C.uint", "C.ulong", "C.ulonglong":
 		switch typeSize {
 		case 1:
 			goName = "uint8"
@@ -0,0 +1,16 @@
+//go:build !byollvm
+// +build !byollvm
+
+package cgo
+
+/*
+#cgo linux        CFLAGS:  -I/usr/lib/llvm-14/include
+#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@14/include
+#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@14/include
+#cgo freebsd      CFLAGS:  -I/usr/local/llvm14/include
+#cgo linux        LDFLAGS: -L/usr/lib/llvm-14/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@14/lib -lclang -lffi
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@14/lib -lclang -lffi
+#cgo freebsd      LDFLAGS: -L/usr/local/llvm14/lib -lclang
+*/
+import "C"
@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm15
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/lib/llvm-15/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@15/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@15/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm15/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-15/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@15/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@15/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm15/lib -lclang
-*/
-import "C"
@@ -1,21 +0,0 @@
-//go:build !byollvm && llvm16
-
-package cgo
-
-// As of 2023-05-05, there is a packaging issue with LLVM 16 on Debian:
-// https://github.com/llvm/llvm-project/issues/62199
-// A workaround is to fix this locally, using something like this:
-//
-//   ln -sf ../../x86_64-linux-gnu/libclang-16.so.1 /usr/lib/llvm-16/lib/libclang.so
-
-/*
-#cgo linux        CFLAGS:  -I/usr/lib/llvm-16/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@16/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@16/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm16/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-16/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@16/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@16/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm16/lib -lclang
-*/
-import "C"
@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm17
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-17 -I/usr/include/llvm-c-17 -I/usr/lib/llvm-17/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@17/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@17/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm17/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-17/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@17/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@17/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm17/lib -lclang
-*/
-import "C"
@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm18
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-18 -I/usr/include/llvm-c-18 -I/usr/lib/llvm-18/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@18/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@18/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm18/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-18/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@18/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@18/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm18/lib -lclang
-*/
-import "C"
@@ -1,15 +0,0 @@
-//go:build !byollvm && !llvm15 && !llvm16 && !llvm17 && !llvm18
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-19 -I/usr/include/llvm-c-19 -I/usr/lib/llvm-19/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@19/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@19/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm19/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-19/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@19/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@19/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm19/lib -lclang
-*/
-import "C"
@@ -77,14 +77,6 @@ CXType tinygo_clang_getEnumDeclIntegerType(CXCursor c) {
 	return clang_getEnumDeclIntegerType(c);
 }

-unsigned tinygo_clang_Cursor_isAnonymous(CXCursor c) {
-	return clang_Cursor_isAnonymous(c);
-}
-
 unsigned tinygo_clang_Cursor_isBitField(CXCursor c) {
 	return clang_Cursor_isBitField(c);
-}
-
-unsigned tinygo_clang_Cursor_isMacroFunctionLike(CXCursor c) {
-	return clang_Cursor_isMacroFunctionLike(c);
-}
+}
@@ -142,7 +142,6 @@ var validLinkerFlags = []*regexp.Regexp{
 	re(`-L([^@\-].*)`),
 	re(`-O`),
 	re(`-O([^@\-].*)`),
-	re(`--export=([^@\-].*)`),
 	re(`-f(no-)?(pic|PIC|pie|PIE)`),
 	re(`-f(no-)?openmp(-simd)?`),
 	re(`-fsanitize=([^@\-].*)`),
@@ -108,7 +108,6 @@ var goodLinkerFlags = [][]string{
 	{"-Fbar"},
 	{"-lbar"},
 	{"-Lbar"},
-	{"--export=my_symbol"},
 	{"-fpic"},
 	{"-fno-pic"},
 	{"-fPIC"},
@@ -1,54 +1,39 @@
 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
@@ -3,26 +3,10 @@ package main
 /*
 #define foo 3
 #define bar foo
-
-#define unreferenced 4
-#define referenced unreferenced
-
-#define fnlike() 5
-#define fnlike_val fnlike()
-#define square(n) (n*n)
-#define square_val square(20)
-#define add(a, b) (a + b)
-#define add_val add(3, 5)
 */
 import "C"

 const (
 	Foo = C.foo
 	Bar = C.bar
-
-	Baz = C.referenced
-
-	fnlike = C.fnlike_val
-	square = C.square_val
-	add    = C.add_val
 )
@@ -1,62 +1,42 @@
 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )

-const _Cgo_foo = 3
-const _Cgo_bar = _Cgo_foo
-const _Cgo_unreferenced = 4
-const _Cgo_referenced = _Cgo_unreferenced
-const _Cgo_fnlike_val = 5
-const _Cgo_square_val = (20 * 20)
-const _Cgo_add_val = (3 + 5)
+const C.foo = 3
+const C.bar = C.foo
@@ -10,35 +10,20 @@ typedef struct {

 typedef someType noType; // undefined type

-// Some invalid noescape lines
-#cgo noescape
-#cgo noescape foo bar
-#cgo noescape unusedFunction
-
 #define SOME_CONST_1 5) // invalid const syntax
 #define SOME_CONST_2 6) // const not used (so no error)
 #define SOME_CONST_3 1234 // const too large for byte
-#define   SOME_CONST_b      3   ) // const with lots of weird whitespace (to test error locations)
-#  define SOME_CONST_startspace 3)
 */
 //
 //
 // #define SOME_CONST_4 8) // after some empty lines
-// #cgo CFLAGS: -DSOME_PARAM_CONST_invalid=3/+3
-// #cgo CFLAGS: -DSOME_PARAM_CONST_valid=3+4
 import "C"

 // #warning another warning
 import "C"

-// #define add(a, b) (a+b)
-// #define add_toomuch add(1, 2, 3)
-// #define add_toolittle add(1)
-import "C"
-
 // Make sure that errors for the following lines won't change with future
 // additions to the CGo preamble.
-//
 //line errors.go:100
 var (
 	// constant too large
@@ -53,15 +38,4 @@ var (
 	_ byte = C.SOME_CONST_3

 	_ = C.SOME_CONST_4
-
-	_ = C.SOME_CONST_b
-
-	_ = C.SOME_CONST_startspace
-
-	// constants passed by a command line parameter
-	_ = C.SOME_PARAM_CONST_invalid
-	_ = C.SOME_PARAM_CONST_valid
-
-	_ = C.add_toomuch
-	_ = C.add_toolittle
 )
@@ -1,89 +1,60 @@
 // CGo errors:
-//     testdata/errors.go:14:1: missing function name in #cgo noescape line
-//     testdata/errors.go:15:1: multiple function names in #cgo noescape line
 //     testdata/errors.go:4:2: warning: some warning
 //     testdata/errors.go:11:9: error: unknown type name 'someType'
-//     testdata/errors.go:31:5: warning: another warning
-//     testdata/errors.go:18:23: unexpected token ), expected end of expression
-//     testdata/errors.go:26:26: unexpected token ), expected end of expression
-//     testdata/errors.go:21:33: unexpected token ), expected end of expression
-//     testdata/errors.go:22:34: unexpected token ), expected end of expression
-//     -: unexpected token INT, expected end of expression
-//     testdata/errors.go:35:35: unexpected number of parameters: expected 2, got 3
-//     testdata/errors.go:36:31: unexpected number of parameters: expected 2, got 1
-//     testdata/errors.go:3:1: function "unusedFunction" in #cgo noescape line is not used
+//     testdata/errors.go:22:5: warning: another warning
+//     testdata/errors.go:13:23: unexpected token ), expected end of expression
+//     testdata/errors.go:19:26: unexpected token ), expected end of expression

 // Type checking errors after CGo processing:
-//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as _Cgo_char value in variable declaration (overflows)
+//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as C.char value in variable declaration (overflows)
 //     testdata/errors.go:105: unknown field z in struct literal
-//     testdata/errors.go:108: undefined: _Cgo_SOME_CONST_1
-//     testdata/errors.go:110: cannot use _Cgo_SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
-//     testdata/errors.go:112: undefined: _Cgo_SOME_CONST_4
-//     testdata/errors.go:114: undefined: _Cgo_SOME_CONST_b
-//     testdata/errors.go:116: undefined: _Cgo_SOME_CONST_startspace
-//     testdata/errors.go:119: undefined: _Cgo_SOME_PARAM_CONST_invalid
-//     testdata/errors.go:122: undefined: _Cgo_add_toomuch
-//     testdata/errors.go:123: undefined: _Cgo_add_toolittle
+//     testdata/errors.go:108: undeclared name: C.SOME_CONST_1
+//     testdata/errors.go:110: cannot use C.SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
+//     testdata/errors.go:112: undeclared name: C.SOME_CONST_4

 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
-type _Cgo_struct_point_t struct {
-	x _Cgo_int
-	y _Cgo_int
+type C._Ctype_struct___0 struct {
+	x C.int
+	y C.int
 }
-type _Cgo_point_t = _Cgo_struct_point_t
+type C.point_t = C._Ctype_struct___0

-const _Cgo_SOME_CONST_3 = 1234
-const _Cgo_SOME_PARAM_CONST_valid = 3 + 4
+const C.SOME_CONST_3 = 1234
@@ -5,58 +5,43 @@

 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )

-const _Cgo_BAR = 3
-const _Cgo_FOO_H = 1
+const C.BAR = 3
+const C.FOO_H = 1
@@ -9,10 +9,6 @@ static void staticfunc(int x);

 // Global variable signatures.
 extern int someValue;
-
-void notEscapingFunction(int *a);
-
-#cgo noescape notEscapingFunction
 */
 import "C"

@@ -22,7 +18,6 @@ func accessFunctions() {
 	C.variadic0()
 	C.variadic2(3, 5)
 	C.staticfunc(3)
-	C.notEscapingFunction(nil)
 }

 func accessGlobals() {
@@ -1,84 +1,64 @@
 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )

 //export foo
-func _Cgo_foo(a _Cgo_int, b _Cgo_int) _Cgo_int
+func C.foo(a C.int, b C.int) C.int

-var _Cgo_foo$funcaddr unsafe.Pointer
+var C.foo$funcaddr unsafe.Pointer

 //export variadic0
 //go:variadic
-func _Cgo_variadic0()
+func C.variadic0()

-var _Cgo_variadic0$funcaddr unsafe.Pointer
+var C.variadic0$funcaddr unsafe.Pointer

 //export variadic2
 //go:variadic
-func _Cgo_variadic2(x _Cgo_int, y _Cgo_int)
+func C.variadic2(x C.int, y C.int)

-var _Cgo_variadic2$funcaddr unsafe.Pointer
+var C.variadic2$funcaddr unsafe.Pointer

 //export _Cgo_static_173c95a79b6df1980521_staticfunc
-func _Cgo_staticfunc!symbols.go(x _Cgo_int)
+func C.staticfunc!symbols.go(x C.int)

-var _Cgo_staticfunc!symbols.go$funcaddr unsafe.Pointer
+var C.staticfunc!symbols.go$funcaddr unsafe.Pointer

-//export notEscapingFunction
-//go:noescape
-func _Cgo_notEscapingFunction(a *_Cgo_int)
-
-var _Cgo_notEscapingFunction$funcaddr unsafe.Pointer
 //go:extern someValue
-var _Cgo_someValue _Cgo_int
+var C.someValue C.int
@@ -112,10 +112,6 @@ import "C"
 import "C"

 var (
-	// aliases
-	_ C.float
-	_ C.double
-
 	// Simple typedefs.
 	_ C.myint

@@ -1,166 +1,149 @@
 package main

-import "syscall"
 import "unsafe"

 var _ unsafe.Pointer

-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char

-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string

-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string

-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }

-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte

-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }

 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
-type _Cgo_myint = _Cgo_int
-type _Cgo_struct_point2d_t struct {
-	x _Cgo_int
-	y _Cgo_int
+type C.myint = C.int
+type C._Ctype_struct___0 struct {
+	x C.int
+	y C.int
 }
-type _Cgo_point2d_t = _Cgo_struct_point2d_t
-type _Cgo_struct_point3d struct {
-	x _Cgo_int
-	y _Cgo_int
-	z _Cgo_int
+type C.point2d_t = C._Ctype_struct___0
+type C.struct_point3d struct {
+	x C.int
+	y C.int
+	z C.int
 }
-type _Cgo_point3d_t = _Cgo_struct_point3d
-type _Cgo_struct_type1 struct {
-	_type   _Cgo_int
-	__type  _Cgo_int
-	___type _Cgo_int
+type C.point3d_t = C.struct_point3d
+type C.struct_type1 struct {
+	_type   C.int
+	__type  C.int
+	___type C.int
 }
-type _Cgo_struct_type2 struct{ _type _Cgo_int }
-type _Cgo_union_union1_t struct{ i _Cgo_int }
-type _Cgo_union1_t = _Cgo_union_union1_t
-type _Cgo_union_union3_t struct{ $union uint64 }
+type C.struct_type2 struct{ _type C.int }
+type C._Ctype_union___1 struct{ i C.int }
+type C.union1_t = C._Ctype_union___1
+type C._Ctype_union___2 struct{ $union uint64 }

-func (union *_Cgo_union_union3_t) unionfield_i() *_Cgo_int {
-	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___2) unionfield_i() *C.int {
+	return (*C.int)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union3_t) unionfield_d() *float64 {
+func (union *C._Ctype_union___2) unionfield_d() *float64 {
 	return (*float64)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union3_t) unionfield_s() *_Cgo_short {
-	return (*_Cgo_short)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___2) unionfield_s() *C.short {
+	return (*C.short)(unsafe.Pointer(&union.$union))
 }

-type _Cgo_union3_t = _Cgo_union_union3_t
-type _Cgo_union_union2d struct{ $union [2]uint64 }
+type C.union3_t = C._Ctype_union___2
+type C.union_union2d struct{ $union [2]uint64 }

-func (union *_Cgo_union_union2d) unionfield_i() *_Cgo_int {
-	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
-}
-func (union *_Cgo_union_union2d) unionfield_d() *[2]float64 {
+func (union *C.union_union2d) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
+func (union *C.union_union2d) unionfield_d() *[2]float64 {
 	return (*[2]float64)(unsafe.Pointer(&union.$union))
 }

-type _Cgo_union2d_t = _Cgo_union_union2d
-type _Cgo_union_unionarray_t struct{ arr [10]_Cgo_uchar }
-type _Cgo_unionarray_t = _Cgo_union_unionarray_t
-type _Cgo__Ctype_union___0 struct{ $union [3]uint32 }
+type C.union2d_t = C.union_union2d
+type C._Ctype_union___3 struct{ arr [10]C.uchar }
+type C.unionarray_t = C._Ctype_union___3
+type C._Ctype_union___5 struct{ $union [3]uint32 }

-func (union *_Cgo__Ctype_union___0) unionfield_area() *_Cgo_point2d_t {
-	return (*_Cgo_point2d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___5) unionfield_area() *C.point2d_t {
+	return (*C.point2d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo__Ctype_union___0) unionfield_solid() *_Cgo_point3d_t {
-	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___5) unionfield_solid() *C.point3d_t {
+	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }

-type _Cgo_struct_struct_nested_t struct {
-	begin _Cgo_point2d_t
-	end   _Cgo_point2d_t
-	tag   _Cgo_int
+type C._Ctype_struct___4 struct {
+	begin C.point2d_t
+	end   C.point2d_t
+	tag   C.int

-	coord _Cgo__Ctype_union___0
+	coord C._Ctype_union___5
 }
-type _Cgo_struct_nested_t = _Cgo_struct_struct_nested_t
-type _Cgo_union_union_nested_t struct{ $union [2]uint64 }
+type C.struct_nested_t = C._Ctype_struct___4
+type C._Ctype_union___6 struct{ $union [2]uint64 }

-func (union *_Cgo_union_union_nested_t) unionfield_point() *_Cgo_point3d_t {
-	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_point() *C.point3d_t {
+	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union_nested_t) unionfield_array() *_Cgo_unionarray_t {
-	return (*_Cgo_unionarray_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_array() *C.unionarray_t {
+	return (*C.unionarray_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union_nested_t) unionfield_thing() *_Cgo_union3_t {
-	return (*_Cgo_union3_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_thing() *C.union3_t {
+	return (*C.union3_t)(unsafe.Pointer(&union.$union))
 }

-type _Cgo_union_nested_t = _Cgo_union_union_nested_t
-type _Cgo_enum_option = _Cgo_int
-type _Cgo_option_t = _Cgo_enum_option
-type _Cgo_enum_option2_t = _Cgo_uint
-type _Cgo_option2_t = _Cgo_enum_option2_t
-type _Cgo_struct_types_t struct {
+type C.union_nested_t = C._Ctype_union___6
+type C.enum_option = C.int
+type C.option_t = C.enum_option
+type C._Ctype_enum___7 = C.uint
+type C.option2_t = C._Ctype_enum___7
+type C._Ctype_struct___8 struct {
 	f   float32
 	d   float64
-	ptr *_Cgo_int
+	ptr *C.int
 }
-type _Cgo_types_t = _Cgo_struct_types_t
-type _Cgo_myIntArray = [10]_Cgo_int
-type _Cgo_struct_bitfield_t struct {
-	start        _Cgo_uchar
-	__bitfield_1 _Cgo_uchar
+type C.types_t = C._Ctype_struct___8
+type C.myIntArray = [10]C.int
+type C._Ctype_struct___9 struct {
+	start        C.uchar
+	__bitfield_1 C.uchar

-	d _Cgo_uchar
-	e _Cgo_uchar
+	d C.uchar
+	e C.uchar
 }

-func (s *_Cgo_struct_bitfield_t) bitfield_a() _Cgo_uchar { return s.__bitfield_1 & 0x1f }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_a(value _Cgo_uchar) {
+func (s *C._Ctype_struct___9) bitfield_a() C.uchar { return s.__bitfield_1 & 0x1f }
+func (s *C._Ctype_struct___9) set_bitfield_a(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x1f | value&0x1f<<0
 }
-func (s *_Cgo_struct_bitfield_t) bitfield_b() _Cgo_uchar {
+func (s *C._Ctype_struct___9) bitfield_b() C.uchar {
 	return s.__bitfield_1 >> 5 & 0x1
 }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_b(value _Cgo_uchar) {
+func (s *C._Ctype_struct___9) set_bitfield_b(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x20 | value&0x1<<5
 }
-func (s *_Cgo_struct_bitfield_t) bitfield_c() _Cgo_uchar {
+func (s *C._Ctype_struct___9) bitfield_c() C.uchar {
 	return s.__bitfield_1 >> 6
 }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_c(value _Cgo_uchar,
+func (s *C._Ctype_struct___9) set_bitfield_c(value C.uchar,

 ) { s.__bitfield_1 = s.__bitfield_1&0x3f | value<<6 }

-type _Cgo_bitfield_t = _Cgo_struct_bitfield_t
+type C.bitfield_t = C._Ctype_struct___9
@@ -8,28 +8,18 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"strconv"
 	"strings"

 	"github.com/google/shlex"
 	"github.com/tinygo-org/tinygo/goenv"
 )

-// Library versions. Whenever an existing library is changed, this number should
-// be added/increased so that existing caches are invalidated.
-//
-// (This is a bit of a layering violation, this should really be part of the
-// builder.Library struct but that's hard to do since we want to know the
-// library path in advance in several places).
-var libVersions = map[string]int{
-	"musl": 3,
-}
-
 // Config keeps all configuration affecting the build in a single struct.
 type Config struct {
 	Options        *Options
 	Target         *TargetSpec
 	GoMinorVersion int
+	ClangHeaders   string // Clang built-in header include path
 	TestConfig     TestConfig
 }

@@ -44,17 +34,6 @@ func (c *Config) CPU() string {
 	return c.Target.CPU
 }

-// The current build mode (like the `-buildmode` command line flag).
-func (c *Config) BuildMode() string {
-	if c.Options.BuildMode != "" {
-		return c.Options.BuildMode
-	}
-	if c.Target.BuildMode != "" {
-		return c.Target.BuildMode
-	}
-	return "default"
-}
-
 // Features returns a list of features this CPU supports. For example, for a
 // RISC-V processor, that could be "+a,+c,+m". For many targets, an empty list
 // will be returned.
@@ -68,12 +47,6 @@ func (c *Config) Features() string {
 	return c.Target.Features + "," + c.Options.LLVMFeatures
 }

-// ABI returns the -mabi= flag for this target (like -mabi=lp64). A zero-length
-// string is returned if the target doesn't specify an ABI.
-func (c *Config) ABI() string {
-	return c.Target.ABI
-}
-
 // GOOS returns the GOOS of the target. This might not always be the actual OS:
 // for example, bare-metal targets will usually pretend to be linux to get the
 // standard library to compile.
@@ -82,7 +55,7 @@ func (c *Config) GOOS() string {
 }

 // GOARCH returns the GOARCH of the target. This might not always be the actual
-// architecture: for example, the AVR target is not supported by the Go standard
+// archtecture: for example, the AVR target is not supported by the Go standard
 // library so such targets will usually pretend to be linux/arm.
 func (c *Config) GOARCH() string {
 	return c.Target.GOARCH
@@ -94,22 +67,9 @@ func (c *Config) GOARM() string {
 	return c.Options.GOARM
 }

-// GOMIPS will return the GOMIPS environment variable given to the compiler when
-// building a program.
-func (c *Config) GOMIPS() string {
-	return c.Options.GOMIPS
-}
-
 // BuildTags returns the complete list of build tags used during this build.
 func (c *Config) BuildTags() []string {
-	tags := append([]string(nil), c.Target.BuildTags...) // copy slice (avoid a race)
-	tags = append(tags, []string{
-		"tinygo",                                     // that's the compiler
-		"purego",                                     // to get various crypto packages to work
-		"osusergo",                                   // to get os/user to work
-		"math_big_pure_go",                           // to get math/big to work
-		"gc." + c.GC(), "scheduler." + c.Scheduler(), // used inside the runtime package
-		"serial." + c.Serial()}...) // used inside the machine package
+	tags := append(c.Target.BuildTags, []string{"tinygo", "math_big_pure_go", "gc." + c.GC(), "scheduler." + c.Scheduler(), "serial." + c.Serial()}...)
 	for i := 1; i <= c.GoMinorVersion; i++ {
 		tags = append(tags, fmt.Sprintf("go1.%d", i))
 	}
@@ -117,8 +77,14 @@ func (c *Config) BuildTags() []string {
 	return tags
 }

+// CgoEnabled returns true if (and only if) CGo is enabled. It is true by
+// default and false if CGO_ENABLED is set to "0".
+func (c *Config) CgoEnabled() bool {
+	return goenv.Get("CGO_ENABLED") == "1"
+}
+
 // GC returns the garbage collection strategy in use on this platform. Valid
-// values are "none", "leaking", "conservative" and "precise".
+// values are "none", "leaking", and "conservative".
 func (c *Config) GC() string {
 	if c.Options.GC != "" {
 		return c.Options.GC
@@ -133,7 +99,7 @@ func (c *Config) GC() string {
 // that can be traced by the garbage collector.
 func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
-	case "conservative", "custom", "precise":
+	case "conservative":
 		for _, tag := range c.BuildTags() {
 			if tag == "tinygo.wasm" {
 				return true
@@ -173,18 +139,18 @@ func (c *Config) Serial() string {

 // OptLevels returns the optimization level (0-2), size level (0-2), and inliner
 // threshold as used in the LLVM optimization pipeline.
-func (c *Config) OptLevel() (level string, speedLevel, sizeLevel int) {
+func (c *Config) OptLevels() (optLevel, sizeLevel int, inlinerThreshold uint) {
 	switch c.Options.Opt {
 	case "none", "0":
-		return "O0", 0, 0
+		return 0, 0, 0 // -O0
 	case "1":
-		return "O1", 1, 0
+		return 1, 0, 0 // -O1
 	case "2":
-		return "O2", 2, 0
+		return 2, 0, 225 // -O2
 	case "s":
-		return "Os", 2, 1
+		return 2, 1, 225 // -Os
 	case "z":
-		return "Oz", 2, 2 // default
+		return 2, 2, 5 // -Oz, default
 	default:
 		// This is not shown to the user: valid choices are already checked as
 		// part of Options.Verify(). It is here as a sanity check.
@@ -218,13 +184,23 @@ func (c *Config) StackSize() uint64 {
 	return c.Target.DefaultStackSize
 }

-// MaxStackAlloc returns the size of the maximum allocation to put on the stack vs heap.
-func (c *Config) MaxStackAlloc() uint64 {
-	if c.StackSize() > 32*1024 {
-		return 1024
+// UseThinLTO returns whether ThinLTO should be used for the given target. Some
+// targets (such as wasm) are not yet supported.
+// We should try and remove as many exceptions as possible in the future, so
+// that this optimization can be applied in more places.
+func (c *Config) UseThinLTO() bool {
+	parts := strings.Split(c.Triple(), "-")
+	if parts[0] == "wasm32" {
+		// wasm-ld doesn't seem to support ThinLTO yet.
+		return false
 	}
-
-	return 256
+	if parts[0] == "avr" || parts[0] == "xtensa" {
+		// These use external (GNU) linkers which might perhaps support ThinLTO
+		// through a plugin, but it's too much hassle to set up.
+		return false
+	}
+	// Other architectures support ThinLTO.
+	return true
 }

 // RP2040BootPatch returns whether the RP2040 boot patch should be applied that
@@ -236,54 +212,36 @@ func (c *Config) RP2040BootPatch() bool {
 	return false
 }

-// Return a canonicalized architecture name, so we don't have to deal with arm*
-// vs thumb* vs arm64.
-func CanonicalArchName(triple string) string {
+// MuslArchitecture returns the architecture name as used in musl libc. It is
+// usually the same as the first part of the LLVM triple, but not always.
+func MuslArchitecture(triple string) string {
 	arch := strings.Split(triple, "-")[0]
-	if arch == "arm64" {
-		return "aarch64"
-	}
 	if strings.HasPrefix(arch, "arm") || strings.HasPrefix(arch, "thumb") {
-		return "arm"
-	}
-	if arch == "mipsel" {
-		return "mips"
+		arch = "arm"
 	}
 	return arch
 }

-// MuslArchitecture returns the architecture name as used in musl libc. It is
-// usually the same as the first part of the LLVM triple, but not always.
-func MuslArchitecture(triple string) string {
-	return CanonicalArchName(triple)
-}
-
-// LibraryPath returns the path to the library build directory. The path will be
-// a library path in the cache directory (which might not yet be built).
-func (c *Config) LibraryPath(name string) string {
+// LibcPath returns the path to the libc directory. The libc path will be either
+// a precompiled libc shipped with a TinyGo build, or a libc path in the cache
+// directory (which might not yet be built).
+func (c *Config) LibcPath(name string) (path string, precompiled bool) {
 	archname := c.Triple()
 	if c.CPU() != "" {
 		archname += "-" + c.CPU()
 	}
-	if c.ABI() != "" {
-		archname += "-" + c.ABI()
-	}
-	if c.Target.SoftFloat {
-		archname += "-softfloat"
-	}
-	if name == "bdwgc" {
-		// Boehm GC is compiled against a particular libc.
-		archname += "-" + c.Target.Libc
-	}

-	// Append a version string, if this library has a version.
-	if v, ok := libVersions[name]; ok {
-		archname += "-v" + strconv.Itoa(v)
+	// Try to load a precompiled library.
+	precompiledDir := filepath.Join(goenv.Get("TINYGOROOT"), "pkg", archname, name)
+	if _, err := os.Stat(precompiledDir); err == nil {
+		// Found a precompiled library for this OS/architecture. Return the path
+		// directly.
+		return precompiledDir, true
 	}

 	// No precompiled library found. Determine the path name that will be used
 	// in the build cache.
-	return filepath.Join(goenv.Get("GOCACHE"), name+"-"+archname)
+	return filepath.Join(goenv.Get("GOCACHE"), name+"-"+archname), false
 }

 // DefaultBinaryExtension returns the default extension for binaries, such as
@@ -311,24 +269,58 @@ func (c *Config) DefaultBinaryExtension() string {

 // CFlags returns the flags to pass to the C compiler. This is necessary for CGo
 // preprocessing.
-func (c *Config) CFlags(libclang bool) []string {
+func (c *Config) CFlags() []string {
 	var cflags []string
 	for _, flag := range c.Target.CFlags {
 		cflags = append(cflags, strings.ReplaceAll(flag, "{root}", goenv.Get("TINYGOROOT")))
 	}
-	resourceDir := goenv.ClangResourceDir(libclang)
-	if resourceDir != "" {
-		// The resource directory contains the built-in clang headers like
-		// stdbool.h, stdint.h, float.h, etc.
-		// It is left empty if we're using an external compiler (that already
-		// knows these headers).
+	switch c.Target.Libc {
+	case "darwin-libSystem":
+		root := goenv.Get("TINYGOROOT")
 		cflags = append(cflags,
-			"-resource-dir="+resourceDir,
+			"--sysroot="+filepath.Join(root, "lib/macos-minimal-sdk/src"),
 		)
+	case "picolibc":
+		root := goenv.Get("TINYGOROOT")
+		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
+		path, _ := c.LibcPath("picolibc")
+		cflags = append(cflags,
+			"--sysroot="+path,
+			"-isystem", filepath.Join(path, "include"), // necessary for Xtensa
+			"-isystem", filepath.Join(picolibcDir, "include"),
+			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
+		)
+	case "musl":
+		root := goenv.Get("TINYGOROOT")
+		path, _ := c.LibcPath("musl")
+		arch := MuslArchitecture(c.Triple())
+		cflags = append(cflags,
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
+			"-isystem", filepath.Join(root, "lib", "musl", "include"),
+		)
+	case "wasi-libc":
+		root := goenv.Get("TINYGOROOT")
+		cflags = append(cflags, "--sysroot="+root+"/lib/wasi-libc/sysroot")
+	case "mingw-w64":
+		root := goenv.Get("TINYGOROOT")
+		path, _ := c.LibcPath("mingw-w64")
+		cflags = append(cflags,
+			"--sysroot="+path,
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
+			"-D_UCRT",
+		)
+	case "":
+		// No libc specified, nothing to add.
+	default:
+		// Incorrect configuration. This could be handled in a better way, but
+		// usually this will be found by developers (not by TinyGo users).
+		panic("unknown libc: " + c.Target.Libc)
 	}
-	cflags = append(cflags, c.LibcCFlags()...)
 	// Always emit debug information. It is optionally stripped at link time.
-	cflags = append(cflags, "-gdwarf-4")
+	cflags = append(cflags, "-g")
 	// Use the same optimization level as TinyGo.
 	cflags = append(cflags, "-O"+c.Options.Opt)
 	// Set the LLVM target triple.
@@ -346,77 +338,9 @@ func (c *Config) CFlags(libclang bool) []string {
 			cflags = append(cflags, "-mcpu="+c.Target.CPU)
 		}
 	}
-	// Set the -mabi flag, if needed.
-	if c.ABI() != "" {
-		cflags = append(cflags, "-mabi="+c.ABI())
-	}
 	return cflags
 }

-// LibcCFlags returns the C compiler flags for the configured libc.
-// It only uses flags that are part of the libc path (triple, cpu, abi, libc
-// name) so it can safely be used to compile another C library.
-func (c *Config) LibcCFlags() []string {
-	switch c.Target.Libc {
-	case "darwin-libSystem":
-		root := goenv.Get("TINYGOROOT")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(root, "lib/macos-minimal-sdk/src/usr/include"),
-		}
-	case "picolibc":
-		root := goenv.Get("TINYGOROOT")
-		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
-		path := c.LibraryPath("picolibc")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(picolibcDir, "include"),
-			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
-			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
-		}
-	case "musl":
-		root := goenv.Get("TINYGOROOT")
-		path := c.LibraryPath("musl")
-		arch := MuslArchitecture(c.Triple())
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", "generic"),
-			"-isystem", filepath.Join(root, "lib", "musl", "include"),
-		}
-	case "wasi-libc":
-		path := c.LibraryPath("wasi-libc")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-		}
-	case "wasmbuiltins":
-		// nothing to add (library is purely for builtins)
-		return nil
-	case "mingw-w64":
-		root := goenv.Get("TINYGOROOT")
-		path := c.LibraryPath("mingw-w64")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "include"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
-			"-D_UCRT",
-			"-D_WIN32_WINNT=0x0a00", // target Windows 10
-		}
-	case "":
-		// No libc specified, nothing to add.
-		return nil
-	default:
-		// Incorrect configuration. This could be handled in a better way, but
-		// usually this will be found by developers (not by TinyGo users).
-		panic("unknown libc: " + c.Target.Libc)
-	}
-}
-
 // LDFlags returns the flags to pass to the linker. A few more flags are needed
 // (like the one for the compiler runtime), but this represents the majority of
 // the flags.
@@ -431,8 +355,6 @@ func (c *Config) LDFlags() []string {
 	if c.Target.LinkerScript != "" {
 		ldflags = append(ldflags, "-T", c.Target.LinkerScript)
 	}
-	ldflags = append(ldflags, c.Options.ExtLDFlags...)
-
 	return ldflags
 }

@@ -455,8 +377,8 @@ func (c *Config) VerifyIR() bool {
 }

 // Debug returns whether debug (DWARF) information should be retained by the
-// linker. By default, debug information is retained, but it can be removed
-// with the -no-debug flag.
+// linker. By default, debug information is retained but it can be removed with
+// the -no-debug flag.
 func (c *Config) Debug() bool {
 	return c.Options.Debug
 }
@@ -500,7 +422,7 @@ func (c *Config) BinaryFormat(ext string) string {

 // Programmer returns the flash method and OpenOCD interface name given a
 // particular configuration. It may either be all configured in the target JSON
-// file or be modified using the -programmer command-line option.
+// file or be modified using the -programmmer command-line option.
 func (c *Config) Programmer() (method, openocdInterface string) {
 	switch c.Options.Programmer {
 	case "":
@@ -540,6 +462,9 @@ func (c *Config) OpenOCDConfiguration() (args []string, err error) {
 		return nil, fmt.Errorf("unknown OpenOCD transport: %#v", c.Target.OpenOCDTransport)
 	}
 	args = []string{"-f", "interface/" + openocdInterface + ".cfg"}
+	for _, cmd := range c.Target.OpenOCDCommands {
+		args = append(args, "-c", cmd)
+	}
 	if c.Target.OpenOCDTransport != "" {
 		transport := c.Target.OpenOCDTransport
 		if transport == "swd" {
@@ -551,9 +476,6 @@ func (c *Config) OpenOCDConfiguration() (args []string, err error) {
 		args = append(args, "-c", "transport select "+transport)
 	}
 	args = append(args, "-f", "target/"+c.Target.OpenOCDTarget+".cfg")
-	for _, cmd := range c.Target.OpenOCDCommands {
-		args = append(args, "-c", cmd)
-	}
 	return args, nil
 }

@@ -576,6 +498,15 @@ func (c *Config) RelocationModel() string {
 	return "static"
 }

+// WasmAbi returns the WASM ABI which is specified in the target JSON file, and
+// the value is overridden by `-wasm-abi` flag if it is provided
+func (c *Config) WasmAbi() string {
+	if c.Options.WasmAbi != "" {
+		return c.Options.WasmAbi
+	}
+	return c.Target.WasmAbi
+}
+
 // EmulatorName is a shorthand to get the command for this emulator, something
 // like qemu-system-arm or simavr.
 func (c *Config) EmulatorName() string {
@@ -609,8 +540,6 @@ func (c *Config) Emulator(format, binary string) ([]string, error) {
 	var emulator []string
 	for _, s := range parts {
 		s = strings.ReplaceAll(s, "{root}", goenv.Get("TINYGOROOT"))
-		// Allow replacement of what's usually /tmp except notably Windows.
-		s = strings.ReplaceAll(s, "{tmpDir}", os.TempDir())
 		s = strings.ReplaceAll(s, "{"+format+"}", binary)
 		emulator = append(emulator, s)
 	}
@@ -619,14 +548,5 @@ func (c *Config) Emulator(format, binary string) ([]string, error) {

 type TestConfig struct {
 	CompileTestBinary bool
-	CompileOnly       bool
-	Verbose           bool
-	Short             bool
-	RunRegexp         string
-	SkipRegexp        string
-	Count             *int
-	BenchRegexp       string
-	BenchTime         string
-	BenchMem          bool
-	Shuffle           string
+	// TODO: Filter the test functions to run, include verbose flag, etc
 }
@@ -8,11 +8,10 @@ import (
 )

 var (
-	validBuildModeOptions     = []string{"default", "c-shared", "wasi-legacy"}
-	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise", "boehm"}
-	validSchedulerOptions     = []string{"none", "tasks", "asyncify", "threads"}
-	validSerialOptions        = []string{"none", "uart", "usb", "rtt"}
-	validPrintSizeOptions     = []string{"none", "short", "full", "html"}
+	validGCOptions            = []string{"none", "leaking", "conservative"}
+	validSchedulerOptions     = []string{"none", "tasks", "asyncify"}
+	validSerialOptions        = []string{"none", "uart", "usb"}
+	validPrintSizeOptions     = []string{"none", "short", "full"}
 	validPanicStrategyOptions = []string{"print", "trap"}
 	validOptOptions           = []string{"none", "0", "1", "2", "s", "z"}
 )
@@ -24,10 +23,7 @@ type Options struct {
 	GOOS            string // environment variable
 	GOARCH          string // environment variable
 	GOARM           string // environment variable (only used with GOARCH=arm)
-	GOMIPS          string // environment variable (only used with GOARCH=mips and GOARCH=mipsle)
-	Directory       string // working dir, leave it unset to use the current working dir
 	Target          string
-	BuildMode       string // -buildmode flag
 	Opt             string
 	GC              string
 	PanicStrategy   string
@@ -39,39 +35,27 @@ type Options struct {
 	PrintIR         bool
 	DumpSSA         bool
 	VerifyIR        bool
-	SkipDWARF       bool
 	PrintCommands   func(cmd string, args ...string) `json:"-"`
 	Semaphore       chan struct{}                    `json:"-"` // -p flag controls cap
 	Debug           bool
-	Nobounds        bool
 	PrintSizes      string
 	PrintAllocs     *regexp.Regexp // regexp string
 	PrintStacks     bool
 	Tags            []string
+	WasmAbi         string
 	GlobalValues    map[string]map[string]string // map[pkgpath]map[varname]value
 	TestConfig      TestConfig
 	Programmer      string
 	OpenOCDCommands []string
 	LLVMFeatures    string
+	Directory       string
 	PrintJSON       bool
 	Monitor         bool
 	BaudRate        int
-	Timeout         time.Duration
-	WITPackage      string // pass through to wasm-tools component embed invocation
-	WITWorld        string // pass through to wasm-tools component embed -w option
-	ExtLDFlags      []string
 }

 // Verify performs a validation on the given options, raising an error if options are not valid.
 func (o *Options) Verify() error {
-	if o.BuildMode != "" {
-		valid := isInArray(validBuildModeOptions, o.BuildMode)
-		if !valid {
-			return fmt.Errorf(`invalid buildmode option '%s': valid values are %s`,
-				o.BuildMode,
-				strings.Join(validBuildModeOptions, ", "))
-		}
-	}
 	if o.GC != "" {
 		valid := isInArray(validGCOptions, o.GC)
 		if !valid {
@@ -9,9 +9,9 @@ import (

 func TestVerifyOptions(t *testing.T) {

-	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative, custom, precise, boehm`)
-	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify, threads`)
-	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full, html`)
+	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative`)
+	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify`)
+	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full`)
 	expectedPanicStrategyError := errors.New(`invalid panic option 'incorrect': valid values are print, trap`)

 	testCases := []struct {
@@ -48,12 +48,6 @@ func TestVerifyOptions(t *testing.T) {
 				GC: "conservative",
 			},
 		},
-		{
-			name: "GCOptionCustom",
-			opts: compileopts.Options{
-				GC: "custom",
-			},
-		},
 		{
 			name: "InvalidSchedulerOption",
 			opts: compileopts.Options{
@@ -23,50 +23,45 @@ import (
 // https://doc.rust-lang.org/nightly/nightly-rustc/rustc_target/spec/struct.TargetOptions.html
 // https://github.com/shepmaster/rust-arduino-blink-led-no-core-with-cargo/blob/master/blink/arduino.json
 type TargetSpec struct {
-	Inherits         []string `json:"inherits,omitempty"`
-	Triple           string   `json:"llvm-target,omitempty"`
-	CPU              string   `json:"cpu,omitempty"`
-	ABI              string   `json:"target-abi,omitempty"` // roughly equivalent to -mabi= flag
-	Features         string   `json:"features,omitempty"`
-	GOOS             string   `json:"goos,omitempty"`
-	GOARCH           string   `json:"goarch,omitempty"`
-	SoftFloat        bool     // used for non-baremetal systems (GOMIPS=softfloat etc)
-	BuildTags        []string `json:"build-tags,omitempty"`
-	BuildMode        string   `json:"buildmode,omitempty"` // default build mode (if nothing specified)
-	GC               string   `json:"gc,omitempty"`
-	Scheduler        string   `json:"scheduler,omitempty"`
-	Serial           string   `json:"serial,omitempty"` // which serial output to use (uart, usb, none)
-	Linker           string   `json:"linker,omitempty"`
-	RTLib            string   `json:"rtlib,omitempty"` // compiler runtime library (libgcc, compiler-rt)
-	Libc             string   `json:"libc,omitempty"`
-	AutoStackSize    *bool    `json:"automatic-stack-size,omitempty"` // Determine stack size automatically at compile time.
-	DefaultStackSize uint64   `json:"default-stack-size,omitempty"`   // Default stack size if the size couldn't be determined at compile time.
-	CFlags           []string `json:"cflags,omitempty"`
-	LDFlags          []string `json:"ldflags,omitempty"`
-	LinkerScript     string   `json:"linkerscript,omitempty"`
-	ExtraFiles       []string `json:"extra-files,omitempty"`
-	RP2040BootPatch  *bool    `json:"rp2040-boot-patch,omitempty"` // Patch RP2040 2nd stage bootloader checksum
-	BootPatches      []string `json:"boot-patches,omitempty"`      // Bootloader patches to be applied in the order they appear.
-	Emulator         string   `json:"emulator,omitempty"`
-	FlashCommand     string   `json:"flash-command,omitempty"`
-	GDB              []string `json:"gdb,omitempty"`
-	PortReset        string   `json:"flash-1200-bps-reset,omitempty"`
-	SerialPort       []string `json:"serial-port,omitempty"` // serial port IDs in the form "vid:pid"
-	FlashMethod      string   `json:"flash-method,omitempty"`
-	FlashVolume      []string `json:"msd-volume-name,omitempty"`
-	FlashFilename    string   `json:"msd-firmware-name,omitempty"`
-	UF2FamilyID      string   `json:"uf2-family-id,omitempty"`
-	BinaryFormat     string   `json:"binary-format,omitempty"`
-	OpenOCDInterface string   `json:"openocd-interface,omitempty"`
-	OpenOCDTarget    string   `json:"openocd-target,omitempty"`
-	OpenOCDTransport string   `json:"openocd-transport,omitempty"`
-	OpenOCDCommands  []string `json:"openocd-commands,omitempty"`
-	OpenOCDVerify    *bool    `json:"openocd-verify,omitempty"` // enable verify when flashing with openocd
-	JLinkDevice      string   `json:"jlink-device,omitempty"`
-	CodeModel        string   `json:"code-model,omitempty"`
-	RelocationModel  string   `json:"relocation-model,omitempty"`
-	WITPackage       string   `json:"wit-package,omitempty"`
-	WITWorld         string   `json:"wit-world,omitempty"`
+	Inherits         []string `json:"inherits"`
+	Triple           string   `json:"llvm-target"`
+	CPU              string   `json:"cpu"`
+	Features         string   `json:"features"`
+	GOOS             string   `json:"goos"`
+	GOARCH           string   `json:"goarch"`
+	BuildTags        []string `json:"build-tags"`
+	GC               string   `json:"gc"`
+	Scheduler        string   `json:"scheduler"`
+	Serial           string   `json:"serial"` // which serial output to use (uart, usb, none)
+	Linker           string   `json:"linker"`
+	RTLib            string   `json:"rtlib"` // compiler runtime library (libgcc, compiler-rt)
+	Libc             string   `json:"libc"`
+	AutoStackSize    *bool    `json:"automatic-stack-size"` // Determine stack size automatically at compile time.
+	DefaultStackSize uint64   `json:"default-stack-size"`   // Default stack size if the size couldn't be determined at compile time.
+	CFlags           []string `json:"cflags"`
+	LDFlags          []string `json:"ldflags"`
+	LinkerScript     string   `json:"linkerscript"`
+	ExtraFiles       []string `json:"extra-files"`
+	RP2040BootPatch  *bool    `json:"rp2040-boot-patch"` // Patch RP2040 2nd stage bootloader checksum
+	Emulator         string   `json:"emulator"`
+	FlashCommand     string   `json:"flash-command"`
+	GDB              []string `json:"gdb"`
+	PortReset        string   `json:"flash-1200-bps-reset"`
+	SerialPort       []string `json:"serial-port"` // serial port IDs in the form "acm:vid:pid" or "usb:vid:pid"
+	FlashMethod      string   `json:"flash-method"`
+	FlashVolume      string   `json:"msd-volume-name"`
+	FlashFilename    string   `json:"msd-firmware-name"`
+	UF2FamilyID      string   `json:"uf2-family-id"`
+	BinaryFormat     string   `json:"binary-format"`
+	OpenOCDInterface string   `json:"openocd-interface"`
+	OpenOCDTarget    string   `json:"openocd-target"`
+	OpenOCDTransport string   `json:"openocd-transport"`
+	OpenOCDCommands  []string `json:"openocd-commands"`
+	OpenOCDVerify    *bool    `json:"openocd-verify"` // enable verify when flashing with openocd
+	JLinkDevice      string   `json:"jlink-device"`
+	CodeModel        string   `json:"code-model"`
+	RelocationModel  string   `json:"relocation-model"`
+	WasmAbi          string   `json:"wasm-abi"`
 }

 // overrideProperties overrides all properties that are set in child into itself using reflection.
@@ -89,10 +84,6 @@ func (spec *TargetSpec) overrideProperties(child *TargetSpec) error {
 			if src.Uint() != 0 {
 				dst.Set(src)
 			}
-		case reflect.Bool:
-			if src.Bool() {
-				dst.Set(src)
-			}
 		case reflect.Ptr: // for pointers, copy if not nil
 			if !src.IsNil() {
 				dst.Set(src)
@@ -178,23 +169,52 @@ func (spec *TargetSpec) resolveInherits() error {

 // Load a target specification.
 func LoadTarget(options *Options) (*TargetSpec, error) {
-	if options.Target == "" && options.GOARCH == "wasm" {
-		// Set a specific target if we're building from a known GOOS/GOARCH
-		// combination that is defined in a target JSON file.
-		switch options.GOOS {
-		case "js":
-			options.Target = "wasm"
-		case "wasip1":
-			options.Target = "wasip1"
-		case "wasip2":
-			options.Target = "wasip2"
-		default:
-			return nil, errors.New("GOARCH=wasm but GOOS is not set correctly. Please set GOOS to wasm, wasip1, or wasip2.")
-		}
-	}
-
 	if options.Target == "" {
-		return defaultTarget(options)
+		// Configure based on GOOS/GOARCH environment variables (falling back to
+		// runtime.GOOS/runtime.GOARCH), and generate a LLVM target based on it.
+		var llvmarch string
+		switch options.GOARCH {
+		case "386":
+			llvmarch = "i386"
+		case "amd64":
+			llvmarch = "x86_64"
+		case "arm64":
+			llvmarch = "aarch64"
+		case "arm":
+			switch options.GOARM {
+			case "5":
+				llvmarch = "armv5"
+			case "6":
+				llvmarch = "armv6"
+			case "7":
+				llvmarch = "armv7"
+			default:
+				return nil, fmt.Errorf("invalid GOARM=%s, must be 5, 6, or 7", options.GOARM)
+			}
+		default:
+			llvmarch = options.GOARCH
+		}
+		llvmos := options.GOOS
+		if llvmos == "darwin" {
+			// Use macosx* instead of darwin, otherwise darwin/arm64 will refer
+			// to iOS!
+			llvmos = "macosx10.12.0"
+			if llvmarch == "aarch64" {
+				// Looks like Apple prefers to call this architecture ARM64
+				// instead of AArch64.
+				llvmarch = "arm64"
+			}
+		}
+		// Target triples (which actually have four components, but are called
+		// triples for historical reasons) have the form:
+		//   arch-vendor-os-environment
+		target := llvmarch + "-unknown-" + llvmos
+		if options.GOOS == "windows" {
+			target += "-gnu"
+		} else if options.GOARCH == "arm" {
+			target += "-gnueabihf"
+		}
+		return defaultTarget(options.GOOS, options.GOARCH, target)
 	}

 	// See whether there is a target specification for this target (e.g.
@@ -218,219 +238,59 @@ func LoadTarget(options *Options) (*TargetSpec, error) {
 	return spec, nil
 }

-// GetTargetSpecs retrieves target specifications from the TINYGOROOT targets
-// directory.  Only valid target JSON files are considered, and the function
-// returns a map of target names to their respective TargetSpec.
-func GetTargetSpecs() (map[string]*TargetSpec, error) {
-	dir := filepath.Join(goenv.Get("TINYGOROOT"), "targets")
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return nil, fmt.Errorf("could not list targets: %w", err)
-	}
-
-	maps := map[string]*TargetSpec{}
-	for _, entry := range entries {
-		entryInfo, err := entry.Info()
-		if err != nil {
-			return nil, fmt.Errorf("could not get entry info: %w", err)
-		}
-		if !entryInfo.Mode().IsRegular() || !strings.HasSuffix(entry.Name(), ".json") {
-			// Only inspect JSON files.
-			continue
-		}
-		path := filepath.Join(dir, entry.Name())
-		spec, err := LoadTarget(&Options{Target: path})
-		if err != nil {
-			return nil, fmt.Errorf("could not list target: %w", err)
-		}
-		if spec.FlashMethod == "" && spec.FlashCommand == "" && spec.Emulator == "" {
-			// This doesn't look like a regular target file, but rather like
-			// a parent target (such as targets/cortex-m.json).
-			continue
-		}
-		name := entry.Name()
-		name = name[:len(name)-5]
-		maps[name] = spec
-	}
-	return maps, nil
-}
-
-// Load a target from environment variables (which default to
-// runtime.GOOS/runtime.GOARCH).
-func defaultTarget(options *Options) (*TargetSpec, error) {
+func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
+	// No target spec available. Use the default one, useful on most systems
+	// with a regular OS.
 	spec := TargetSpec{
-		GOOS:             options.GOOS,
-		GOARCH:           options.GOARCH,
-		BuildTags:        []string{options.GOOS, options.GOARCH},
+		Triple:           triple,
+		GOOS:             goos,
+		GOARCH:           goarch,
+		BuildTags:        []string{goos, goarch},
+		Scheduler:        "tasks",
 		Linker:           "cc",
 		DefaultStackSize: 1024 * 64, // 64kB
 		GDB:              []string{"gdb"},
 		PortReset:        "false",
 	}
-
-	// Configure target based on GOARCH.
-	var llvmarch string
-	switch options.GOARCH {
+	switch goarch {
 	case "386":
-		llvmarch = "i386"
 		spec.CPU = "pentium4"
-		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "amd64":
-		llvmarch = "x86_64"
 		spec.CPU = "x86-64"
-		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "arm":
 		spec.CPU = "generic"
 		spec.CFlags = append(spec.CFlags, "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
-		subarch := strings.Split(options.GOARM, ",")
-		if len(subarch) > 2 {
-			return nil, fmt.Errorf("invalid GOARM=%s, must be of form <num>,[hardfloat|softfloat]", options.GOARM)
-		}
-		archLevel := subarch[0]
-		var fpu string
-		if len(subarch) >= 2 {
-			fpu = subarch[1]
-		} else {
-			// Pick the default fpu value: softfloat for armv5 and hardfloat
-			// above that.
-			if archLevel == "5" {
-				fpu = "softfloat"
-			} else {
-				fpu = "hardfloat"
-			}
-		}
-		switch fpu {
-		case "softfloat":
-			spec.CFlags = append(spec.CFlags, "-msoft-float")
-			spec.SoftFloat = true
-		case "hardfloat":
-			// Hardware floating point support is the default everywhere except
-			// on ARMv5 where it needs to be enabled explicitly.
-			if archLevel == "5" {
-				spec.CFlags = append(spec.CFlags, "-mfpu=vfpv2")
-			}
-		default:
-			return nil, fmt.Errorf("invalid extension GOARM=%s, must be softfloat or hardfloat", options.GOARM)
-		}
-		switch archLevel {
-		case "5":
-			llvmarch = "armv5"
-			if spec.SoftFloat {
-				spec.Features = "+armv5t,+soft-float,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv5t,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		case "6":
-			llvmarch = "armv6"
-			if spec.SoftFloat {
-				spec.Features = "+armv6,+dsp,+soft-float,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv6,+dsp,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		case "7":
-			llvmarch = "armv7"
-			if spec.SoftFloat {
-				spec.Features = "+armv7-a,+dsp,+soft-float,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv7-a,+d32,+dsp,+fp64,+neon,+vfp2,+vfp2sp,+vfp3,+vfp3d16,+vfp3d16sp,+vfp3sp,-aes,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-sha2,-thumb-mode,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		default:
-			return nil, fmt.Errorf("invalid GOARM=%s, must be of form <num>,[hardfloat|softfloat] where num is 5, 6, or 7", options.GOARM)
+		switch strings.Split(triple, "-")[0] {
+		case "armv5":
+			spec.Features = "+armv5t,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
+		case "armv6":
+			spec.Features = "+armv6,+dsp,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
+		case "armv7":
+			spec.Features = "+armv7-a,+d32,+dsp,+fp64,+neon,+vfp2,+vfp2sp,+vfp3,+vfp3d16,+vfp3d16sp,+vfp3sp,-aes,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-sha2,-thumb-mode,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
 		}
 	case "arm64":
 		spec.CPU = "generic"
-		llvmarch = "aarch64"
-		if options.GOOS == "darwin" {
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a"
-			// Looks like Apple prefers to call this architecture ARM64
-			// instead of AArch64.
-			llvmarch = "arm64"
-		} else if options.GOOS == "windows" {
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a,-fmv"
-		} else { // linux
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a,-fmv,-outline-atomics"
-		}
-	case "mips", "mipsle":
-		spec.CPU = "mips32"
-		spec.CFlags = append(spec.CFlags, "-fno-pic")
-		if options.GOARCH == "mips" {
-			llvmarch = "mips" // big endian
-		} else {
-			llvmarch = "mipsel" // little endian
-		}
-		switch options.GOMIPS {
-		case "hardfloat":
-			spec.Features = "+fpxx,+mips32,+nooddspreg,-noabicalls"
-		case "softfloat":
-			spec.SoftFloat = true
-			spec.Features = "+mips32,+soft-float,-noabicalls"
-			spec.CFlags = append(spec.CFlags, "-msoft-float")
-		default:
-			return nil, fmt.Errorf("invalid GOMIPS=%s: must be hardfloat or softfloat", options.GOMIPS)
-		}
-	case "wasm":
-		return nil, fmt.Errorf("GOARCH=wasm but GOOS is unset. Please set GOOS to wasm, wasip1, or wasip2.")
-	default:
-		return nil, fmt.Errorf("unknown GOARCH=%s", options.GOARCH)
+		spec.Features = "+neon"
 	}
-
-	// Configure target based on GOOS.
-	llvmos := options.GOOS
-	llvmvendor := "unknown"
-	switch options.GOOS {
-	case "darwin":
-		spec.GC = "boehm"
-		platformVersion := "10.12.0"
-		if options.GOARCH == "arm64" {
-			platformVersion = "11.0.0" // first macosx platform with arm64 support
-		}
-		llvmvendor = "apple"
-		spec.Scheduler = "tasks"
+	if goos == "darwin" {
 		spec.Linker = "ld.lld"
 		spec.Libc = "darwin-libSystem"
-		// Use macosx* instead of darwin, otherwise darwin/arm64 will refer to
-		// iOS!
-		llvmos = "macosx" + platformVersion
+		arch := strings.Split(triple, "-")[0]
+		platformVersion := strings.TrimPrefix(strings.Split(triple, "-")[2], "macosx")
 		spec.LDFlags = append(spec.LDFlags,
 			"-flavor", "darwin",
 			"-dead_strip",
-			"-arch", llvmarch,
+			"-arch", arch,
 			"-platform_version", "macos", platformVersion, platformVersion,
 		)
-		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/internal/futex/futex_darwin.c",
-			"src/runtime/os_darwin.c",
-			"src/runtime/runtime_unix.c",
-			"src/runtime/signal.c")
-	case "linux":
-		spec.GC = "boehm"
-		spec.Scheduler = "threads"
+	} else if goos == "linux" {
 		spec.Linker = "ld.lld"
 		spec.RTLib = "compiler-rt"
 		spec.Libc = "musl"
 		spec.LDFlags = append(spec.LDFlags, "--gc-sections")
-		if options.GOARCH == "arm64" {
-			// Disable outline atomics. For details, see:
-			// https://cpufun.substack.com/p/atomics-in-aarch64
-			// A better way would be to fully support outline atomics, which
-			// makes atomics slightly more efficient on systems with many cores.
-			// But the instructions are only supported on newer aarch64 CPUs, so
-			// this feature is normally put in a system library which does
-			// feature detection for you.
-			// We take the lazy way out and simply disable this feature, instead
-			// of enabling it in compiler-rt (which is a bit more complicated).
-			// We don't really need this feature anyway as we don't even support
-			// proper threading.
-			spec.CFlags = append(spec.CFlags, "-mno-outline-atomics")
-		}
-		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/internal/futex/futex_linux.c",
-			"src/internal/task/task_threads.c",
-			"src/runtime/runtime_unix.c",
-			"src/runtime/signal.c")
-	case "windows":
-		spec.GC = "boehm"
-		spec.Scheduler = "tasks"
+	} else if goos == "windows" {
 		spec.Linker = "ld.lld"
 		spec.Libc = "mingw-w64"
 		// Note: using a medium code model, low image base and no ASLR
@@ -439,68 +299,32 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 		// normally present in Go (without explicitly opting in).
 		// For more discussion:
 		// https://groups.google.com/g/Golang-nuts/c/Jd9tlNc6jUE/m/Zo-7zIP_m3MJ?pli=1
-		switch options.GOARCH {
-		case "amd64":
-			spec.LDFlags = append(spec.LDFlags,
-				"-m", "i386pep",
-				"--image-base", "0x400000",
-			)
-		case "arm64":
-			spec.LDFlags = append(spec.LDFlags,
-				"-m", "arm64pe",
-			)
-		}
 		spec.LDFlags = append(spec.LDFlags,
+			"-m", "i386pep",
 			"-Bdynamic",
+			"--image-base", "0x400000",
 			"--gc-sections",
 			"--no-insert-timestamp",
 			"--no-dynamicbase",
 		)
-	case "wasm", "wasip1", "wasip2":
-		return nil, fmt.Errorf("GOOS=%s but GOARCH is unset. Please set GOARCH to wasm", options.GOOS)
-	default:
-		return nil, fmt.Errorf("unknown GOOS=%s", options.GOOS)
+	} else {
+		spec.LDFlags = append(spec.LDFlags, "-no-pie", "-Wl,--gc-sections") // WARNING: clang < 5.0 requires -nopie
 	}
-
-	// Target triples (which actually have four components, but are called
-	// triples for historical reasons) have the form:
-	//   arch-vendor-os-environment
-	spec.Triple = llvmarch + "-" + llvmvendor + "-" + llvmos
-	if options.GOOS == "windows" {
-		spec.Triple += "-gnu"
-	} else if options.GOOS == "linux" {
-		// We use musl on Linux (not glibc) so we should use -musleabi* instead
-		// of -gnueabi*.
-		// The *hf suffix selects between soft/hard floating point ABI.
-		if spec.SoftFloat {
-			spec.Triple += "-musleabi"
-		} else {
-			spec.Triple += "-musleabihf"
-		}
-	}
-
-	// Add extra assembly files (needed for the scheduler etc).
-	if options.GOARCH != "wasm" {
+	if goarch != "wasm" {
 		suffix := ""
-		if options.GOOS == "windows" && options.GOARCH == "amd64" {
-			// Windows uses a different calling convention on amd64 from other
-			// operating systems so we need separate assembly files.
+		if goos == "windows" {
+			// Windows uses a different calling convention from other operating
+			// systems so we need separate assembly files.
 			suffix = "_windows"
 		}
-		asmGoarch := options.GOARCH
-		if options.GOARCH == "mips" || options.GOARCH == "mipsle" {
-			asmGoarch = "mipsx"
-		}
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/asm_"+asmGoarch+suffix+".S")
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_stack_"+asmGoarch+suffix+".S")
+		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/asm_"+goarch+suffix+".S")
+		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_stack_"+goarch+suffix+".S")
 	}
-
-	// Configure the emulator.
-	if options.GOARCH != runtime.GOARCH {
+	if goarch != runtime.GOARCH {
 		// Some educated guesses as to how to invoke helper programs.
 		spec.GDB = []string{"gdb-multiarch"}
-		if options.GOOS == "linux" {
-			switch options.GOARCH {
+		if goos == "linux" {
+			switch goarch {
 			case "386":
 				// amd64 can _usually_ run 32-bit programs, so skip the emulator in that case.
 				if runtime.GOARCH != "amd64" {
@@ -512,19 +336,14 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 				spec.Emulator = "qemu-arm {}"
 			case "arm64":
 				spec.Emulator = "qemu-aarch64 {}"
-			case "mips":
-				spec.Emulator = "qemu-mips {}"
-			case "mipsle":
-				spec.Emulator = "qemu-mipsel {}"
 			}
 		}
 	}
-	if options.GOOS != runtime.GOOS {
-		if options.GOOS == "windows" {
+	if goos != runtime.GOOS {
+		if goos == "windows" {
 			spec.Emulator = "wine {}"
 		}
 	}
-
 	return &spec, nil
 }

@@ -16,18 +16,13 @@ import "tinygo.org/x/go-llvm"

 var stdlibAliases = map[string]string{
 	// crypto packages
-	"crypto/ed25519/internal/edwards25519/field.feMul": "crypto/ed25519/internal/edwards25519/field.feMulGeneric",
-	"crypto/internal/edwards25519/field.feSquare":      "crypto/ed25519/internal/edwards25519/field.feSquareGeneric",
-	"crypto/md5.block":           "crypto/md5.blockGeneric",
-	"crypto/sha1.block":          "crypto/sha1.blockGeneric",
-	"crypto/sha1.blockAMD64":     "crypto/sha1.blockGeneric",
-	"crypto/sha256.block":        "crypto/sha256.blockGeneric",
-	"crypto/sha512.blockAMD64":   "crypto/sha512.blockGeneric",
-	"internal/chacha8rand.block": "internal/chacha8rand.block_generic",
-
-	// AES
-	"crypto/aes.decryptBlockAsm": "crypto/aes.decryptBlock",
-	"crypto/aes.encryptBlockAsm": "crypto/aes.encryptBlock",
+	"crypto/ed25519/internal/edwards25519/field.feMul":    "crypto/ed25519/internal/edwards25519/field.feMulGeneric",
+	"crypto/ed25519/internal/edwards25519/field.feSquare": "crypto/ed25519/internal/edwards25519/field.feSquareGeneric",
+	"crypto/md5.block":         "crypto/md5.blockGeneric",
+	"crypto/sha1.block":        "crypto/sha1.blockGeneric",
+	"crypto/sha1.blockAMD64":   "crypto/sha1.blockGeneric",
+	"crypto/sha256.block":      "crypto/sha256.blockGeneric",
+	"crypto/sha512.blockAMD64": "crypto/sha512.blockGeneric",

 	// math package
 	"math.archHypot": "math.hypot",
@@ -57,7 +52,7 @@ func (b *builder) createAlias(alias llvm.Value) {
 		b.CreateUnreachable()
 		return
 	}
-	result := b.CreateCall(alias.GlobalValueType(), alias, b.llvmFn.Params(), "")
+	result := b.CreateCall(alias, b.llvmFn.Params(), "")
 	if result.Type().TypeKind() == llvm.VoidTypeKind {
 		b.CreateRetVoid()
 	} else {
@@ -89,24 +89,23 @@ func (b *builder) createSliceToArrayPointerCheck(sliceLen llvm.Value, arrayLen i
 	b.createRuntimeAssert(isLess, "slicetoarray", "sliceToArrayPointerPanic")
 }

-// createUnsafeSliceStringCheck inserts a runtime check used for unsafe.Slice
-// and unsafe.String. This function must panic if the ptr/len parameters are
-// invalid.
-func (b *builder) createUnsafeSliceStringCheck(name string, ptr, len llvm.Value, elementType llvm.Type, lenType *types.Basic) {
-	// From the documentation of unsafe.Slice and unsafe.String:
+// createUnsafeSliceCheck inserts a runtime check used for unsafe.Slice. This
+// function must panic if the ptr/len parameters are invalid.
+func (b *builder) createUnsafeSliceCheck(ptr, len llvm.Value, lenType *types.Basic) {
+	// From the documentation of unsafe.Slice:
 	//   > At run time, if len is negative, or if ptr is nil and len is not
 	//   > zero, a run-time panic occurs.
 	// However, in practice, it is also necessary to check that the length is
 	// not too big that a GEP wouldn't be possible without wrapping the pointer.
 	// These two checks (non-negative and not too big) can be merged into one
-	// using an unsigned greater than.
+	// using an unsiged greater than.

 	// Make sure the len value is at least as big as a uintptr.
 	len = b.extendInteger(len, lenType, b.uintptrType)

 	// Determine the maximum slice size, and therefore the maximum value of the
 	// len parameter.
-	maxSize := b.maxSliceSize(elementType)
+	maxSize := b.maxSliceSize(ptr.Type().ElementType())
 	maxSizeValue := llvm.ConstInt(len.Type(), maxSize, false)

 	// Do the check. By using unsigned greater than for the length check, signed
@@ -118,7 +117,7 @@ func (b *builder) createUnsafeSliceStringCheck(name string, ptr, len llvm.Value,
 	lenIsNotZero := b.CreateICmp(llvm.IntNE, len, zero, "")
 	assert := b.CreateAnd(ptrIsNil, lenIsNotZero, "")
 	assert = b.CreateOr(assert, lenOutOfBounds, "")
-	b.createRuntimeAssert(assert, name, "unsafeSlicePanic")
+	b.createRuntimeAssert(assert, "unsafe.Slice", "unsafeSlicePanic")
 }

 // createChanBoundsCheck creates a bounds check before creating a new channel to
@@ -135,7 +134,7 @@ func (b *builder) createChanBoundsCheck(elementSize uint64, bufSize llvm.Value,

 	// Calculate (^uintptr(0)) >> 1, which is the max value that fits in an
 	// uintptr if uintptrs were signed.
-	maxBufSize := b.CreateLShr(llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)), llvm.ConstInt(b.uintptrType, 1, false), "")
+	maxBufSize := llvm.ConstLShr(llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)), llvm.ConstInt(b.uintptrType, 1, false))
 	if elementSize > maxBufSize.ZExtValue() {
 		b.addError(pos, fmt.Sprintf("channel element type is too big (%v bytes)", elementSize))
 		return
@@ -146,11 +145,11 @@ func (b *builder) createChanBoundsCheck(elementSize uint64, bufSize llvm.Value,
 	}
 	// Make the maxBufSize actually the maximum allowed value (in number of
 	// elements in the channel buffer).
-	maxBufSize = b.CreateUDiv(maxBufSize, llvm.ConstInt(b.uintptrType, elementSize, false), "")
+	maxBufSize = llvm.ConstUDiv(maxBufSize, llvm.ConstInt(b.uintptrType, elementSize, false))

 	// Make sure maxBufSize has the same type as bufSize.
 	if maxBufSize.Type() != bufSize.Type() {
-		maxBufSize = b.CreateZExt(maxBufSize, bufSize.Type(), "")
+		maxBufSize = llvm.ConstZExt(maxBufSize, bufSize.Type())
 	}

 	// Do the check for a too large (or negative) buffer size.
@@ -1,6 +1,9 @@
 package compiler

 import (
+	"fmt"
+	"strings"
+
 	"tinygo.org/x/go-llvm"
 )

@@ -10,42 +13,74 @@ import (
 func (b *builder) createAtomicOp(name string) llvm.Value {
 	switch name {
 	case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		if strings.HasPrefix(b.Triple, "avr") {
+			// AtomicRMW does not work on AVR as intended:
+			// - There are some register allocation issues (fixed by https://reviews.llvm.org/D97127 which is not yet in a usable LLVM release)
+			// - The result is the new value instead of the old value
+			vType := val.Type()
+			name := fmt.Sprintf("__sync_fetch_and_add_%d", vType.IntTypeWidth()/8)
+			fn := b.mod.NamedFunction(name)
+			if fn.IsNil() {
+				fn = llvm.AddFunction(b.mod, name, llvm.FunctionType(vType, []llvm.Type{ptr.Type(), vType}, false))
+			}
+			oldVal := b.createCall(fn, []llvm.Value{ptr, val}, "")
+			// Return the new value, not the original value returned.
+			return b.CreateAdd(oldVal, val, "")
+		}
 		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAdd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
 		// Return the new value, not the original value returned by atomicrmw.
 		return b.CreateAdd(oldVal, val, "")
-	case "AndInt32", "AndInt64", "AndUint32", "AndUint64", "AndUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
-		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAnd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
-		return oldVal
-	case "OrInt32", "OrInt64", "OrUint32", "OrUint64", "OrUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
-		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpOr, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
-		return oldVal
 	case "SwapInt32", "SwapInt64", "SwapUint32", "SwapUint64", "SwapUintptr", "SwapPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		isPointer := val.Type().TypeKind() == llvm.PointerTypeKind
+		if isPointer {
+			// atomicrmw only supports integers, so cast to an integer.
+			// TODO: this is fixed in LLVM 15.
+			val = b.CreatePtrToInt(val, b.uintptrType, "")
+			ptr = b.CreateBitCast(ptr, llvm.PointerType(val.Type(), 0), "")
+		}
 		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpXchg, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
+		if isPointer {
+			oldVal = b.CreateIntToPtr(oldVal, b.i8ptrType, "")
+		}
 		return oldVal
 	case "CompareAndSwapInt32", "CompareAndSwapInt64", "CompareAndSwapUint32", "CompareAndSwapUint64", "CompareAndSwapUintptr", "CompareAndSwapPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		old := b.getValue(b.fn.Params[1], getPos(b.fn))
-		newVal := b.getValue(b.fn.Params[2], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		old := b.getValue(b.fn.Params[1])
+		newVal := b.getValue(b.fn.Params[2])
 		tuple := b.CreateAtomicCmpXchg(ptr, old, newVal, llvm.AtomicOrderingSequentiallyConsistent, llvm.AtomicOrderingSequentiallyConsistent, true)
 		swapped := b.CreateExtractValue(tuple, 1, "")
 		return swapped
 	case "LoadInt32", "LoadInt64", "LoadUint32", "LoadUint64", "LoadUintptr", "LoadPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.CreateLoad(b.getLLVMType(b.fn.Signature.Results().At(0).Type()), ptr, "")
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.CreateLoad(ptr, "")
 		val.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
 		val.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
 		return val
 	case "StoreInt32", "StoreInt64", "StoreUint32", "StoreUint64", "StoreUintptr", "StorePointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		if strings.HasPrefix(b.Triple, "avr") {
+			// SelectionDAGBuilder is currently missing the "are unaligned atomics allowed" check for stores.
+			vType := val.Type()
+			isPointer := vType.TypeKind() == llvm.PointerTypeKind
+			if isPointer {
+				// libcalls only supports integers, so cast to an integer.
+				vType = b.uintptrType
+				val = b.CreatePtrToInt(val, vType, "")
+				ptr = b.CreateBitCast(ptr, llvm.PointerType(vType, 0), "")
+			}
+			name := fmt.Sprintf("__atomic_store_%d", vType.IntTypeWidth()/8)
+			fn := b.mod.NamedFunction(name)
+			if fn.IsNil() {
+				fn = llvm.AddFunction(b.mod, name, llvm.FunctionType(vType, []llvm.Type{ptr.Type(), vType, b.uintptrType}, false))
+			}
+			b.createCall(fn, []llvm.Value{ptr, val, llvm.ConstInt(b.uintptrType, 5, false)}, "")
+			return llvm.Value{}
+		}
 		store := b.CreateStore(val, ptr)
 		store.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
 		store.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
@@ -19,9 +19,8 @@ const maxFieldsPerParam = 3
 // useful while declaring or defining a function.
 type paramInfo struct {
 	llvmType llvm.Type
-	name     string     // name, possibly with suffixes for e.g. struct fields
-	elemSize uint64     // size of pointer element type, or 0 if this isn't a pointer
-	flags    paramFlags // extra flags for this parameter
+	name     string // name, possibly with suffixes for e.g. struct fields
+	flags    paramFlags
 }

 // paramFlags identifies parameter attributes for flags. Most importantly, it
@@ -29,28 +28,24 @@ type paramInfo struct {
 type paramFlags uint8

 const (
-	// Whether this is a full or partial Go parameter (int, slice, etc).
-	// The extra context parameter is not a Go parameter.
-	paramIsGoParam = 1 << iota
+	// Parameter may have the deferenceable_or_null attribute. This attribute
+	// cannot be applied to unsafe.Pointer and to the data pointer of slices.
+	paramIsDeferenceableOrNull = 1 << iota
 )

 // createRuntimeCallCommon creates a runtime call. Use createRuntimeCall or
 // createRuntimeInvoke instead.
 func (b *builder) createRuntimeCallCommon(fnName string, args []llvm.Value, name string, isInvoke bool) llvm.Value {
-	member := b.program.ImportedPackage("runtime").Members[fnName]
-	if member == nil {
-		panic("unknown runtime call: " + fnName)
-	}
-	fn := member.(*ssa.Function)
-	fnType, llvmFn := b.getFunction(fn)
+	fn := b.program.ImportedPackage("runtime").Members[fnName].(*ssa.Function)
+	llvmFn := b.getFunction(fn)
 	if llvmFn.IsNil() {
 		panic("trying to call non-existent function: " + fn.RelString(nil))
 	}
-	args = append(args, llvm.Undef(b.dataPtrType)) // unused context parameter
+	args = append(args, llvm.Undef(b.i8ptrType)) // unused context parameter
 	if isInvoke {
-		return b.createInvoke(fnType, llvmFn, args, name)
+		return b.createInvoke(llvmFn, args, name)
 	}
-	return b.createCall(fnType, llvmFn, args, name)
+	return b.createCall(llvmFn, args, name)
 }

 // createRuntimeCall creates a new call to runtime.<fnName> with the given
@@ -70,22 +65,22 @@ func (b *builder) createRuntimeInvoke(fnName string, args []llvm.Value, name str

 // createCall creates a call to the given function with the arguments possibly
 // expanded.
-func (b *builder) createCall(fnType llvm.Type, fn llvm.Value, args []llvm.Value, name string) llvm.Value {
+func (b *builder) createCall(fn llvm.Value, args []llvm.Value, name string) llvm.Value {
 	expanded := make([]llvm.Value, 0, len(args))
 	for _, arg := range args {
 		fragments := b.expandFormalParam(arg)
 		expanded = append(expanded, fragments...)
 	}
-	return b.CreateCall(fnType, fn, expanded, name)
+	return b.CreateCall(fn, expanded, name)
 }

 // createInvoke is like createCall but continues execution at the landing pad if
 // the call resulted in a panic.
-func (b *builder) createInvoke(fnType llvm.Type, fn llvm.Value, args []llvm.Value, name string) llvm.Value {
+func (b *builder) createInvoke(fn llvm.Value, args []llvm.Value, name string) llvm.Value {
 	if b.hasDeferFrame() {
 		b.createInvokeCheckpoint()
 	}
-	return b.createCall(fnType, fn, args, name)
+	return b.createCall(fn, args, name)
 }

 // Expand an argument type to a list that can be used in a function call
@@ -101,7 +96,13 @@ func (c *compilerContext) expandFormalParamType(t llvm.Type, name string, goType
 		// failed to expand this parameter: too many fields
 	}
 	// TODO: split small arrays
-	return []paramInfo{c.getParamInfo(t, name, goType)}
+	return []paramInfo{
+		{
+			llvmType: t,
+			name:     name,
+			flags:    getTypeFlags(goType),
+		},
+	}
 }

 // expandFormalParamOffsets returns a list of offsets from the start of an
@@ -151,6 +152,7 @@ func (b *builder) expandFormalParam(v llvm.Value) []llvm.Value {
 // Try to flatten a struct type to a list of types. Returns a 1-element slice
 // with the passed in type if this is not possible.
 func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType types.Type) []paramInfo {
+	typeFlags := getTypeFlags(goType)
 	switch t.TypeKind() {
 	case llvm.StructTypeKind:
 		var paramInfos []paramInfo
@@ -181,38 +183,40 @@ func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType
 				}
 			}
 			subInfos := c.flattenAggregateType(subfield, name+"."+suffix, extractSubfield(goType, i))
+			for i := range subInfos {
+				subInfos[i].flags |= typeFlags
+			}
 			paramInfos = append(paramInfos, subInfos...)
 		}
 		return paramInfos
 	default:
-		return []paramInfo{c.getParamInfo(t, name, goType)}
+		return []paramInfo{
+			{
+				llvmType: t,
+				name:     name,
+				flags:    typeFlags,
+			},
+		}
 	}
 }

-// getParamInfo collects information about a parameter. For example, if this
-// parameter is pointer-like, it will also store the element type for the
-// dereferenceable_or_null attribute.
-func (c *compilerContext) getParamInfo(t llvm.Type, name string, goType types.Type) paramInfo {
-	info := paramInfo{
-		llvmType: t,
-		name:     name,
-		flags:    paramIsGoParam,
+// getTypeFlags returns the type flags for a given type. It will not recurse
+// into sub-types (such as in structs).
+func getTypeFlags(t types.Type) paramFlags {
+	if t == nil {
+		return 0
 	}
-	if goType != nil {
-		switch underlying := goType.Underlying().(type) {
-		case *types.Pointer:
-			// Pointers in Go must either point to an object or be nil.
-			info.elemSize = c.targetData.TypeAllocSize(c.getLLVMType(underlying.Elem()))
-		case *types.Chan:
-			// Channels are implemented simply as a *runtime.channel.
-			info.elemSize = c.targetData.TypeAllocSize(c.getLLVMRuntimeType("channel"))
-		case *types.Map:
-			// Maps are similar to channels: they are implemented as a
-			// *runtime.hashmap.
-			info.elemSize = c.targetData.TypeAllocSize(c.getLLVMRuntimeType("hashmap"))
-		}
+	switch t.Underlying().(type) {
+	case *types.Pointer:
+		// Pointers in Go must either point to an object or be nil.
+		return paramIsDeferenceableOrNull
+	case *types.Chan, *types.Map:
+		// Channels and maps are implemented as pointers pointing to some
+		// object, and follow the same rules as *types.Pointer.
+		return paramIsDeferenceableOrNull
+	default:
+		return 0
 	}
-	return info
 }

 // extractSubfield extracts a field from a struct, or returns null if this is
@@ -235,7 +239,7 @@ func extractSubfield(t types.Type, field int) types.Type {
 	}
 }

-// flattenAggregateTypeOffsets returns the offsets from the start of an object of
+// flattenAggregateTypeOffset returns the offsets from the start of an object of
 // type t if this object were flattened like in flattenAggregate. Used together
 // with flattenAggregate to know the start indices of each value in the
 // non-flattened object.
@@ -4,9 +4,7 @@ package compiler
 // or pseudo-operations that are lowered during goroutine lowering.

 import (
-	"fmt"
 	"go/types"
-	"math"

 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"golang.org/x/tools/go/ssa"
@@ -16,7 +14,7 @@ import (
 func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
 	elementSize := b.targetData.TypeAllocSize(b.getLLVMType(expr.Type().Underlying().(*types.Chan).Elem()))
 	elementSizeValue := llvm.ConstInt(b.uintptrType, elementSize, false)
-	bufSize := b.getValue(expr.Size, getPos(expr))
+	bufSize := b.getValue(expr.Size)
 	b.createChanBoundsCheck(elementSize, bufSize, expr.Size.Type().Underlying().(*types.Basic), expr.Pos())
 	if bufSize.Type().IntTypeWidth() < b.uintptrType.IntTypeWidth() {
 		bufSize = b.CreateZExt(bufSize, b.uintptrType, "")
@@ -29,33 +27,34 @@ func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
 // createChanSend emits a pseudo chan send operation. It is lowered to the
 // actual channel send operation during goroutine lowering.
 func (b *builder) createChanSend(instr *ssa.Send) {
-	ch := b.getValue(instr.Chan, getPos(instr))
-	chanValue := b.getValue(instr.X, getPos(instr))
+	ch := b.getValue(instr.Chan)
+	chanValue := b.getValue(instr.X)

 	// store value-to-send
 	valueType := b.getLLVMType(instr.X.Type())
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaSize llvm.Value
+	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
 	if isZeroSize {
-		valueAlloca = llvm.ConstNull(b.dataPtrType)
+		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
+		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
 	} else {
-		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
 		b.CreateStore(chanValue, valueAlloca)
 	}

-	// Allocate buffer for the channel operation.
-	channelOp := b.getLLVMRuntimeType("channelOp")
-	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")
+	// Allocate blockedlist buffer.
+	channelBlockedList := b.mod.GetTypeByName("runtime.channelBlockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")

 	// Do the send.
-	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAlloca, channelOpAlloca}, "")
+	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")

 	// End the lifetime of the allocas.
 	// This also works around a bug in CoroSplit, at least in LLVM 8:
 	// https://bugs.llvm.org/show_bug.cgi?id=41742
-	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
+	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
 	if !isZeroSize {
-		b.emitLifetimeEnd(valueAlloca, valueAllocaSize)
+		b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
 	}
 }

@@ -63,31 +62,32 @@ func (b *builder) createChanSend(instr *ssa.Send) {
 // actual channel receive operation during goroutine lowering.
 func (b *builder) createChanRecv(unop *ssa.UnOp) llvm.Value {
 	valueType := b.getLLVMType(unop.X.Type().Underlying().(*types.Chan).Elem())
-	ch := b.getValue(unop.X, getPos(unop))
+	ch := b.getValue(unop.X)

 	// Allocate memory to receive into.
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaSize llvm.Value
+	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
 	if isZeroSize {
-		valueAlloca = llvm.ConstNull(b.dataPtrType)
+		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
+		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
 	} else {
-		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
 	}

-	// Allocate buffer for the channel operation.
-	channelOp := b.getLLVMRuntimeType("channelOp")
-	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")
+	// Allocate blockedlist buffer.
+	channelBlockedList := b.mod.GetTypeByName("runtime.channelBlockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")

 	// Do the receive.
-	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAlloca, channelOpAlloca}, "")
+	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
 	var received llvm.Value
 	if isZeroSize {
 		received = llvm.ConstNull(valueType)
 	} else {
-		received = b.CreateLoad(valueType, valueAlloca, "chan.received")
-		b.emitLifetimeEnd(valueAlloca, valueAllocaSize)
+		received = b.CreateLoad(valueAlloca, "chan.received")
+		b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
 	}
-	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
+	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)

 	if unop.CommaOk {
 		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{valueType, b.ctx.Int1Type()}, false))
@@ -126,20 +126,6 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		}
 	}

-	const maxSelectStates = math.MaxUint32 >> 2
-	if len(expr.States) > maxSelectStates {
-		// The runtime code assumes that the number of state must fit in 30 bits
-		// (so the select index can be stored in a uint32 with two bits reserved
-		// for other purposes). It seems unlikely that a real program would have
-		// that many states, but we check for this case anyway to be sure.
-		// We use a uint32 (and not a uintptr or uint64) to avoid 64-bit atomic
-		// operations which aren't available everywhere.
-		b.addError(expr.Pos(), fmt.Sprintf("too many select states: got %d but the maximum supported number is %d", len(expr.States), maxSelectStates))
-
-		// Continue as usual (we'll generate broken code but the error will
-		// prevent the compilation to complete).
-	}
-
 	// This code create a (stack-allocated) slice containing all the select
 	// cases and then calls runtime.chanSelect to perform the actual select
 	// statement.
@@ -154,7 +140,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	var selectStates []llvm.Value
 	chanSelectStateType := b.getLLVMRuntimeType("chanSelectState")
 	for _, state := range expr.States {
-		ch := b.getValue(state.Chan, state.Pos)
+		ch := b.getValue(state.Chan)
 		selectState := llvm.ConstNull(chanSelectStateType)
 		selectState = b.CreateInsertValue(selectState, ch, 0, "")
 		switch state.Dir {
@@ -170,10 +156,11 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		case types.SendOnly:
 			// Store this value in an alloca and put a pointer to this alloca
 			// in the send state.
-			sendValue := b.getValue(state.Send, state.Pos)
+			sendValue := b.getValue(state.Send)
 			alloca := llvmutil.CreateEntryBlockAlloca(b.Builder, sendValue.Type(), "select.send.value")
 			b.CreateStore(sendValue, alloca)
-			selectState = b.CreateInsertValue(selectState, alloca, 1, "")
+			ptr := b.CreateBitCast(alloca, b.i8ptrType, "")
+			selectState = b.CreateInsertValue(selectState, ptr, 1, "")
 		default:
 			panic("unreachable")
 		}
@@ -181,12 +168,12 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	}

 	// Create a receive buffer, where the received value will be stored.
-	recvbuf := llvm.Undef(b.dataPtrType)
+	recvbuf := llvm.Undef(b.i8ptrType)
 	if recvbufSize != 0 {
 		allocaType := llvm.ArrayType(b.ctx.Int8Type(), int(recvbufSize))
-		recvbufAlloca, _ := b.createTemporaryAlloca(allocaType, "select.recvbuf.alloca")
+		recvbufAlloca, _, _ := b.createTemporaryAlloca(allocaType, "select.recvbuf.alloca")
 		recvbufAlloca.SetAlignment(recvbufAlign)
-		recvbuf = b.CreateGEP(allocaType, recvbufAlloca, []llvm.Value{
+		recvbuf = b.CreateGEP(recvbufAlloca, []llvm.Value{
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		}, "select.recvbuf")
@@ -194,16 +181,16 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {

 	// Create the states slice (allocated on the stack).
 	statesAllocaType := llvm.ArrayType(chanSelectStateType, len(selectStates))
-	statesAlloca, statesSize := b.createTemporaryAlloca(statesAllocaType, "select.states.alloca")
+	statesAlloca, statesI8, statesSize := b.createTemporaryAlloca(statesAllocaType, "select.states.alloca")
 	for i, state := range selectStates {
 		// Set each slice element to the appropriate channel.
-		gep := b.CreateGEP(statesAllocaType, statesAlloca, []llvm.Value{
+		gep := b.CreateGEP(statesAlloca, []llvm.Value{
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 			llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
 		}, "")
 		b.CreateStore(state, gep)
 	}
-	statesPtr := b.CreateGEP(statesAllocaType, statesAlloca, []llvm.Value{
+	statesPtr := b.CreateGEP(statesAlloca, []llvm.Value{
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 	}, "select.states")
@@ -214,10 +201,10 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	if expr.Blocking {
 		// Stack-allocate operation structures.
 		// If these were simply created as a slice, they would heap-allocate.
-		opsAllocaType := llvm.ArrayType(b.getLLVMRuntimeType("channelOp"), len(selectStates))
-		opsAlloca, opsSize := b.createTemporaryAlloca(opsAllocaType, "select.block.alloca")
-		opsLen := llvm.ConstInt(b.uintptrType, uint64(len(selectStates)), false)
-		opsPtr := b.CreateGEP(opsAllocaType, opsAlloca, []llvm.Value{
+		chBlockAllocaType := llvm.ArrayType(b.getLLVMRuntimeType("channelBlockedList"), len(selectStates))
+		chBlockAlloca, chBlockAllocaPtr, chBlockSize := b.createTemporaryAlloca(chBlockAllocaType, "select.block.alloca")
+		chBlockLen := llvm.ConstInt(b.uintptrType, uint64(len(selectStates)), false)
+		chBlockPtr := b.CreateGEP(chBlockAlloca, []llvm.Value{
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		}, "select.block")
@@ -225,23 +212,20 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		results = b.createRuntimeCall("chanSelect", []llvm.Value{
 			recvbuf,
 			statesPtr, statesLen, statesLen, // []chanSelectState
-			opsPtr, opsLen, opsLen, // []channelOp
+			chBlockPtr, chBlockLen, chBlockLen, // []channelBlockList
 		}, "select.result")

 		// Terminate the lifetime of the operation structures.
-		b.emitLifetimeEnd(opsAlloca, opsSize)
+		b.emitLifetimeEnd(chBlockAllocaPtr, chBlockSize)
 	} else {
-		opsPtr := llvm.ConstNull(b.dataPtrType)
-		opsLen := llvm.ConstInt(b.uintptrType, 0, false)
-		results = b.createRuntimeCall("chanSelect", []llvm.Value{
+		results = b.createRuntimeCall("tryChanSelect", []llvm.Value{
 			recvbuf,
 			statesPtr, statesLen, statesLen, // []chanSelectState
-			opsPtr, opsLen, opsLen, // []channelOp (nil slice)
 		}, "select.result")
 	}

 	// Terminate the lifetime of the states alloca.
-	b.emitLifetimeEnd(statesAlloca, statesSize)
+	b.emitLifetimeEnd(statesI8, statesSize)

 	// The result value does not include all the possible received values,
 	// because we can't load them in advance. Instead, the *ssa.Extract
@@ -263,7 +247,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 	if expr.Index == 0 {
 		// index
-		value := b.getValue(expr.Tuple, getPos(expr))
+		value := b.getValue(expr.Tuple)
 		index := b.CreateExtractValue(value, expr.Index, "")
 		if index.Type().IntTypeWidth() < b.intType.IntTypeWidth() {
 			index = b.CreateSExt(index, b.intType, "")
@@ -271,7 +255,7 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		return index
 	} else if expr.Index == 1 {
 		// comma-ok
-		value := b.getValue(expr.Tuple, getPos(expr))
+		value := b.getValue(expr.Tuple)
 		return b.CreateExtractValue(value, expr.Index, "")
 	} else {
 		// Select statements are (index, ok, ...) where ... is a number of
@@ -280,7 +264,8 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		// receive can proceed at a time) so we'll get that alloca, bitcast
 		// it to the correct type, and dereference it.
 		recvbuf := b.selectRecvBuf[expr.Tuple.(*ssa.Select)]
-		typ := b.getLLVMType(expr.Type())
-		return b.CreateLoad(typ, recvbuf, "")
+		typ := llvm.PointerType(b.getLLVMType(expr.Type()), 0)
+		ptr := b.CreateBitCast(recvbuf, typ, "")
+		return b.CreateLoad(ptr, "")
 	}
 }
@@ -9,7 +9,6 @@ import (
 	"testing"

 	"github.com/tinygo-org/tinygo/compileopts"
-	"github.com/tinygo-org/tinygo/goenv"
 	"github.com/tinygo-org/tinygo/loader"
 	"tinygo.org/x/go-llvm"
 )
@@ -28,12 +27,6 @@ type testCase struct {
 func TestCompiler(t *testing.T) {
 	t.Parallel()

-	// Determine Go minor version (e.g. 16 in go1.16.3).
-	_, goMinor, err := goenv.GetGorootVersion()
-	if err != nil {
-		t.Fatal("could not read Go version:", err)
-	}
-
 	// Determine which tests to run, depending on the Go and LLVM versions.
 	tests := []testCase{
 		{"basic.go", "", ""},
@@ -49,13 +42,6 @@ func TestCompiler(t *testing.T) {
 		{"goroutine.go", "cortex-m-qemu", "tasks"},
 		{"channel.go", "", ""},
 		{"gc.go", "", ""},
-		{"zeromap.go", "", ""},
-	}
-	if goMinor >= 20 {
-		tests = append(tests, testCase{"go1.20.go", "", ""})
-	}
-	if goMinor >= 21 {
-		tests = append(tests, testCase{"go1.21.go", "", ""})
 	}

 	for _, tc := range tests {
@@ -73,11 +59,51 @@ func TestCompiler(t *testing.T) {
 			options := &compileopts.Options{
 				Target: targetString,
 			}
+			target, err := compileopts.LoadTarget(options)
+			if err != nil {
+				t.Fatal("failed to load target:", err)
+			}
 			if tc.scheduler != "" {
 				options.Scheduler = tc.scheduler
 			}
+			config := &compileopts.Config{
+				Options: options,
+				Target:  target,
+			}
+			compilerConfig := &Config{
+				Triple:             config.Triple(),
+				Features:           config.Features(),
+				GOOS:               config.GOOS(),
+				GOARCH:             config.GOARCH(),
+				CodeModel:          config.CodeModel(),
+				RelocationModel:    config.RelocationModel(),
+				Scheduler:          config.Scheduler(),
+				AutomaticStackSize: config.AutomaticStackSize(),
+				DefaultStackSize:   config.StackSize(),
+				NeedsStackObjects:  config.NeedsStackObjects(),
+			}
+			machine, err := NewTargetMachine(compilerConfig)
+			if err != nil {
+				t.Fatal("failed to create target machine:", err)
+			}
+			defer machine.Dispose()

-			mod, errs := testCompilePackage(t, options, tc.file)
+			// Load entire program AST into memory.
+			lprogram, err := loader.Load(config, "./testdata/"+tc.file, config.ClangHeaders, types.Config{
+				Sizes: Sizes(machine),
+			})
+			if err != nil {
+				t.Fatal("failed to create target machine:", err)
+			}
+			err = lprogram.Parse()
+			if err != nil {
+				t.Fatalf("could not parse test case %s: %s", tc.file, err)
+			}
+
+			// Compile AST to IR.
+			program := lprogram.LoadSSA()
+			pkg := lprogram.MainPkg()
+			mod, errs := CompilePackage(tc.file, pkg, program.Package(pkg.Pkg), machine, compilerConfig, false)
 			if errs != nil {
 				for _, err := range errs {
 					t.Error(err)
@@ -85,18 +111,20 @@ func TestCompiler(t *testing.T) {
 				return
 			}

-			err := llvm.VerifyModule(mod, llvm.PrintMessageAction)
+			err = llvm.VerifyModule(mod, llvm.PrintMessageAction)
 			if err != nil {
 				t.Error(err)
 			}

 			// Optimize IR a little.
-			passOptions := llvm.NewPassBuilderOptions()
-			defer passOptions.Dispose()
-			err = mod.RunPasses("instcombine", llvm.TargetMachine{}, passOptions)
-			if err != nil {
-				t.Error(err)
+			funcPasses := llvm.NewFunctionPassManagerForModule(mod)
+			defer funcPasses.Dispose()
+			funcPasses.AddInstructionCombiningPass()
+			funcPasses.InitializeFunc()
+			for fn := mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
+				funcPasses.RunFunc(fn)
 			}
+			funcPasses.FinalizeFunc()

 			outFilePrefix := tc.file[:len(tc.file)-3]
 			if tc.target != "" {
@@ -167,95 +195,12 @@ func filterIrrelevantIRLines(lines []string) []string {
 		if strings.HasPrefix(line, "source_filename = ") {
 			continue
 		}
-		if llvmVersion < 15 && strings.HasPrefix(line, "target datalayout = ") {
+		if llvmVersion < 14 && strings.HasPrefix(line, "target datalayout = ") {
 			// The datalayout string may vary betewen LLVM versions.
-			// Right now test outputs are for LLVM 15 and higher.
+			// Right now test outputs are for LLVM 14 and higher.
 			continue
 		}
 		out = append(out, line)
 	}
 	return out
 }
-
-func TestCompilerErrors(t *testing.T) {
-	t.Parallel()
-
-	// Read expected errors from the test file.
-	var expectedErrors []string
-	errorsFile, err := os.ReadFile("testdata/errors.go")
-	if err != nil {
-		t.Error(err)
-	}
-	errorsFileString := strings.ReplaceAll(string(errorsFile), "\r\n", "\n")
-	for _, line := range strings.Split(errorsFileString, "\n") {
-		if strings.HasPrefix(line, "// ERROR: ") {
-			expectedErrors = append(expectedErrors, strings.TrimPrefix(line, "// ERROR: "))
-		}
-	}
-
-	// Compile the Go file with errors.
-	options := &compileopts.Options{
-		Target: "wasm",
-	}
-	_, errs := testCompilePackage(t, options, "errors.go")
-
-	// Check whether the actual errors match the expected errors.
-	expectedErrorsIdx := 0
-	for _, err := range errs {
-		err := err.(types.Error)
-		position := err.Fset.Position(err.Pos)
-		position.Filename = "errors.go" // don't use a full path
-		if expectedErrorsIdx >= len(expectedErrors) || expectedErrors[expectedErrorsIdx] != err.Msg {
-			t.Errorf("unexpected compiler error: %s: %s", position.String(), err.Msg)
-			continue
-		}
-		expectedErrorsIdx++
-	}
-}
-
-// Build a package given a number of compiler options and a file.
-func testCompilePackage(t *testing.T, options *compileopts.Options, file string) (llvm.Module, []error) {
-	target, err := compileopts.LoadTarget(options)
-	if err != nil {
-		t.Fatal("failed to load target:", err)
-	}
-	config := &compileopts.Config{
-		Options: options,
-		Target:  target,
-	}
-	compilerConfig := &Config{
-		Triple:             config.Triple(),
-		Features:           config.Features(),
-		ABI:                config.ABI(),
-		GOOS:               config.GOOS(),
-		GOARCH:             config.GOARCH(),
-		CodeModel:          config.CodeModel(),
-		RelocationModel:    config.RelocationModel(),
-		Scheduler:          config.Scheduler(),
-		AutomaticStackSize: config.AutomaticStackSize(),
-		DefaultStackSize:   config.StackSize(),
-		NeedsStackObjects:  config.NeedsStackObjects(),
-	}
-	machine, err := NewTargetMachine(compilerConfig)
-	if err != nil {
-		t.Fatal("failed to create target machine:", err)
-	}
-	defer machine.Dispose()
-
-	// Load entire program AST into memory.
-	lprogram, err := loader.Load(config, "./testdata/"+file, types.Config{
-		Sizes: Sizes(machine),
-	})
-	if err != nil {
-		t.Fatal("failed to create target machine:", err)
-	}
-	err = lprogram.Parse()
-	if err != nil {
-		t.Fatalf("could not parse test case %s: %s", file, err)
-	}
-
-	// Compile AST to IR.
-	program := lprogram.LoadSSA()
-	pkg := lprogram.MainPkg()
-	return CompilePackage(file, pkg, program.Package(pkg.Pkg), machine, compilerConfig, false)
-}
@@ -16,7 +16,6 @@ package compiler
 import (
 	"go/types"
 	"strconv"
-	"strings"

 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"golang.org/x/tools/go/ssa"
@@ -61,8 +60,9 @@ func (b *builder) deferInitFunc() {
 	b.deferBuiltinFuncs = make(map[ssa.Value]deferBuiltin)

 	// Create defer list pointer.
-	b.deferPtr = b.CreateAlloca(b.dataPtrType, "deferPtr")
-	b.CreateStore(llvm.ConstPointerNull(b.dataPtrType), b.deferPtr)
+	deferType := llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)
+	b.deferPtr = b.CreateAlloca(deferType, "deferPtr")
+	b.CreateStore(llvm.ConstPointerNull(deferType), b.deferPtr)

 	if b.hasDeferFrame() {
 		// Set up the defer frame with the current stack pointer.
@@ -161,10 +161,10 @@ str x2, [x1, #8]
 mov x0, #0
 1:
 `
-		constraints = "={x0},{x1},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{nzcv},~{ffr},~{memory}"
-		if b.GOOS != "darwin" && b.GOOS != "windows" {
+		constraints = "={x0},{x1},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{nzcv},~{ffr},~{vg},~{memory}"
+		if b.GOOS != "darwin" {
 			// These registers cause the following warning when compiling for
-			// MacOS and Windows:
+			// MacOS:
 			//     warning: inline asm clobber list contains reserved registers:
 			//     X18, FP
 			//     Reserved registers on the clobber list may not be preserved
@@ -188,24 +188,6 @@ std z+5, r29
 ldi r24, 0
 1:`
 		constraints = "={r24},z,~{r0},~{r2},~{r3},~{r4},~{r5},~{r6},~{r7},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{r16},~{r17},~{r18},~{r19},~{r20},~{r21},~{r22},~{r23},~{r25},~{r26},~{r27}"
-	case "mips":
-		// $4 flag (zero or non-zero)
-		// $5 defer frame
-		asmString = `
-.set noat
-move $$4, $$zero
-jal 1f
-1:
-addiu $$ra, 8
-sw $$ra, 4($$5)
-.set at`
-		constraints = "={$4},{$5},~{$1},~{$2},~{$3},~{$5},~{$6},~{$7},~{$8},~{$9},~{$10},~{$11},~{$12},~{$13},~{$14},~{$15},~{$16},~{$17},~{$18},~{$19},~{$20},~{$21},~{$22},~{$23},~{$24},~{$25},~{$26},~{$27},~{$28},~{$29},~{$30},~{$31},~{memory}"
-		if !strings.Contains(b.Features, "+soft-float") {
-			// Using floating point registers together with GOMIPS=softfloat
-			// results in a crash: "This value type is not natively supported!"
-			// So only add them when using hardfloat.
-			constraints += ",~{$f0},~{$f1},~{$f2},~{$f3},~{$f4},~{$f5},~{$f6},~{$f7},~{$f8},~{$f9},~{$f10},~{$f11},~{$f12},~{$f13},~{$f14},~{$f15},~{$f16},~{$f17},~{$f18},~{$f19},~{$f20},~{$f21},~{$f22},~{$f23},~{$f24},~{$f25},~{$f26},~{$f27},~{$f28},~{$f29},~{$f30},~{$f31}"
-		}
 	case "riscv32":
 		asmString = `
 la a2, 1f
@@ -219,7 +201,7 @@ li a0, 0
 	}
 	asmType := llvm.FunctionType(resultType, []llvm.Type{b.deferFrame.Type()}, false)
 	asm := llvm.InlineAsm(asmType, asmString, constraints, false, false, 0, false)
-	result := b.CreateCall(asmType, asm, []llvm.Value{b.deferFrame}, "setjmp")
+	result := b.CreateCall(asm, []llvm.Value{b.deferFrame}, "setjmp")
 	result.AddCallSiteAttribute(-1, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("returns_twice"), 0))
 	isZero := b.CreateICmp(llvm.IntEQ, result, llvm.ConstInt(resultType, 0, false), "setjmp.result")
 	continueBB := b.insertBasicBlock("")
@@ -267,7 +249,7 @@ func isInLoop(start *ssa.BasicBlock) bool {
 func (b *builder) createDefer(instr *ssa.Defer) {
 	// The pointer to the previous defer struct, which we will replace to
 	// make a linked list.
-	next := b.CreateLoad(b.dataPtrType, b.deferPtr, "defer.next")
+	next := b.CreateLoad(b.deferPtr, "defer.next")

 	var values []llvm.Value
 	valueTypes := []llvm.Type{b.uintptrType, next.Type()}
@@ -284,13 +266,13 @@ func (b *builder) createDefer(instr *ssa.Defer) {

 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields, followed by the call parameters).
-		itf := b.getValue(instr.Call.Value, getPos(instr)) // interface
+		itf := b.getValue(instr.Call.Value) // interface
 		typecode := b.CreateExtractValue(itf, 0, "invoke.func.typecode")
 		receiverValue := b.CreateExtractValue(itf, 1, "invoke.func.receiver")
 		values = []llvm.Value{callback, next, typecode, receiverValue}
-		valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
+		valueTypes = append(valueTypes, b.uintptrType, b.i8ptrType)
 		for _, arg := range instr.Call.Args {
-			val := b.getValue(arg, getPos(instr))
+			val := b.getValue(arg)
 			values = append(values, val)
 			valueTypes = append(valueTypes, val.Type())
 		}
@@ -307,7 +289,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// runtime._defer fields).
 		values = []llvm.Value{callback, next}
 		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
+			llvmParam := b.getValue(param)
 			values = append(values, llvmParam)
 			valueTypes = append(valueTypes, llvmParam.Type())
 		}
@@ -319,7 +301,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// pointer.
 		// TODO: ignore this closure entirely and put pointers to the free
 		// variables directly in the defer struct, avoiding a memory allocation.
-		closure := b.getValue(instr.Call.Value, getPos(instr))
+		closure := b.getValue(instr.Call.Value)
 		context := b.CreateExtractValue(closure, 0, "")

 		// Get the callback number.
@@ -335,7 +317,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// context pointer).
 		values = []llvm.Value{callback, next}
 		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
+			llvmParam := b.getValue(param)
 			values = append(values, llvmParam)
 			valueTypes = append(valueTypes, llvmParam.Type())
 		}
@@ -347,7 +329,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		var argValues []llvm.Value
 		for _, arg := range instr.Call.Args {
 			argTypes = append(argTypes, arg.Type())
-			argValues = append(argValues, b.getValue(arg, getPos(instr)))
+			argValues = append(argValues, b.getValue(arg))
 		}

 		if _, ok := b.deferBuiltinFuncs[instr.Call.Value]; !ok {
@@ -370,7 +352,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		}

 	} else {
-		funcValue := b.getValue(instr.Call.Value, getPos(instr))
+		funcValue := b.getValue(instr.Call.Value)

 		if _, ok := b.deferExprFuncs[instr.Call.Value]; !ok {
 			b.deferExprFuncs[instr.Call.Value] = len(b.allDeferFuncs)
@@ -385,7 +367,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		values = []llvm.Value{callback, next, funcValue}
 		valueTypes = append(valueTypes, funcValue.Type())
 		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param, getPos(instr))
+			llvmParam := b.getValue(param)
 			values = append(values, llvmParam)
 			valueTypes = append(valueTypes, llvmParam.Type())
 		}
@@ -408,8 +390,9 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// This may be hit a variable number of times, so use a heap allocation.
 		size := b.targetData.TypeAllocSize(deferredCallType)
 		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
-		nilPtr := llvm.ConstNull(b.dataPtrType)
-		alloca = b.createRuntimeCall("alloc", []llvm.Value{sizeValue, nilPtr}, "defer.alloc.call")
+		nilPtr := llvm.ConstNull(b.i8ptrType)
+		allocCall := b.createRuntimeCall("alloc", []llvm.Value{sizeValue, nilPtr}, "defer.alloc.call")
+		alloca = b.CreateBitCast(allocCall, llvm.PointerType(deferredCallType, 0), "defer.alloc")
 	}
 	if b.NeedsStackObjects {
 		b.trackPointer(alloca)
@@ -417,13 +400,12 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 	b.CreateStore(deferredCall, alloca)

 	// Push it on top of the linked list by replacing deferPtr.
-	b.CreateStore(alloca, b.deferPtr)
+	allocaCast := b.CreateBitCast(alloca, next.Type(), "defer.alloca.cast")
+	b.CreateStore(allocaCast, b.deferPtr)
 }

 // createRunDefers emits code to run all deferred functions.
 func (b *builder) createRunDefers() {
-	deferType := b.getLLVMRuntimeType("_defer")
-
 	// Add a loop like the following:
 	//     for stack != nil {
 	//         _stack := stack
@@ -449,7 +431,7 @@ func (b *builder) createRunDefers() {
 	// Create loop head:
 	//     for stack != nil {
 	b.SetInsertPointAtEnd(loophead)
-	deferData := b.CreateLoad(b.dataPtrType, b.deferPtr, "")
+	deferData := b.CreateLoad(b.deferPtr, "")
 	stackIsNil := b.CreateICmp(llvm.IntEQ, deferData, llvm.ConstPointerNull(deferData.Type()), "stackIsNil")
 	b.CreateCondBr(stackIsNil, end, loop)

@@ -458,17 +440,17 @@ func (b *builder) createRunDefers() {
 	//     stack = stack.next
 	//     switch stack.callback {
 	b.SetInsertPointAtEnd(loop)
-	nextStackGEP := b.CreateInBoundsGEP(deferType, deferData, []llvm.Value{
+	nextStackGEP := b.CreateInBoundsGEP(deferData, []llvm.Value{
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		llvm.ConstInt(b.ctx.Int32Type(), 1, false), // .next field
 	}, "stack.next.gep")
-	nextStack := b.CreateLoad(b.dataPtrType, nextStackGEP, "stack.next")
+	nextStack := b.CreateLoad(nextStackGEP, "stack.next")
 	b.CreateStore(nextStack, b.deferPtr)
-	gep := b.CreateInBoundsGEP(deferType, deferData, []llvm.Value{
+	gep := b.CreateInBoundsGEP(deferData, []llvm.Value{
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false), // .callback field
 	}, "callback.gep")
-	callback := b.CreateLoad(b.uintptrType, gep, "callback")
+	callback := b.CreateLoad(gep, "callback")
 	sw := b.CreateSwitch(callback, unreachable, len(b.allDeferFuncs))

 	for i, callback := range b.allDeferFuncs {
@@ -483,32 +465,33 @@ func (b *builder) createRunDefers() {
 			// Call on an value or interface value.

 			// Get the real defer struct type and cast to it.
-			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
+			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}

 			if !callback.IsInvoke() {
 				//Expect funcValue to be passed through the deferred call.
 				valueTypes = append(valueTypes, b.getFuncType(callback.Signature()))
 			} else {
 				//Expect typecode
-				valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
+				valueTypes = append(valueTypes, b.uintptrType, b.i8ptrType)
 			}

 			for _, arg := range callback.Args {
 				valueTypes = append(valueTypes, b.getLLVMType(arg.Type()))
 			}

+			deferredCallType := b.ctx.StructType(valueTypes, false)
+			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")
+
 			// Extract the params from the struct (including receiver).
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			deferredCallType := b.ctx.StructType(valueTypes, false)
 			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
+				gep := b.CreateInBoundsGEP(deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "gep")
+				forwardParam := b.CreateLoad(gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}

 			var fnPtr llvm.Value
-			var fnType llvm.Type

 			if !callback.IsInvoke() {
 				// Isolate the func value.
@@ -516,9 +499,8 @@ func (b *builder) createRunDefers() {
 				forwardParams = forwardParams[1:]

 				//Get function pointer and context
-				var context llvm.Value
-				fnPtr, context = b.decodeFuncValue(funcValue)
-				fnType = b.getLLVMFunctionType(callback.Signature())
+				fp, context := b.decodeFuncValue(funcValue, callback.Signature())
+				fnPtr = fp

 				//Pass context
 				forwardParams = append(forwardParams, context)
@@ -527,75 +509,74 @@ func (b *builder) createRunDefers() {
 				// parameters.
 				forwardParams = append(forwardParams[1:], forwardParams[0])
 				fnPtr = b.getInvokeFunction(callback)
-				fnType = fnPtr.GlobalValueType()

 				// Add the context parameter. An interface call cannot also be a
 				// closure but we have to supply the parameter anyway for platforms
 				// with a strict calling convention.
-				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
+				forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))
 			}

-			b.createCall(fnType, fnPtr, forwardParams, "")
+			b.createCall(fnPtr, forwardParams, "")

 		case *ssa.Function:
 			// Direct call.

 			// Get the real defer struct type and cast to it.
-			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
+			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
 			for _, param := range getParams(callback.Signature) {
 				valueTypes = append(valueTypes, b.getLLVMType(param.Type()))
 			}
 			deferredCallType := b.ctx.StructType(valueTypes, false)
+			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := range getParams(callback.Signature) {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
+				gep := b.CreateInBoundsGEP(deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
+				forwardParam := b.CreateLoad(gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}

-			// Plain TinyGo functions add some extra parameters to implement async functionality and function receivers.
+			// Plain TinyGo functions add some extra parameters to implement async functionality and function recievers.
 			// These parameters should not be supplied when calling into an external C/ASM function.
 			if !b.getFunctionInfo(callback).exported {
 				// Add the context parameter. We know it is ignored by the receiving
 				// function, but we have to pass one anyway.
-				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
+				forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))
 			}

 			// Call real function.
-			fnType, fn := b.getFunction(callback)
-			b.createInvoke(fnType, fn, forwardParams, "")
+			b.createInvoke(b.getFunction(callback), forwardParams, "")

 		case *ssa.MakeClosure:
 			// Get the real defer struct type and cast to it.
 			fn := callback.Fn.(*ssa.Function)
-			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
+			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
 			params := fn.Signature.Params()
 			for i := 0; i < params.Len(); i++ {
 				valueTypes = append(valueTypes, b.getLLVMType(params.At(i).Type()))
 			}
-			valueTypes = append(valueTypes, b.dataPtrType) // closure
+			valueTypes = append(valueTypes, b.i8ptrType) // closure
 			deferredCallType := b.ctx.StructType(valueTypes, false)
+			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "")
-				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
+				gep := b.CreateInBoundsGEP(deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "")
+				forwardParam := b.CreateLoad(gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}

 			// Call deferred function.
-			fnType, llvmFn := b.getFunction(fn)
-			b.createCall(fnType, llvmFn, forwardParams, "")
+			b.createCall(b.getFunction(fn), forwardParams, "")
 		case *ssa.Builtin:
 			db := b.deferBuiltinFuncs[callback]

 			//Get parameter types
-			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
+			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}

 			//Get signature from call results
 			params := callback.Type().Underlying().(*types.Signature).Params()
@@ -604,13 +585,14 @@ func (b *builder) createRunDefers() {
 			}

 			deferredCallType := b.ctx.StructType(valueTypes, false)
+			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			var argValues []llvm.Value
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := 0; i < params.Len(); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
-				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
+				gep := b.CreateInBoundsGEP(deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
+				forwardParam := b.CreateLoad(gep, "param")
 				argValues = append(argValues, forwardParam)
 			}

@@ -13,14 +13,34 @@ import (
 // createFuncValue creates a function value from a raw function pointer with no
 // context.
 func (b *builder) createFuncValue(funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
+	return b.compilerContext.createFuncValue(b.Builder, funcPtr, context, sig)
+}
+
+// createFuncValue creates a function value from a raw function pointer with no
+// context.
+func (c *compilerContext) createFuncValue(builder llvm.Builder, funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
 	// Closure is: {context, function pointer}
-	funcValueType := b.getFuncType(sig)
+	funcValueScalar := llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
+	funcValueType := c.getFuncType(sig)
 	funcValue := llvm.Undef(funcValueType)
-	funcValue = b.CreateInsertValue(funcValue, context, 0, "")
-	funcValue = b.CreateInsertValue(funcValue, funcPtr, 1, "")
+	funcValue = builder.CreateInsertValue(funcValue, context, 0, "")
+	funcValue = builder.CreateInsertValue(funcValue, funcValueScalar, 1, "")
 	return funcValue
 }

+// getFuncSignatureID returns a new external global for a given signature. This
+// global reference is not real, it is only used during func lowering to assign
+// signature types to functions and will then be removed.
+func (c *compilerContext) getFuncSignatureID(sig *types.Signature) llvm.Value {
+	sigGlobalName := "reflect/types.funcid:" + getTypeCodeName(sig)
+	sigGlobal := c.mod.NamedGlobal(sigGlobalName)
+	if sigGlobal.IsNil() {
+		sigGlobal = llvm.AddGlobal(c.mod, c.ctx.Int8Type(), sigGlobalName)
+		sigGlobal.SetGlobalConstant(true)
+	}
+	return sigGlobal
+}
+
 // extractFuncScalar returns some scalar that can be used in comparisons. It is
 // a cheap operation.
 func (b *builder) extractFuncScalar(funcValue llvm.Value) llvm.Value {
@@ -34,20 +54,26 @@ func (b *builder) extractFuncContext(funcValue llvm.Value) llvm.Value {
 }

 // decodeFuncValue extracts the context and the function pointer from this func
-// value.
-func (b *builder) decodeFuncValue(funcValue llvm.Value) (funcPtr, context llvm.Value) {
+// value. This may be an expensive operation.
+func (b *builder) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcPtr, context llvm.Value) {
 	context = b.CreateExtractValue(funcValue, 0, "")
-	funcPtr = b.CreateExtractValue(funcValue, 1, "")
+	bitcast := b.CreateExtractValue(funcValue, 1, "")
+	if !bitcast.IsAConstantExpr().IsNil() && bitcast.Opcode() == llvm.BitCast {
+		funcPtr = bitcast.Operand(0)
+		return
+	}
+	llvmSig := b.getRawFuncType(sig)
+	funcPtr = b.CreateBitCast(bitcast, llvmSig, "")
 	return
 }

 // getFuncType returns the type of a func value given a signature.
 func (c *compilerContext) getFuncType(typ *types.Signature) llvm.Type {
-	return c.ctx.StructType([]llvm.Type{c.dataPtrType, c.funcPtrType}, false)
+	return c.ctx.StructType([]llvm.Type{c.i8ptrType, c.rawVoidFuncType}, false)
 }

-// getLLVMFunctionType returns a LLVM function type for a given signature.
-func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
+// getRawFuncType returns a LLVM function pointer type for a given signature.
+func (c *compilerContext) getRawFuncType(typ *types.Signature) llvm.Type {
 	// Get the return type.
 	var returnType llvm.Type
 	switch typ.Results().Len() {
@@ -75,7 +101,7 @@ func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
 		if recv.StructName() == "runtime._interface" {
 			// This is a call on an interface, not a concrete type.
 			// The receiver is not an interface, but a i8* type.
-			recv = c.dataPtrType
+			recv = c.i8ptrType
 		}
 		for _, info := range c.expandFormalParamType(recv, "", nil) {
 			paramTypes = append(paramTypes, info.llvmType)
@@ -88,10 +114,10 @@ func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
 		}
 	}
 	// All functions take these parameters at the end.
-	paramTypes = append(paramTypes, c.dataPtrType) // context
+	paramTypes = append(paramTypes, c.i8ptrType) // context

 	// Make a func type out of the signature.
-	return llvm.FunctionType(returnType, paramTypes, false)
+	return llvm.PointerType(llvm.FunctionType(returnType, paramTypes, false), c.funcPtrAddrSpace)
 }

 // parseMakeClosure makes a function value (with context) from the given
@@ -106,7 +132,7 @@ func (b *builder) parseMakeClosure(expr *ssa.MakeClosure) (llvm.Value, error) {
 	boundVars := make([]llvm.Value, len(expr.Bindings))
 	for i, binding := range expr.Bindings {
 		// The context stores the bound variables.
-		llvmBoundVar := b.getValue(binding, getPos(expr))
+		llvmBoundVar := b.getValue(binding)
 		boundVars[i] = llvmBoundVar
 	}

@@ -115,6 +141,5 @@ func (b *builder) parseMakeClosure(expr *ssa.MakeClosure) (llvm.Value, error) {
 	context := b.emitPointerPack(boundVars)

 	// Create the closure.
-	_, fn := b.getFunction(f)
-	return b.createFuncValue(fn, context, f.Signature), nil
+	return b.createFuncValue(b.getFunction(f), context, f.Signature), nil
 }
@@ -78,10 +78,13 @@ func (b *builder) trackValue(value llvm.Value) {
 	}
 }

-// trackPointer creates a call to runtime.trackPointer, bitcasting the pointer
+// trackPointer creates a call to runtime.trackPointer, bitcasting the poitner
 // first if needed. The input value must be of LLVM pointer type.
 func (b *builder) trackPointer(value llvm.Value) {
-	b.createRuntimeCall("trackPointer", []llvm.Value{value, b.stackChainAlloca}, "")
+	if value.Type() != b.i8ptrType {
+		value = b.CreateBitCast(value, b.i8ptrType, "")
+	}
+	b.createRuntimeCall("trackPointer", []llvm.Value{value}, "")
 }

 // typeHasPointers returns whether this type is a pointer or contains pointers.
@@ -14,7 +14,36 @@ import (

 // createGo emits code to start a new goroutine.
 func (b *builder) createGo(instr *ssa.Go) {
-	if builtin, ok := instr.Call.Value.(*ssa.Builtin); ok {
+	// Get all function parameters to pass to the goroutine.
+	var params []llvm.Value
+	for _, param := range instr.Call.Args {
+		params = append(params, b.getValue(param))
+	}
+
+	var prefix string
+	var funcPtr llvm.Value
+	hasContext := false
+	if callee := instr.Call.StaticCallee(); callee != nil {
+		// Static callee is known. This makes it easier to start a new
+		// goroutine.
+		var context llvm.Value
+		switch value := instr.Call.Value.(type) {
+		case *ssa.Function:
+			// Goroutine call is regular function call. No context is necessary.
+		case *ssa.MakeClosure:
+			// A goroutine call on a func value, but the callee is trivial to find. For
+			// example: immediately applied functions.
+			funcValue := b.getValue(value)
+			context = b.extractFuncContext(funcValue)
+		default:
+			panic("StaticCallee returned an unexpected value")
+		}
+		if !context.IsNil() {
+			params = append(params, context) // context parameter
+			hasContext = true
+		}
+		funcPtr = b.getFunction(callee)
+	} else if builtin, ok := instr.Call.Value.(*ssa.Builtin); ok {
 		// We cheat. None of the builtins do any long or blocking operation, so
 		// we might as well run these builtins right away without the program
 		// noticing the difference.
@@ -41,49 +70,16 @@ func (b *builder) createGo(instr *ssa.Go) {
 		var argValues []llvm.Value
 		for _, arg := range instr.Call.Args {
 			argTypes = append(argTypes, arg.Type())
-			argValues = append(argValues, b.getValue(arg, getPos(instr)))
+			argValues = append(argValues, b.getValue(arg))
 		}
 		b.createBuiltin(argTypes, argValues, builtin.Name(), instr.Pos())
 		return
-	}
-
-	// Get all function parameters to pass to the goroutine.
-	var params []llvm.Value
-	for _, param := range instr.Call.Args {
-		params = append(params, b.expandFormalParam(b.getValue(param, getPos(instr)))...)
-	}
-
-	var prefix string
-	var funcPtr llvm.Value
-	var funcType llvm.Type
-	hasContext := false
-	if callee := instr.Call.StaticCallee(); callee != nil {
-		// Static callee is known. This makes it easier to start a new
-		// goroutine.
-		var context llvm.Value
-		switch value := instr.Call.Value.(type) {
-		case *ssa.Function:
-			// Goroutine call is regular function call. No context is necessary.
-		case *ssa.MakeClosure:
-			// A goroutine call on a func value, but the callee is trivial to find. For
-			// example: immediately applied functions.
-			funcValue := b.getValue(value, getPos(instr))
-			context = b.extractFuncContext(funcValue)
-		default:
-			panic("StaticCallee returned an unexpected value")
-		}
-		if !context.IsNil() {
-			params = append(params, context) // context parameter
-			hasContext = true
-		}
-		funcType, funcPtr = b.getFunction(callee)
 	} else if instr.Call.IsInvoke() {
 		// This is a method call on an interface value.
-		itf := b.getValue(instr.Call.Value, getPos(instr))
+		itf := b.getValue(instr.Call.Value)
 		itfTypeCode := b.CreateExtractValue(itf, 0, "")
 		itfValue := b.CreateExtractValue(itf, 1, "")
 		funcPtr = b.getInvokeFunction(&instr.Call)
-		funcType = funcPtr.GlobalValueType()
 		params = append([]llvm.Value{itfValue}, params...) // start with receiver
 		params = append(params, itfTypeCode)               // end with typecode
 	} else {
@@ -93,8 +89,7 @@ func (b *builder) createGo(instr *ssa.Go) {
 		//   * The function context, for closures.
 		//   * The function pointer (for tasks).
 		var context llvm.Value
-		funcPtr, context = b.decodeFuncValue(b.getValue(instr.Call.Value, getPos(instr)))
-		funcType = b.getLLVMFunctionType(instr.Call.Value.Type().Underlying().(*types.Signature))
+		funcPtr, context = b.decodeFuncValue(b.getValue(instr.Call.Value), instr.Call.Value.Type().Underlying().(*types.Signature))
 		params = append(params, context, funcPtr)
 		hasContext = true
 		prefix = b.fn.RelString(nil)
@@ -102,14 +97,14 @@ func (b *builder) createGo(instr *ssa.Go) {

 	paramBundle := b.emitPointerPack(params)
 	var stackSize llvm.Value
-	callee := b.createGoroutineStartWrapper(funcType, funcPtr, prefix, hasContext, false, instr.Pos())
+	callee := b.createGoroutineStartWrapper(funcPtr, prefix, hasContext, instr.Pos())
 	if b.AutomaticStackSize {
 		// The stack size is not known until after linking. Call a dummy
 		// function that will be replaced with a load from a special ELF
 		// section that contains the stack size (and is modified after
 		// linking).
-		stackSizeFnType, stackSizeFn := b.getFunction(b.program.ImportedPackage("internal/task").Members["getGoroutineStackSize"].(*ssa.Function))
-		stackSize = b.createCall(stackSizeFnType, stackSizeFn, []llvm.Value{callee, llvm.Undef(b.dataPtrType)}, "stacksize")
+		stackSizeFn := b.getFunction(b.program.ImportedPackage("internal/task").Members["getGoroutineStackSize"].(*ssa.Function))
+		stackSize = b.createCall(stackSizeFn, []llvm.Value{callee, llvm.Undef(b.i8ptrType)}, "stacksize")
 	} else {
 		// The stack size is fixed at compile time. By emitting it here as a
 		// constant, it can be optimized.
@@ -118,149 +113,8 @@ func (b *builder) createGo(instr *ssa.Go) {
 		}
 		stackSize = llvm.ConstInt(b.uintptrType, b.DefaultStackSize, false)
 	}
-	fnType, start := b.getFunction(b.program.ImportedPackage("internal/task").Members["start"].(*ssa.Function))
-	b.createCall(fnType, start, []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.dataPtrType)}, "")
-}
-
-// Create an exported wrapper function for functions with the //go:wasmexport
-// pragma. This wrapper function is quite complex when the scheduler is enabled:
-// it needs to start a new goroutine each time the exported function is called.
-func (b *builder) createWasmExport() {
-	pos := b.info.wasmExportPos
-	if b.info.exported {
-		// //export really shouldn't be used anymore when //go:wasmexport is
-		// available, because //go:wasmexport is much better defined.
-		b.addError(pos, "cannot use //export and //go:wasmexport at the same time")
-		return
-	}
-
-	const suffix = "#wasmexport"
-
-	// Declare the exported function.
-	paramTypes := b.llvmFnType.ParamTypes()
-	exportedFnType := llvm.FunctionType(b.llvmFnType.ReturnType(), paramTypes[:len(paramTypes)-1], false)
-	exportedFn := llvm.AddFunction(b.mod, b.fn.RelString(nil)+suffix, exportedFnType)
-	b.addStandardAttributes(exportedFn)
-	llvmutil.AppendToGlobal(b.mod, "llvm.used", exportedFn)
-	exportedFn.AddFunctionAttr(b.ctx.CreateStringAttribute("wasm-export-name", b.info.wasmExport))
-
-	// Create a builder for this wrapper function.
-	builder := newBuilder(b.compilerContext, b.ctx.NewBuilder(), b.fn)
-	defer builder.Dispose()
-
-	// Define this function as a separate function in DWARF
-	if b.Debug {
-		if b.fn.Syntax() != nil {
-			// Create debug info file if needed.
-			pos := b.program.Fset.Position(pos)
-			builder.difunc = builder.attachDebugInfoRaw(b.fn, exportedFn, suffix, pos.Filename, pos.Line)
-		}
-		builder.setDebugLocation(pos)
-	}
-
-	// Create a single basic block inside of it.
-	bb := llvm.AddBasicBlock(exportedFn, "entry")
-	builder.SetInsertPointAtEnd(bb)
-
-	// Insert an assertion to make sure this //go:wasmexport function is not
-	// called at a time when it is not allowed (for example, before the runtime
-	// is initialized).
-	builder.createRuntimeCall("wasmExportCheckRun", nil, "")
-
-	if b.Scheduler == "none" {
-		// When the scheduler has been disabled, this is really trivial: just
-		// call the function.
-		params := exportedFn.Params()
-		params = append(params, llvm.ConstNull(b.dataPtrType)) // context parameter
-		retval := builder.CreateCall(b.llvmFnType, b.llvmFn, params, "")
-		if b.fn.Signature.Results() == nil {
-			builder.CreateRetVoid()
-		} else {
-			builder.CreateRet(retval)
-		}
-
-	} else {
-		// The scheduler is enabled, so we need to start a new goroutine, wait
-		// for it to complete, and read the result value.
-
-		// Build a function that looks like this:
-		//
-		//   func foo#wasmexport(param0, param1, ..., paramN) {
-		//       var state *stateStruct
-		//
-		//       // 'done' must be explicitly initialized ('state' is not zeroed)
-		//       state.done = false
-		//
-		//       // store the parameters in the state object
-		//       state.param0 = param0
-		//       state.param1 = param1
-		//       ...
-		//       state.paramN = paramN
-		//
-		//       // create a goroutine and push it to the runqueue
-		//       task.start(uintptr(gowrapper), &state)
-		//
-		//       // run the scheduler
-		//       runtime.wasmExportRun(&state.done)
-		//
-		//       // if there is a return value, load it and return
-		//       return state.result
-		//   }
-
-		hasReturn := b.fn.Signature.Results() != nil
-
-		// Build the state struct type.
-		// It stores the function parameters, the 'done' flag, and reserves
-		// space for a return value if needed.
-		stateFields := exportedFnType.ParamTypes()
-		numParams := len(stateFields)
-		stateFields = append(stateFields, b.ctx.Int1Type()) // 'done' field
-		if hasReturn {
-			stateFields = append(stateFields, b.llvmFnType.ReturnType())
-		}
-		stateStruct := b.ctx.StructType(stateFields, false)
-
-		// Allocate the state struct on the stack.
-		statePtr := builder.CreateAlloca(stateStruct, "status")
-
-		// Initialize the 'done' field.
-		doneGEP := builder.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-			llvm.ConstInt(b.ctx.Int32Type(), uint64(numParams), false),
-		}, "done.gep")
-		builder.CreateStore(llvm.ConstNull(b.ctx.Int1Type()), doneGEP)
-
-		// Store all parameters in the state object.
-		for i, param := range exportedFn.Params() {
-			gep := builder.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-				llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-				llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
-			}, "")
-			builder.CreateStore(param, gep)
-		}
-
-		// Create a new goroutine and add it to the runqueue.
-		wrapper := b.createGoroutineStartWrapper(b.llvmFnType, b.llvmFn, "", false, true, pos)
-		stackSize := llvm.ConstInt(b.uintptrType, b.DefaultStackSize, false)
-		taskStartFnType, taskStartFn := builder.getFunction(b.program.ImportedPackage("internal/task").Members["start"].(*ssa.Function))
-		builder.createCall(taskStartFnType, taskStartFn, []llvm.Value{wrapper, statePtr, stackSize, llvm.Undef(b.dataPtrType)}, "")
-
-		// Run the scheduler.
-		builder.createRuntimeCall("wasmExportRun", []llvm.Value{doneGEP}, "")
-
-		// Read the return value (if any) and return to the caller of the
-		// //go:wasmexport function.
-		if hasReturn {
-			gep := builder.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-				llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-				llvm.ConstInt(b.ctx.Int32Type(), uint64(numParams)+1, false),
-			}, "")
-			retval := builder.CreateLoad(b.llvmFnType.ReturnType(), gep, "retval")
-			builder.CreateRet(retval)
-		} else {
-			builder.CreateRetVoid()
-		}
-	}
+	start := b.getFunction(b.program.ImportedPackage("internal/task").Members["start"].(*ssa.Function))
+	b.createCall(start, []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.i8ptrType)}, "")
 }

 // createGoroutineStartWrapper creates a wrapper for the task-based
@@ -286,42 +140,34 @@ func (b *builder) createWasmExport() {
 // to last parameter of the function) is used for this wrapper. If hasContext is
 // false, the parameter bundle is assumed to have no context parameter and undef
 // is passed instead.
-func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.Value, prefix string, hasContext, isWasmExport bool, pos token.Pos) llvm.Value {
+func (c *compilerContext) createGoroutineStartWrapper(fn llvm.Value, prefix string, hasContext bool, pos token.Pos) llvm.Value {
 	var wrapper llvm.Value

-	b := &builder{
-		compilerContext: c,
-		Builder:         c.ctx.NewBuilder(),
-	}
-	defer b.Dispose()
+	builder := c.ctx.NewBuilder()
+	defer builder.Dispose()

 	var deadlock llvm.Value
-	var deadlockType llvm.Type
 	if c.Scheduler == "asyncify" {
-		deadlockType, deadlock = c.getFunction(c.program.ImportedPackage("runtime").Members["deadlock"].(*ssa.Function))
+		deadlock = c.getFunction(c.program.ImportedPackage("runtime").Members["deadlock"].(*ssa.Function))
 	}

 	if !fn.IsAFunction().IsNil() {
 		// See whether this wrapper has already been created. If so, return it.
 		name := fn.Name()
-		wrapperName := name + "$gowrapper"
-		if isWasmExport {
-			wrapperName += "-wasmexport"
-		}
-		wrapper = c.mod.NamedFunction(wrapperName)
+		wrapper = c.mod.NamedFunction(name + "$gowrapper")
 		if !wrapper.IsNil() {
 			return llvm.ConstPtrToInt(wrapper, c.uintptrType)
 		}

 		// Create the wrapper.
-		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType}, false)
-		wrapper = llvm.AddFunction(c.mod, wrapperName, wrapperType)
+		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.i8ptrType}, false)
+		wrapper = llvm.AddFunction(c.mod, name+"$gowrapper", wrapperType)
 		c.addStandardAttributes(wrapper)
 		wrapper.SetLinkage(llvm.LinkOnceODRLinkage)
 		wrapper.SetUnnamedAddr(true)
 		wrapper.AddAttributeAtIndex(-1, c.ctx.CreateStringAttribute("tinygo-gowrapper", name))
 		entry := c.ctx.AddBasicBlock(wrapper, "entry")
-		b.SetInsertPointAtEnd(entry)
+		builder.SetInsertPointAtEnd(entry)

 		if c.Debug {
 			pos := c.program.Fset.Position(pos)
@@ -342,113 +188,26 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 				Optimized:    true,
 			})
 			wrapper.SetSubprogram(difunc)
-			b.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), difunc, llvm.Metadata{})
+			builder.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), difunc, llvm.Metadata{})
 		}

-		if !isWasmExport {
-			// Regular 'go' instruction.
+		// Create the list of params for the call.
+		paramTypes := fn.Type().ElementType().ParamTypes()
+		if !hasContext {
+			paramTypes = paramTypes[:len(paramTypes)-1] // strip context parameter
+		}
+		params := llvmutil.EmitPointerUnpack(builder, c.mod, wrapper.Param(0), paramTypes)
+		if !hasContext {
+			params = append(params, llvm.Undef(c.i8ptrType)) // add dummy context parameter
+		}

-			// Create the list of params for the call.
-			paramTypes := fnType.ParamTypes()
-			if !hasContext {
-				paramTypes = paramTypes[:len(paramTypes)-1] // strip context parameter
-			}
+		// Create the call.
+		builder.CreateCall(fn, params, "")

-			params := b.emitPointerUnpack(wrapper.Param(0), paramTypes)
-			if !hasContext {
-				params = append(params, llvm.Undef(c.dataPtrType)) // add dummy context parameter
-			}
-
-			// Create the call.
-			b.CreateCall(fnType, fn, params, "")
-
-			if c.Scheduler == "asyncify" {
-				b.CreateCall(deadlockType, deadlock, []llvm.Value{
-					llvm.Undef(c.dataPtrType),
-				}, "")
-			}
-		} else {
-			// Goroutine started from a //go:wasmexport pragma.
-			// The function looks like this:
-			//
-			//   func foo$gowrapper-wasmexport(state *stateStruct) {
-			//       // load values
-			//       param0 := state.params[0]
-			//       param1 := state.params[1]
-			//
-			//       // call wrapped functions
-			//       result := foo(param0, param1, ...)
-			//
-			//       // store result value (if there is any)
-			//       state.result = result
-			//
-			//       // finish exported function
-			//       state.done = true
-			//       runtime.wasmExportExit()
-			//   }
-			//
-			// The state object here looks like:
-			//
-			//   struct state {
-			//       param0
-			//       param1
-			//       param* // etc
-			//       done bool
-			//       result returnType
-			//   }
-
-			returnType := fnType.ReturnType()
-			hasReturn := returnType != b.ctx.VoidType()
-			statePtr := wrapper.Param(0)
-
-			// Create the state struct (it must match the type in createWasmExport).
-			stateFields := fnType.ParamTypes()
-			numParams := len(stateFields) - 1
-			stateFields = stateFields[:numParams:numParams]     // strip 'context' parameter
-			stateFields = append(stateFields, c.ctx.Int1Type()) // 'done' bool
-			if hasReturn {
-				stateFields = append(stateFields, returnType)
-			}
-			stateStruct := b.ctx.StructType(stateFields, false)
-
-			// Extract parameters from the state object, and call the function
-			// that's being wrapped.
-			var callParams []llvm.Value
-			for i := 0; i < numParams; i++ {
-				gep := b.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-					llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-					llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
-				}, "")
-				param := b.CreateLoad(stateFields[i], gep, "")
-				callParams = append(callParams, param)
-			}
-			callParams = append(callParams, llvm.ConstNull(c.dataPtrType)) // add 'context' parameter
-			result := b.CreateCall(fnType, fn, callParams, "")
-
-			// Store the return value back into the shared state.
-			// Unlike regular goroutines, these special //go:wasmexport
-			// goroutines can return a value.
-			if hasReturn {
-				gep := b.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-					llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-					llvm.ConstInt(c.ctx.Int32Type(), uint64(numParams)+1, false),
-				}, "result.ptr")
-				b.CreateStore(result, gep)
-			}
-
-			// Mark this function as having finished executing.
-			// This is important so the runtime knows the exported function
-			// didn't block.
-			doneGEP := b.CreateInBoundsGEP(stateStruct, statePtr, []llvm.Value{
-				llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-				llvm.ConstInt(c.ctx.Int32Type(), uint64(numParams), false),
-			}, "done.gep")
-			b.CreateStore(llvm.ConstInt(b.ctx.Int1Type(), 1, false), doneGEP)
-
-			// Call back into the runtime. This will exit the goroutine, switch
-			// back to the scheduler, which will in turn return from the
-			// //go:wasmexport function.
-			b.createRuntimeCall("wasmExportExit", nil, "")
+		if c.Scheduler == "asyncify" {
+			builder.CreateCall(deadlock, []llvm.Value{
+				llvm.Undef(c.i8ptrType),
+			}, "")
 		}

 	} else {
@@ -470,14 +229,14 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 		// merged into one.

 		// Create the wrapper.
-		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType}, false)
+		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.i8ptrType}, false)
 		wrapper = llvm.AddFunction(c.mod, prefix+".gowrapper", wrapperType)
 		c.addStandardAttributes(wrapper)
 		wrapper.SetLinkage(llvm.LinkOnceODRLinkage)
 		wrapper.SetUnnamedAddr(true)
 		wrapper.AddAttributeAtIndex(-1, c.ctx.CreateStringAttribute("tinygo-gowrapper", ""))
 		entry := c.ctx.AddBasicBlock(wrapper, "entry")
-		b.SetInsertPointAtEnd(entry)
+		builder.SetInsertPointAtEnd(entry)

 		if c.Debug {
 			pos := c.program.Fset.Position(pos)
@@ -498,37 +257,37 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 				Optimized:    true,
 			})
 			wrapper.SetSubprogram(difunc)
-			b.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), difunc, llvm.Metadata{})
+			builder.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), difunc, llvm.Metadata{})
 		}

 		// Get the list of parameters, with the extra parameters at the end.
-		paramTypes := fnType.ParamTypes()
+		paramTypes := fn.Type().ElementType().ParamTypes()
 		paramTypes = append(paramTypes, fn.Type()) // the last element is the function pointer
-		params := b.emitPointerUnpack(wrapper.Param(0), paramTypes)
+		params := llvmutil.EmitPointerUnpack(builder, c.mod, wrapper.Param(0), paramTypes)

 		// Get the function pointer.
 		fnPtr := params[len(params)-1]
 		params = params[:len(params)-1]

 		// Create the call.
-		b.CreateCall(fnType, fnPtr, params, "")
+		builder.CreateCall(fnPtr, params, "")

 		if c.Scheduler == "asyncify" {
-			b.CreateCall(deadlockType, deadlock, []llvm.Value{
-				llvm.Undef(c.dataPtrType),
+			builder.CreateCall(deadlock, []llvm.Value{
+				llvm.Undef(c.i8ptrType),
 			}, "")
 		}
 	}

 	if c.Scheduler == "asyncify" {
 		// The goroutine was terminated via deadlock.
-		b.CreateUnreachable()
+		builder.CreateUnreachable()
 	} else {
 		// Finish the function. Every basic block must end in a terminator, and
 		// because goroutines never return a value we can simply return void.
-		b.CreateRetVoid()
+		builder.CreateRetVoid()
 	}

 	// Return a ptrtoint of the wrapper, not the function itself.
-	return llvm.ConstPtrToInt(wrapper, c.uintptrType)
+	return builder.CreatePtrToInt(wrapper, c.uintptrType, "")
 }
@@ -5,7 +5,6 @@ package compiler
 import (
 	"fmt"
 	"go/constant"
-	"go/token"
 	"regexp"
 	"strconv"
 	"strings"
@@ -26,7 +25,7 @@ func (b *builder) createInlineAsm(args []ssa.Value) (llvm.Value, error) {
 	fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{}, false)
 	asm := constant.StringVal(args[0].(*ssa.Const).Value)
 	target := llvm.InlineAsm(fnType, asm, "", true, false, 0, false)
-	return b.CreateCall(fnType, target, nil, ""), nil
+	return b.CreateCall(target, nil, ""), nil
 }

 // This is a compiler builtin, which allows assembly to be called in a flexible
@@ -56,7 +55,7 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
 					return llvm.Value{}, b.makeError(instr.Pos(), "register value map must be created in the same basic block")
 				}
 				key := constant.StringVal(r.Key.(*ssa.Const).Value)
-				registers[key] = b.getValue(r.Value.(*ssa.MakeInterface).X, getPos(instr))
+				registers[key] = b.getValue(r.Value.(*ssa.MakeInterface).X)
 			case *ssa.Call:
 				if r.Common() == instr {
 					break
@@ -99,8 +98,8 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
 			case llvm.IntegerTypeKind:
 				constraints = append(constraints, "r")
 			case llvm.PointerTypeKind:
-				// Memory references require a type starting with LLVM 14,
-				// probably as a preparation for opaque pointers.
+				// Memory references require a type in LLVM 14, probably as a
+				// preparation for opaque pointers.
 				err = b.makeError(instr.Pos(), "support for pointer operands was dropped in TinyGo 0.23")
 				return s
 			default:
@@ -121,7 +120,7 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
 	}
 	fnType := llvm.FunctionType(outputType, argTypes, false)
 	target := llvm.InlineAsm(fnType, asmString, strings.Join(constraints, ","), true, false, 0, false)
-	result := b.CreateCall(fnType, target, args, "")
+	result := b.CreateCall(target, args, "")
 	if hasOutput {
 		return result, nil
 	} else {
@@ -141,7 +140,7 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
 //
 // The num parameter must be a constant. All other parameters may be any scalar
 // value supported by LLVM inline assembly.
-func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error) {
+func (b *builder) emitSVCall(args []ssa.Value) (llvm.Value, error) {
 	num, _ := constant.Uint64Val(args[0].(*ssa.Const).Value)
 	llvmArgs := []llvm.Value{}
 	argTypes := []llvm.Type{}
@@ -154,7 +153,7 @@ func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error
 		} else {
 			constraints += ",{r" + strconv.Itoa(i) + "}"
 		}
-		llvmValue := b.getValue(arg, pos)
+		llvmValue := b.getValue(arg)
 		llvmArgs = append(llvmArgs, llvmValue)
 		argTypes = append(argTypes, llvmValue.Type())
 	}
@@ -164,7 +163,7 @@ func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error
 	constraints += ",~{r1},~{r2},~{r3}"
 	fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 	target := llvm.InlineAsm(fnType, asm, constraints, true, false, 0, false)
-	return b.CreateCall(fnType, target, llvmArgs, ""), nil
+	return b.CreateCall(target, llvmArgs, ""), nil
 }

 // This is a compiler builtin which emits an inline SVCall instruction. It can
@@ -179,7 +178,7 @@ func (b *builder) emitSVCall(args []ssa.Value, pos token.Pos) (llvm.Value, error
 // The num parameter must be a constant. All other parameters may be any scalar
 // value supported by LLVM inline assembly.
 // Same as emitSVCall but for AArch64
-func (b *builder) emitSV64Call(args []ssa.Value, pos token.Pos) (llvm.Value, error) {
+func (b *builder) emitSV64Call(args []ssa.Value) (llvm.Value, error) {
 	num, _ := constant.Uint64Val(args[0].(*ssa.Const).Value)
 	llvmArgs := []llvm.Value{}
 	argTypes := []llvm.Type{}
@@ -192,7 +191,7 @@ func (b *builder) emitSV64Call(args []ssa.Value, pos token.Pos) (llvm.Value, err
 		} else {
 			constraints += ",{x" + strconv.Itoa(i) + "}"
 		}
-		llvmValue := b.getValue(arg, pos)
+		llvmValue := b.getValue(arg)
 		llvmArgs = append(llvmArgs, llvmValue)
 		argTypes = append(argTypes, llvmValue.Type())
 	}
@@ -202,7 +201,7 @@ func (b *builder) emitSV64Call(args []ssa.Value, pos token.Pos) (llvm.Value, err
 	constraints += ",~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7}"
 	fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
 	target := llvm.InlineAsm(fnType, asm, constraints, true, false, 0, false)
-	return b.CreateCall(fnType, target, llvmArgs, ""), nil
+	return b.CreateCall(target, llvmArgs, ""), nil
 }

 // This is a compiler builtin which emits CSR instructions. It can be one of:
@@ -227,24 +226,24 @@ func (b *builder) emitCSROperation(call *ssa.CallCommon) (llvm.Value, error) {
 		fnType := llvm.FunctionType(b.uintptrType, nil, false)
 		asm := fmt.Sprintf("csrr $0, %d", csr)
 		target := llvm.InlineAsm(fnType, asm, "=r", true, false, 0, false)
-		return b.CreateCall(fnType, target, nil, ""), nil
+		return b.CreateCall(target, nil, ""), nil
 	case "Set":
 		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.uintptrType}, false)
 		asm := fmt.Sprintf("csrw %d, $0", csr)
 		target := llvm.InlineAsm(fnType, asm, "r", true, false, 0, false)
-		return b.CreateCall(fnType, target, []llvm.Value{b.getValue(call.Args[1], getPos(call))}, ""), nil
+		return b.CreateCall(target, []llvm.Value{b.getValue(call.Args[1])}, ""), nil
 	case "SetBits":
 		// Note: it may be possible to optimize this to csrrsi in many cases.
 		fnType := llvm.FunctionType(b.uintptrType, []llvm.Type{b.uintptrType}, false)
 		asm := fmt.Sprintf("csrrs $0, %d, $1", csr)
 		target := llvm.InlineAsm(fnType, asm, "=r,r", true, false, 0, false)
-		return b.CreateCall(fnType, target, []llvm.Value{b.getValue(call.Args[1], getPos(call))}, ""), nil
+		return b.CreateCall(target, []llvm.Value{b.getValue(call.Args[1])}, ""), nil
 	case "ClearBits":
 		// Note: it may be possible to optimize this to csrrci in many cases.
 		fnType := llvm.FunctionType(b.uintptrType, []llvm.Type{b.uintptrType}, false)
 		asm := fmt.Sprintf("csrrc $0, %d, $1", csr)
 		target := llvm.InlineAsm(fnType, asm, "=r,r", true, false, 0, false)
-		return b.CreateCall(fnType, target, []llvm.Value{b.getValue(call.Args[1], getPos(call))}, ""), nil
+		return b.CreateCall(target, []llvm.Value{b.getValue(call.Args[1])}, ""), nil
 	default:
 		return llvm.Value{}, b.makeError(call.Pos(), "unknown CSR operation: "+name)
 	}
@@ -6,8 +6,6 @@ package compiler
 // interface-lowering.go for more details.

 import (
-	"encoding/binary"
-	"fmt"
 	"go/token"
 	"go/types"
 	"strconv"
@@ -17,58 +15,6 @@ import (
 	"tinygo.org/x/go-llvm"
 )

-// Type kinds for basic types.
-// They must match the constants for the Kind type in src/reflect/type.go.
-var basicTypes = [...]uint8{
-	types.Bool:          1,
-	types.Int:           2,
-	types.Int8:          3,
-	types.Int16:         4,
-	types.Int32:         5,
-	types.Int64:         6,
-	types.Uint:          7,
-	types.Uint8:         8,
-	types.Uint16:        9,
-	types.Uint32:        10,
-	types.Uint64:        11,
-	types.Uintptr:       12,
-	types.Float32:       13,
-	types.Float64:       14,
-	types.Complex64:     15,
-	types.Complex128:    16,
-	types.String:        17,
-	types.UnsafePointer: 18,
-}
-
-// These must also match the constants for the Kind type in src/reflect/type.go.
-const (
-	typeKindChan      = 19
-	typeKindInterface = 20
-	typeKindPointer   = 21
-	typeKindSlice     = 22
-	typeKindArray     = 23
-	typeKindSignature = 24
-	typeKindMap       = 25
-	typeKindStruct    = 26
-)
-
-// Flags stored in the first byte of the struct field byte array. Must be kept
-// up to date with src/reflect/type.go.
-const (
-	structFieldFlagAnonymous = 1 << iota
-	structFieldFlagHasTag
-	structFieldFlagIsExported
-	structFieldFlagIsEmbedded
-)
-
-type reflectChanDir int
-
-const (
-	refRecvDir reflectChanDir            = 1 << iota // <-chan
-	refSendDir                                       // chan<-
-	refBothDir = refRecvDir | refSendDir             // chan
-)
-
 // createMakeInterface emits the LLVM IR for the *ssa.MakeInterface instruction.
 // It tries to put the type in the interface value, but if that's not possible,
 // it will do an allocation of the right size and put that in the interface
@@ -77,417 +23,136 @@ const (
 // An interface value is a {typecode, value} tuple named runtime._interface.
 func (b *builder) createMakeInterface(val llvm.Value, typ types.Type, pos token.Pos) llvm.Value {
 	itfValue := b.emitPointerPack([]llvm.Value{val})
-	itfType := b.getTypeCode(typ)
+	itfTypeCodeGlobal := b.getTypeCode(typ)
+	itfTypeCode := b.CreatePtrToInt(itfTypeCodeGlobal, b.uintptrType, "")
 	itf := llvm.Undef(b.getLLVMRuntimeType("_interface"))
-	itf = b.CreateInsertValue(itf, itfType, 0, "")
+	itf = b.CreateInsertValue(itf, itfTypeCode, 0, "")
 	itf = b.CreateInsertValue(itf, itfValue, 1, "")
 	return itf
 }

 // extractValueFromInterface extract the value from an interface value
 // (runtime._interface) under the assumption that it is of the type given in
-// llvmType. The behavior is undefined if the interface is nil or llvmType
+// llvmType. The behavior is undefied if the interface is nil or llvmType
 // doesn't match the underlying type of the interface.
 func (b *builder) extractValueFromInterface(itf llvm.Value, llvmType llvm.Type) llvm.Value {
 	valuePtr := b.CreateExtractValue(itf, 1, "typeassert.value.ptr")
 	return b.emitPointerUnpack(valuePtr, []llvm.Type{llvmType})[0]
 }

-func (c *compilerContext) pkgPathPtr(pkgpath string) llvm.Value {
-	pkgpathName := "reflect/types.type.pkgpath.empty"
-	if pkgpath != "" {
-		pkgpathName = "reflect/types.type.pkgpath:" + pkgpath
-	}
-
-	pkgpathGlobal := c.mod.NamedGlobal(pkgpathName)
-	if pkgpathGlobal.IsNil() {
-		pkgpathInitializer := c.ctx.ConstString(pkgpath+"\x00", false)
-		pkgpathGlobal = llvm.AddGlobal(c.mod, pkgpathInitializer.Type(), pkgpathName)
-		pkgpathGlobal.SetInitializer(pkgpathInitializer)
-		pkgpathGlobal.SetAlignment(1)
-		pkgpathGlobal.SetUnnamedAddr(true)
-		pkgpathGlobal.SetLinkage(llvm.LinkOnceODRLinkage)
-		pkgpathGlobal.SetGlobalConstant(true)
-	}
-	pkgPathPtr := llvm.ConstGEP(pkgpathGlobal.GlobalValueType(), pkgpathGlobal, []llvm.Value{
-		llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-		llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-	})
-
-	return pkgPathPtr
-}
-
 // getTypeCode returns a reference to a type code.
-// A type code is a pointer to a constant global that describes the type.
-// This function returns a pointer to the 'kind' field (which might not be the
-// first field in the struct).
+// It returns a pointer to an external global which should be replaced with the
+// real type in the interface lowering pass.
 func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
-	ms := c.program.MethodSets.MethodSet(typ)
-	hasMethodSet := ms.Len() != 0
-	_, isInterface := typ.Underlying().(*types.Interface)
-	if isInterface {
-		hasMethodSet = false
-	}
-
-	// As defined in https://pkg.go.dev/reflect#Type:
-	// NumMethod returns the number of methods accessible using Method.
-	// For a non-interface type, it returns the number of exported methods.
-	// For an interface type, it returns the number of exported and unexported methods.
-	var numMethods int
-	for i := 0; i < ms.Len(); i++ {
-		if isInterface || ms.At(i).Obj().Exported() {
-			numMethods++
-		}
-	}
-
-	// Short-circuit all the global pointer logic here for pointers to pointers.
-	if typ, ok := typ.(*types.Pointer); ok {
-		if _, ok := typ.Elem().(*types.Pointer); ok {
-			// For a pointer to a pointer, we just increase the pointer by 1
-			ptr := c.getTypeCode(typ.Elem())
-			// if the type is already *****T or higher, we can't make it.
-			if typstr := typ.String(); strings.HasPrefix(typstr, "*****") {
-				c.addError(token.NoPos, fmt.Sprintf("too many levels of pointers for typecode: %s", typstr))
-			}
-			return llvm.ConstGEP(c.ctx.Int8Type(), ptr, []llvm.Value{
-				llvm.ConstInt(c.ctx.Int32Type(), 1, false),
-			})
-		}
-	}
-
-	typeCodeName, isLocal := getTypeCodeName(typ)
-	globalName := "reflect/types.type:" + typeCodeName
-	var global llvm.Value
-	if isLocal {
-		// This type is a named type inside a function, like this:
-		//
-		//     func foo() any {
-		//         type named int
-		//         return named(0)
-		//     }
-		if obj := c.interfaceTypes.At(typ); obj != nil {
-			global = obj.(llvm.Value)
-		}
-	} else {
-		// Regular type (named or otherwise).
-		global = c.mod.NamedGlobal(globalName)
-	}
+	globalName := "reflect/types.type:" + getTypeCodeName(typ)
+	global := c.mod.NamedGlobal(globalName)
 	if global.IsNil() {
-		var typeFields []llvm.Value
-		// Define the type fields. These must match the structs in
-		// src/reflect/type.go (ptrType, arrayType, etc). See the comment at the
-		// top of src/reflect/type.go for more information on the layout of these structs.
-		typeFieldTypes := []*types.Var{
-			types.NewVar(token.NoPos, nil, "kind", types.Typ[types.Int8]),
-		}
+		// Create a new typecode global.
+		global = llvm.AddGlobal(c.mod, c.getLLVMRuntimeType("typecodeID"), globalName)
+		// Some type classes contain more information for underlying types or
+		// element types. Store it directly in the typecode global to make
+		// reflect lowering simpler.
+		var references llvm.Value
+		var length int64
+		var methodSet llvm.Value
+		var ptrTo llvm.Value
+		var typeAssert llvm.Value
 		switch typ := typ.(type) {
-		case *types.Basic:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-			)
 		case *types.Named:
-			name := typ.Obj().Name()
-			var pkgname string
-			if pkg := typ.Obj().Pkg(); pkg != nil {
-				pkgname = pkg.Name()
-			}
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "underlying", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "pkgpath", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "name", types.NewArray(types.Typ[types.Int8], int64(len(pkgname)+1+len(name)+1))),
-			)
+			references = c.getTypeCode(typ.Underlying())
 		case *types.Chan:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]), // reuse for select chan direction
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
-			)
-		case *types.Slice:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
-			)
+			references = c.getTypeCode(typ.Elem())
 		case *types.Pointer:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
-			)
-		case *types.Array:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "length", types.Typ[types.Uintptr]),
-				types.NewVar(token.NoPos, nil, "sliceOf", types.Typ[types.UnsafePointer]),
-			)
-		case *types.Map:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "keyType", types.Typ[types.UnsafePointer]),
-			)
-		case *types.Struct:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "pkgpath", types.Typ[types.UnsafePointer]),
-				types.NewVar(token.NoPos, nil, "size", types.Typ[types.Uint32]),
-				types.NewVar(token.NoPos, nil, "numFields", types.Typ[types.Uint16]),
-				types.NewVar(token.NoPos, nil, "fields", types.NewArray(c.getRuntimeType("structField"), int64(typ.NumFields()))),
-			)
-		case *types.Interface:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-			)
-			// TODO: methods
-		case *types.Signature:
-			typeFieldTypes = append(typeFieldTypes,
-				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
-			)
-			// TODO: signature params and return values
-		}
-		if hasMethodSet {
-			// This method set is appended at the start of the struct. It is
-			// removed in the interface lowering pass.
-			// TODO: don't remove these and instead do what upstream Go is doing
-			// instead. See: https://research.swtch.com/interfaces. This can
-			// likely be optimized in LLVM using
-			// https://llvm.org/docs/TypeMetadata.html.
-			typeFieldTypes = append([]*types.Var{
-				types.NewVar(token.NoPos, nil, "methodSet", types.Typ[types.UnsafePointer]),
-			}, typeFieldTypes...)
-		}
-		globalType := types.NewStruct(typeFieldTypes, nil)
-		global = llvm.AddGlobal(c.mod, c.getLLVMType(globalType), globalName)
-		if isLocal {
-			c.interfaceTypes.Set(typ, global)
-		}
-		metabyte := getTypeKind(typ)
-
-		// Precompute these so we don't have to calculate them at runtime.
-		if types.Comparable(typ) {
-			metabyte |= 1 << 6
-		}
-
-		if hashmapIsBinaryKey(typ) {
-			metabyte |= 1 << 7
-		}
-
-		switch typ := typ.(type) {
-		case *types.Basic:
-			typeFields = []llvm.Value{c.getTypeCode(types.NewPointer(typ))}
-		case *types.Named:
-			name := typ.Obj().Name()
-			var pkgpath string
-			var pkgname string
-			if pkg := typ.Obj().Pkg(); pkg != nil {
-				pkgpath = pkg.Path()
-				pkgname = pkg.Name()
-			}
-			pkgPathPtr := c.pkgPathPtr(pkgpath)
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),                        // ptrTo
-				c.getTypeCode(typ.Underlying()),                             // underlying
-				pkgPathPtr,                                                  // pkgpath pointer
-				c.ctx.ConstString(pkgname+"."+name+"\x00", false),           // name
-			}
-			metabyte |= 1 << 5 // "named" flag
-		case *types.Chan:
-			var dir reflectChanDir
-			switch typ.Dir() {
-			case types.SendRecv:
-				dir = refBothDir
-			case types.RecvOnly:
-				dir = refRecvDir
-			case types.SendOnly:
-				dir = refSendDir
-			}
-
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(dir), false), // actually channel direction
-				c.getTypeCode(types.NewPointer(typ)),                 // ptrTo
-				c.getTypeCode(typ.Elem()),                            // elementType
-			}
+			references = c.getTypeCode(typ.Elem())
 		case *types.Slice:
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), 0, false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),       // ptrTo
-				c.getTypeCode(typ.Elem()),                  // elementType
-			}
-		case *types.Pointer:
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
-				c.getTypeCode(typ.Elem()),
-			}
+			references = c.getTypeCode(typ.Elem())
 		case *types.Array:
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), 0, false),             // numMethods
-				c.getTypeCode(types.NewPointer(typ)),                   // ptrTo
-				c.getTypeCode(typ.Elem()),                              // elementType
-				llvm.ConstInt(c.uintptrType, uint64(typ.Len()), false), // length
-				c.getTypeCode(types.NewSlice(typ.Elem())),              // slicePtr
-			}
-		case *types.Map:
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), 0, false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),       // ptrTo
-				c.getTypeCode(typ.Elem()),                  // elem
-				c.getTypeCode(typ.Key()),                   // key
-			}
+			references = c.getTypeCode(typ.Elem())
+			length = typ.Len()
 		case *types.Struct:
-			var pkgpath string
-			if typ.NumFields() > 0 {
-				if pkg := typ.Field(0).Pkg(); pkg != nil {
-					pkgpath = pkg.Path()
-				}
-			}
-			pkgPathPtr := c.pkgPathPtr(pkgpath)
-
-			llvmStructType := c.getLLVMType(typ)
-			size := c.targetData.TypeStoreSize(llvmStructType)
-			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),                        // ptrTo
-				pkgPathPtr,
-				llvm.ConstInt(c.ctx.Int32Type(), uint64(size), false),            // size
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(typ.NumFields()), false), // numFields
-			}
-			structFieldType := c.getLLVMRuntimeType("structField")
-
-			var fields []llvm.Value
-			for i := 0; i < typ.NumFields(); i++ {
-				field := typ.Field(i)
-				offset := c.targetData.ElementOffset(llvmStructType, i)
-				var flags uint8
-				if field.Anonymous() {
-					flags |= structFieldFlagAnonymous
-				}
-				if typ.Tag(i) != "" {
-					flags |= structFieldFlagHasTag
-				}
-				if token.IsExported(field.Name()) {
-					flags |= structFieldFlagIsExported
-				}
-				if field.Embedded() {
-					flags |= structFieldFlagIsEmbedded
-				}
-
-				var offsBytes [binary.MaxVarintLen32]byte
-				offLen := binary.PutUvarint(offsBytes[:], offset)
-
-				data := string(flags) + string(offsBytes[:offLen]) + field.Name() + "\x00"
-				if typ.Tag(i) != "" {
-					if len(typ.Tag(i)) > 0xff {
-						c.addError(field.Pos(), fmt.Sprintf("struct tag is %d bytes which is too long, max is 255", len(typ.Tag(i))))
-					}
-					data += string([]byte{byte(len(typ.Tag(i)))}) + typ.Tag(i)
-				}
-				dataInitializer := c.ctx.ConstString(data, false)
-				dataGlobal := llvm.AddGlobal(c.mod, dataInitializer.Type(), globalName+"."+field.Name())
-				dataGlobal.SetInitializer(dataInitializer)
-				dataGlobal.SetAlignment(1)
-				dataGlobal.SetUnnamedAddr(true)
-				dataGlobal.SetLinkage(llvm.InternalLinkage)
-				dataGlobal.SetGlobalConstant(true)
-				fieldType := c.getTypeCode(field.Type())
-				fields = append(fields, llvm.ConstNamedStruct(structFieldType, []llvm.Value{
-					fieldType,
-					llvm.ConstGEP(dataGlobal.GlobalValueType(), dataGlobal, []llvm.Value{
-						llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-						llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-					}),
-				}))
-			}
-			typeFields = append(typeFields, llvm.ConstArray(structFieldType, fields))
+			// Take a pointer to the typecodeID of the first field (if it exists).
+			structGlobal := c.makeStructTypeFields(typ)
+			references = llvm.ConstBitCast(structGlobal, global.Type())
 		case *types.Interface:
-			typeFields = []llvm.Value{c.getTypeCode(types.NewPointer(typ))}
-			// TODO: methods
-		case *types.Signature:
-			typeFields = []llvm.Value{c.getTypeCode(types.NewPointer(typ))}
-			// TODO: params, return values, etc
+			methodSetGlobal := c.getInterfaceMethodSet(typ)
+			references = llvm.ConstBitCast(methodSetGlobal, global.Type())
 		}
-		// Prepend metadata byte.
-		typeFields = append([]llvm.Value{
-			llvm.ConstInt(c.ctx.Int8Type(), uint64(metabyte), false),
-		}, typeFields...)
-		if hasMethodSet {
-			typeFields = append([]llvm.Value{
-				c.getTypeMethodSet(typ),
-			}, typeFields...)
-		}
-		alignment := c.targetData.TypeAllocSize(c.dataPtrType)
-		if alignment < 4 {
-			alignment = 4
-		}
-		globalValue := c.ctx.ConstStruct(typeFields, false)
-		global.SetInitializer(globalValue)
-		if isLocal {
-			global.SetLinkage(llvm.InternalLinkage)
+		if _, ok := typ.Underlying().(*types.Interface); !ok {
+			methodSet = c.getTypeMethodSet(typ)
 		} else {
-			global.SetLinkage(llvm.LinkOnceODRLinkage)
+			typeAssert = c.getInterfaceImplementsFunc(typ)
+			typeAssert = llvm.ConstPtrToInt(typeAssert, c.uintptrType)
 		}
+		if _, ok := typ.Underlying().(*types.Pointer); !ok {
+			ptrTo = c.getTypeCode(types.NewPointer(typ))
+		}
+		globalValue := llvm.ConstNull(global.Type().ElementType())
+		if !references.IsNil() {
+			globalValue = llvm.ConstInsertValue(globalValue, references, []uint32{0})
+		}
+		if length != 0 {
+			lengthValue := llvm.ConstInt(c.uintptrType, uint64(length), false)
+			globalValue = llvm.ConstInsertValue(globalValue, lengthValue, []uint32{1})
+		}
+		if !methodSet.IsNil() {
+			globalValue = llvm.ConstInsertValue(globalValue, methodSet, []uint32{2})
+		}
+		if !ptrTo.IsNil() {
+			globalValue = llvm.ConstInsertValue(globalValue, ptrTo, []uint32{3})
+		}
+		if !typeAssert.IsNil() {
+			globalValue = llvm.ConstInsertValue(globalValue, typeAssert, []uint32{4})
+		}
+		global.SetInitializer(globalValue)
+		global.SetLinkage(llvm.LinkOnceODRLinkage)
 		global.SetGlobalConstant(true)
-		global.SetAlignment(int(alignment))
-		if c.Debug {
-			file := c.getDIFile("<Go type>")
-			diglobal := c.dibuilder.CreateGlobalVariableExpression(file, llvm.DIGlobalVariableExpression{
-				Name:        "type " + typ.String(),
-				File:        file,
-				Line:        1,
-				Type:        c.getDIType(globalType),
-				LocalToUnit: false,
-				Expr:        c.dibuilder.CreateExpression(nil),
-				AlignInBits: uint32(alignment * 8),
+	}
+	return global
+}
+
+// makeStructTypeFields creates a new global that stores all type information
+// related to this struct type, and returns the resulting global. This global is
+// actually an array of all the fields in the structs.
+func (c *compilerContext) makeStructTypeFields(typ *types.Struct) llvm.Value {
+	// The global is an array of runtime.structField structs.
+	runtimeStructField := c.getLLVMRuntimeType("structField")
+	structGlobalType := llvm.ArrayType(runtimeStructField, typ.NumFields())
+	structGlobal := llvm.AddGlobal(c.mod, structGlobalType, "reflect/types.structFields")
+	structGlobalValue := llvm.ConstNull(structGlobalType)
+	for i := 0; i < typ.NumFields(); i++ {
+		fieldGlobalValue := llvm.ConstNull(runtimeStructField)
+		fieldGlobalValue = llvm.ConstInsertValue(fieldGlobalValue, c.getTypeCode(typ.Field(i).Type()), []uint32{0})
+		fieldName := c.makeGlobalArray([]byte(typ.Field(i).Name()), "reflect/types.structFieldName", c.ctx.Int8Type())
+		fieldName.SetLinkage(llvm.PrivateLinkage)
+		fieldName.SetUnnamedAddr(true)
+		fieldName = llvm.ConstGEP(fieldName, []llvm.Value{
+			llvm.ConstInt(c.ctx.Int32Type(), 0, false),
+			llvm.ConstInt(c.ctx.Int32Type(), 0, false),
+		})
+		fieldGlobalValue = llvm.ConstInsertValue(fieldGlobalValue, fieldName, []uint32{1})
+		if typ.Tag(i) != "" {
+			fieldTag := c.makeGlobalArray([]byte(typ.Tag(i)), "reflect/types.structFieldTag", c.ctx.Int8Type())
+			fieldTag.SetLinkage(llvm.PrivateLinkage)
+			fieldTag.SetUnnamedAddr(true)
+			fieldTag = llvm.ConstGEP(fieldTag, []llvm.Value{
+				llvm.ConstInt(c.ctx.Int32Type(), 0, false),
+				llvm.ConstInt(c.ctx.Int32Type(), 0, false),
 			})
-			global.AddMetadata(0, diglobal)
+			fieldGlobalValue = llvm.ConstInsertValue(fieldGlobalValue, fieldTag, []uint32{2})
 		}
+		if typ.Field(i).Embedded() {
+			fieldEmbedded := llvm.ConstInt(c.ctx.Int1Type(), 1, false)
+			fieldGlobalValue = llvm.ConstInsertValue(fieldGlobalValue, fieldEmbedded, []uint32{3})
+		}
+		structGlobalValue = llvm.ConstInsertValue(structGlobalValue, fieldGlobalValue, []uint32{uint32(i)})
 	}
-	offset := uint64(0)
-	if hasMethodSet {
-		// The pointer to the method set is always the first element of the
-		// global (if there is a method set). However, the pointer we return
-		// should point to the 'kind' field not the method set.
-		offset = 1
-	}
-	return llvm.ConstGEP(global.GlobalValueType(), global, []llvm.Value{
-		llvm.ConstInt(c.ctx.Int32Type(), 0, false),
-		llvm.ConstInt(c.ctx.Int32Type(), offset, false),
-	})
+	structGlobal.SetInitializer(structGlobalValue)
+	structGlobal.SetUnnamedAddr(true)
+	structGlobal.SetLinkage(llvm.PrivateLinkage)
+	return structGlobal
 }

-// getTypeKind returns the type kind for the given type, as defined by
-// reflect.Kind.
-func getTypeKind(t types.Type) uint8 {
-	switch t := t.Underlying().(type) {
-	case *types.Basic:
-		return basicTypes[t.Kind()]
-	case *types.Chan:
-		return typeKindChan
-	case *types.Interface:
-		return typeKindInterface
-	case *types.Pointer:
-		return typeKindPointer
-	case *types.Slice:
-		return typeKindSlice
-	case *types.Array:
-		return typeKindArray
-	case *types.Signature:
-		return typeKindSignature
-	case *types.Map:
-		return typeKindMap
-	case *types.Struct:
-		return typeKindStruct
-	default:
-		panic("unknown type")
-	}
-}
-
-var basicTypeNames = [...]string{
+var basicTypes = [...]string{
 	types.Bool:          "bool",
 	types.Int:           "int",
 	types.Int8:          "int8",
@@ -511,93 +176,57 @@ var basicTypeNames = [...]string{
 // getTypeCodeName returns a name for this type that can be used in the
 // interface lowering pass to assign type codes as expected by the reflect
 // package. See getTypeCodeNum.
-func getTypeCodeName(t types.Type) (string, bool) {
+func getTypeCodeName(t types.Type) string {
 	switch t := t.(type) {
 	case *types.Named:
-		if t.Obj().Parent() != t.Obj().Pkg().Scope() {
-			return "named:" + t.String() + "$local", true
-		}
-		return "named:" + t.String(), false
+		return "named:" + t.String()
 	case *types.Array:
-		s, isLocal := getTypeCodeName(t.Elem())
-		return "array:" + strconv.FormatInt(t.Len(), 10) + ":" + s, isLocal
+		return "array:" + strconv.FormatInt(t.Len(), 10) + ":" + getTypeCodeName(t.Elem())
 	case *types.Basic:
-		return "basic:" + basicTypeNames[t.Kind()], false
+		return "basic:" + basicTypes[t.Kind()]
 	case *types.Chan:
-		s, isLocal := getTypeCodeName(t.Elem())
-		var dir string
-		switch t.Dir() {
-		case types.SendOnly:
-			dir = "s:"
-		case types.RecvOnly:
-			dir = "r:"
-		case types.SendRecv:
-			dir = "sr:"
-		}
-
-		return "chan:" + dir + s, isLocal
+		return "chan:" + getTypeCodeName(t.Elem())
 	case *types.Interface:
-		isLocal := false
 		methods := make([]string, t.NumMethods())
 		for i := 0; i < t.NumMethods(); i++ {
 			name := t.Method(i).Name()
 			if !token.IsExported(name) {
 				name = t.Method(i).Pkg().Path() + "." + name
 			}
-			s, local := getTypeCodeName(t.Method(i).Type())
-			if local {
-				isLocal = true
-			}
-			methods[i] = name + ":" + s
+			methods[i] = name + ":" + getTypeCodeName(t.Method(i).Type())
 		}
-		return "interface:" + "{" + strings.Join(methods, ",") + "}", isLocal
+		return "interface:" + "{" + strings.Join(methods, ",") + "}"
 	case *types.Map:
-		keyType, keyLocal := getTypeCodeName(t.Key())
-		elemType, elemLocal := getTypeCodeName(t.Elem())
-		return "map:" + "{" + keyType + "," + elemType + "}", keyLocal || elemLocal
+		keyType := getTypeCodeName(t.Key())
+		elemType := getTypeCodeName(t.Elem())
+		return "map:" + "{" + keyType + "," + elemType + "}"
 	case *types.Pointer:
-		s, isLocal := getTypeCodeName(t.Elem())
-		return "pointer:" + s, isLocal
+		return "pointer:" + getTypeCodeName(t.Elem())
 	case *types.Signature:
-		isLocal := false
 		params := make([]string, t.Params().Len())
 		for i := 0; i < t.Params().Len(); i++ {
-			s, local := getTypeCodeName(t.Params().At(i).Type())
-			if local {
-				isLocal = true
-			}
-			params[i] = s
+			params[i] = getTypeCodeName(t.Params().At(i).Type())
 		}
 		results := make([]string, t.Results().Len())
 		for i := 0; i < t.Results().Len(); i++ {
-			s, local := getTypeCodeName(t.Results().At(i).Type())
-			if local {
-				isLocal = true
-			}
-			results[i] = s
+			results[i] = getTypeCodeName(t.Results().At(i).Type())
 		}
-		return "func:" + "{" + strings.Join(params, ",") + "}{" + strings.Join(results, ",") + "}", isLocal
+		return "func:" + "{" + strings.Join(params, ",") + "}{" + strings.Join(results, ",") + "}"
 	case *types.Slice:
-		s, isLocal := getTypeCodeName(t.Elem())
-		return "slice:" + s, isLocal
+		return "slice:" + getTypeCodeName(t.Elem())
 	case *types.Struct:
 		elems := make([]string, t.NumFields())
-		isLocal := false
 		for i := 0; i < t.NumFields(); i++ {
 			embedded := ""
 			if t.Field(i).Embedded() {
 				embedded = "#"
 			}
-			s, local := getTypeCodeName(t.Field(i).Type())
-			if local {
-				isLocal = true
-			}
-			elems[i] = embedded + t.Field(i).Name() + ":" + s
+			elems[i] = embedded + t.Field(i).Name() + ":" + getTypeCodeName(t.Field(i).Type())
 			if t.Tag(i) != "" {
 				elems[i] += "`" + t.Tag(i) + "`"
 			}
 		}
-		return "struct:" + "{" + strings.Join(elems, ",") + "}", isLocal
+		return "struct:" + "{" + strings.Join(elems, ",") + "}"
 	default:
 		panic("unknown type: " + t.String())
 	}
@@ -606,40 +235,75 @@ func getTypeCodeName(t types.Type) (string, bool) {
 // getTypeMethodSet returns a reference (GEP) to a global method set. This
 // method set should be unreferenced after the interface lowering pass.
 func (c *compilerContext) getTypeMethodSet(typ types.Type) llvm.Value {
-	globalName := typ.String() + "$methodset"
-	global := c.mod.NamedGlobal(globalName)
-	if global.IsNil() {
-		ms := c.program.MethodSets.MethodSet(typ)
-
-		// Create method set.
-		var signatures, wrappers []llvm.Value
-		for i := 0; i < ms.Len(); i++ {
-			method := ms.At(i)
-			signatureGlobal := c.getMethodSignature(method.Obj().(*types.Func))
-			signatures = append(signatures, signatureGlobal)
-			fn := c.program.MethodValue(method)
-			llvmFnType, llvmFn := c.getFunction(fn)
-			if llvmFn.IsNil() {
-				// compiler error, so panic
-				panic("cannot find function: " + c.getFunctionInfo(fn).linkName)
-			}
-			wrapper := c.getInterfaceInvokeWrapper(fn, llvmFnType, llvmFn)
-			wrappers = append(wrappers, wrapper)
-		}
-
-		// Construct global value.
-		globalValue := c.ctx.ConstStruct([]llvm.Value{
-			llvm.ConstInt(c.uintptrType, uint64(ms.Len()), false),
-			llvm.ConstArray(c.dataPtrType, signatures),
-			c.ctx.ConstStruct(wrappers, false),
-		}, false)
-		global = llvm.AddGlobal(c.mod, globalValue.Type(), globalName)
-		global.SetInitializer(globalValue)
-		global.SetGlobalConstant(true)
-		global.SetUnnamedAddr(true)
-		global.SetLinkage(llvm.LinkOnceODRLinkage)
+	global := c.mod.NamedGlobal(typ.String() + "$methodset")
+	zero := llvm.ConstInt(c.ctx.Int32Type(), 0, false)
+	if !global.IsNil() {
+		// the method set already exists
+		return llvm.ConstGEP(global, []llvm.Value{zero, zero})
 	}
-	return global
+
+	ms := c.program.MethodSets.MethodSet(typ)
+	if ms.Len() == 0 {
+		// no methods, so can leave that one out
+		return llvm.ConstPointerNull(llvm.PointerType(c.getLLVMRuntimeType("interfaceMethodInfo"), 0))
+	}
+
+	methods := make([]llvm.Value, ms.Len())
+	interfaceMethodInfoType := c.getLLVMRuntimeType("interfaceMethodInfo")
+	for i := 0; i < ms.Len(); i++ {
+		method := ms.At(i)
+		signatureGlobal := c.getMethodSignature(method.Obj().(*types.Func))
+		fn := c.program.MethodValue(method)
+		llvmFn := c.getFunction(fn)
+		if llvmFn.IsNil() {
+			// compiler error, so panic
+			panic("cannot find function: " + c.getFunctionInfo(fn).linkName)
+		}
+		wrapper := c.getInterfaceInvokeWrapper(fn, llvmFn)
+		methodInfo := llvm.ConstNamedStruct(interfaceMethodInfoType, []llvm.Value{
+			signatureGlobal,
+			llvm.ConstPtrToInt(wrapper, c.uintptrType),
+		})
+		methods[i] = methodInfo
+	}
+	arrayType := llvm.ArrayType(interfaceMethodInfoType, len(methods))
+	value := llvm.ConstArray(interfaceMethodInfoType, methods)
+	global = llvm.AddGlobal(c.mod, arrayType, typ.String()+"$methodset")
+	global.SetInitializer(value)
+	global.SetGlobalConstant(true)
+	global.SetLinkage(llvm.LinkOnceODRLinkage)
+	return llvm.ConstGEP(global, []llvm.Value{zero, zero})
+}
+
+// getInterfaceMethodSet returns a global variable with the method set of the
+// given named interface type. This method set is used by the interface lowering
+// pass.
+func (c *compilerContext) getInterfaceMethodSet(typ types.Type) llvm.Value {
+	name := typ.String()
+	if _, ok := typ.(*types.Named); !ok {
+		// Anonymous interface.
+		name = "reflect/types.interface:" + name
+	}
+	global := c.mod.NamedGlobal(name + "$interface")
+	zero := llvm.ConstInt(c.ctx.Int32Type(), 0, false)
+	if !global.IsNil() {
+		// method set already exist, return it
+		return llvm.ConstGEP(global, []llvm.Value{zero, zero})
+	}
+
+	// Every method is a *i8 reference indicating the signature of this method.
+	methods := make([]llvm.Value, typ.Underlying().(*types.Interface).NumMethods())
+	for i := range methods {
+		method := typ.Underlying().(*types.Interface).Method(i)
+		methods[i] = c.getMethodSignature(method)
+	}
+
+	value := llvm.ConstArray(c.i8ptrType, methods)
+	global = llvm.AddGlobal(c.mod, value.Type(), name+"$interface")
+	global.SetInitializer(value)
+	global.SetGlobalConstant(true)
+	global.SetLinkage(llvm.LinkOnceODRLinkage)
+	return llvm.ConstGEP(global, []llvm.Value{zero, zero})
 }

 // getMethodSignatureName returns a unique name (that can be used as the name of
@@ -681,33 +345,26 @@ func (c *compilerContext) getMethodSignature(method *types.Func) llvm.Value {
 // Type asserts on concrete types are trivial: just compare type numbers. Type
 // asserts on interfaces are more difficult, see the comments in the function.
 func (b *builder) createTypeAssert(expr *ssa.TypeAssert) llvm.Value {
-	itf := b.getValue(expr.X, getPos(expr))
+	itf := b.getValue(expr.X)
 	assertedType := b.getLLVMType(expr.AssertedType)

 	actualTypeNum := b.CreateExtractValue(itf, 0, "interface.type")
 	commaOk := llvm.Value{}
+	if _, ok := expr.AssertedType.Underlying().(*types.Interface); ok {
+		// Type assert on interface type.
+		// This is a call to an interface type assert function.
+		// The interface lowering pass will define this function by filling it
+		// with a type switch over all concrete types that implement this
+		// interface, and returning whether it's one of the matched types.
+		// This is very different from how interface asserts are implemented in
+		// the main Go compiler, where the runtime checks whether the type
+		// implements each method of the interface. See:
+		// https://research.swtch.com/interfaces
+		fn := b.getInterfaceImplementsFunc(expr.AssertedType)
+		commaOk = b.CreateCall(fn, []llvm.Value{actualTypeNum}, "")

-	if intf, ok := expr.AssertedType.Underlying().(*types.Interface); ok {
-		if intf.Empty() {
-			// intf is the empty interface => no methods
-			// This type assertion always succeeds, so we can just set commaOk to true.
-			commaOk = llvm.ConstInt(b.ctx.Int1Type(), 1, true)
-		} else {
-			// Type assert on interface type with methods.
-			// This is a call to an interface type assert function.
-			// The interface lowering pass will define this function by filling it
-			// with a type switch over all concrete types that implement this
-			// interface, and returning whether it's one of the matched types.
-			// This is very different from how interface asserts are implemented in
-			// the main Go compiler, where the runtime checks whether the type
-			// implements each method of the interface. See:
-			// https://research.swtch.com/interfaces
-			fn := b.getInterfaceImplementsFunc(expr.AssertedType)
-			commaOk = b.CreateCall(fn.GlobalValueType(), fn, []llvm.Value{actualTypeNum}, "")
-		}
 	} else {
-		name, _ := getTypeCodeName(expr.AssertedType)
-		globalName := "reflect/types.typeid:" + name
+		globalName := "reflect/types.typeid:" + getTypeCodeName(expr.AssertedType)
 		assertedTypeCodeGlobal := b.mod.NamedGlobal(globalName)
 		if assertedTypeCodeGlobal.IsNil() {
 			// Create a new typecode global.
@@ -780,14 +437,13 @@ func (c *compilerContext) getMethodsString(itf *types.Interface) string {
 	return strings.Join(methods, "; ")
 }

-// getInterfaceImplementsFunc returns a declared function that works as a type
+// getInterfaceImplementsfunc returns a declared function that works as a type
 // switch. The interface lowering pass will define this function.
 func (c *compilerContext) getInterfaceImplementsFunc(assertedType types.Type) llvm.Value {
-	s, _ := getTypeCodeName(assertedType.Underlying())
-	fnName := s + ".$typeassert"
+	fnName := getTypeCodeName(assertedType.Underlying()) + ".$typeassert"
 	llvmFn := c.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
-		llvmFnType := llvm.FunctionType(c.ctx.Int1Type(), []llvm.Type{c.dataPtrType}, false)
+		llvmFnType := llvm.FunctionType(c.ctx.Int1Type(), []llvm.Type{c.uintptrType}, false)
 		llvmFn = llvm.AddFunction(c.mod, fnName, llvmFnType)
 		c.addStandardDeclaredAttributes(llvmFn)
 		methods := c.getMethodsString(assertedType.Underlying().(*types.Interface))
@@ -800,8 +456,7 @@ func (c *compilerContext) getInterfaceImplementsFunc(assertedType types.Type) ll
 // thunk is declared, not defined: it will be defined by the interface lowering
 // pass.
 func (c *compilerContext) getInvokeFunction(instr *ssa.CallCommon) llvm.Value {
-	s, _ := getTypeCodeName(instr.Value.Type().Underlying())
-	fnName := s + "." + instr.Method.Name() + "$invoke"
+	fnName := getTypeCodeName(instr.Value.Type().Underlying()) + "." + instr.Method.Name() + "$invoke"
 	llvmFn := c.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
 		sig := instr.Method.Type().(*types.Signature)
@@ -809,8 +464,8 @@ func (c *compilerContext) getInvokeFunction(instr *ssa.CallCommon) llvm.Value {
 		for i := 0; i < sig.Params().Len(); i++ {
 			paramTuple = append(paramTuple, sig.Params().At(i))
 		}
-		paramTuple = append(paramTuple, types.NewVar(token.NoPos, nil, "$typecode", types.Typ[types.UnsafePointer]))
-		llvmFnType := c.getLLVMFunctionType(types.NewSignature(sig.Recv(), types.NewTuple(paramTuple...), sig.Results(), false))
+		paramTuple = append(paramTuple, types.NewVar(token.NoPos, nil, "$typecode", types.Typ[types.Uintptr]))
+		llvmFnType := c.getRawFuncType(types.NewSignature(sig.Recv(), types.NewTuple(paramTuple...), sig.Results(), false)).ElementType()
 		llvmFn = llvm.AddFunction(c.mod, fnName, llvmFnType)
 		c.addStandardDeclaredAttributes(llvmFn)
 		llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("tinygo-invoke", c.getMethodSignatureName(instr.Method)))
@@ -825,7 +480,7 @@ func (c *compilerContext) getInvokeFunction(instr *ssa.CallCommon) llvm.Value {
 // value, dereferences or unpacks it if necessary, and calls the real method.
 // If the method to wrap has a pointer receiver, no wrapping is necessary and
 // the function is returned directly.
-func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFnType llvm.Type, llvmFn llvm.Value) llvm.Value {
+func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFn llvm.Value) llvm.Value {
 	wrapperName := llvmFn.Name() + "$invoke"
 	wrapper := c.mod.NamedFunction(wrapperName)
 	if !wrapper.IsNil() {
@@ -850,8 +505,9 @@ func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFnType
 	}

 	// create wrapper function
-	paramTypes := append([]llvm.Type{c.dataPtrType}, llvmFnType.ParamTypes()[len(expandedReceiverType):]...)
-	wrapFnType := llvm.FunctionType(llvmFnType.ReturnType(), paramTypes, false)
+	fnType := llvmFn.Type().ElementType()
+	paramTypes := append([]llvm.Type{c.i8ptrType}, fnType.ParamTypes()[len(expandedReceiverType):]...)
+	wrapFnType := llvm.FunctionType(fnType.ReturnType(), paramTypes, false)
 	wrapper = llvm.AddFunction(c.mod, wrapperName, wrapFnType)
 	c.addStandardAttributes(wrapper)

@@ -878,11 +534,11 @@ func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFnType

 	receiverValue := b.emitPointerUnpack(wrapper.Param(0), []llvm.Type{receiverType})[0]
 	params := append(b.expandFormalParam(receiverValue), wrapper.Params()[1:]...)
-	if llvmFnType.ReturnType().TypeKind() == llvm.VoidTypeKind {
-		b.CreateCall(llvmFnType, llvmFn, params, "")
+	if llvmFn.Type().ElementType().ReturnType().TypeKind() == llvm.VoidTypeKind {
+		b.CreateCall(llvmFn, params, "")
 		b.CreateRetVoid()
 	} else {
-		ret := b.CreateCall(llvmFnType, llvmFn, params, "ret")
+		ret := b.CreateCall(llvmFn, params, "ret")
 		b.CreateRet(ret)
 	}

@@ -946,7 +602,7 @@ func typestring(t types.Type) string {
 	case *types.Array:
 		return "[" + strconv.FormatInt(t.Len(), 10) + "]" + typestring(t.Elem())
 	case *types.Basic:
-		return basicTypeNames[t.Kind()]
+		return basicTypes[t.Kind()]
 	case *types.Chan:
 		switch t.Dir() {
 		case types.SendRecv:
@@ -24,7 +24,7 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro
 	// Note that bound functions are allowed if the function has a pointer
 	// receiver and is a global. This is rather strict but still allows for
 	// idiomatic Go code.
-	funcValue := b.getValue(instr.Args[1], getPos(instr))
+	funcValue := b.getValue(instr.Args[1])
 	if funcValue.IsAConstant().IsNil() {
 		// Try to determine the cause of the non-constantness for a nice error
 		// message.
@@ -36,13 +36,11 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro
 		// Fall back to a generic error.
 		return llvm.Value{}, b.makeError(instr.Pos(), "interrupt function must be constant")
 	}
-	funcRawPtr, funcContext := b.decodeFuncValue(funcValue)
+	funcRawPtr, funcContext := b.decodeFuncValue(funcValue, nil)
 	funcPtr := llvm.ConstPtrToInt(funcRawPtr, b.uintptrType)

 	// Create a new global of type runtime/interrupt.handle. Globals of this
 	// type are lowered in the interrupt lowering pass.
-	// It must have an alignment of 1, otherwise LLVM thinks a ptrtoint of the
-	// global has the lower bits unset.
 	globalType := b.program.ImportedPackage("runtime/interrupt").Type("handle").Type()
 	globalLLVMType := b.getLLVMType(globalType)
 	globalName := b.fn.Package().Pkg.Path() + "$interrupt" + strconv.FormatInt(id.Int64(), 10)
@@ -50,13 +48,10 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro
 	global.SetVisibility(llvm.HiddenVisibility)
 	global.SetGlobalConstant(true)
 	global.SetUnnamedAddr(true)
-	global.SetAlignment(1)
 	initializer := llvm.ConstNull(globalLLVMType)
-	initializer = b.CreateInsertValue(initializer, funcContext, 0, "")
-	initializer = b.CreateInsertValue(initializer, funcPtr, 1, "")
-	initializer = b.CreateInsertValue(initializer, llvm.ConstNamedStruct(globalLLVMType.StructElementTypes()[2], []llvm.Value{
-		llvm.ConstInt(b.intType, uint64(id.Int64()), true),
-	}), 2, "")
+	initializer = llvm.ConstInsertValue(initializer, funcContext, []uint32{0})
+	initializer = llvm.ConstInsertValue(initializer, funcPtr, []uint32{1})
+	initializer = llvm.ConstInsertValue(initializer, llvm.ConstInt(b.intType, uint64(id.Int64()), true), []uint32{2, 0})
 	global.SetInitializer(initializer)

 	// Add debug info to the interrupt global.
@@ -90,7 +85,7 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro
 			useFnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{interrupt.Type()}, false)
 			useFn = llvm.AddFunction(b.mod, "runtime/interrupt.use", useFnType)
 		}
-		b.CreateCall(useFn.GlobalValueType(), useFn, []llvm.Value{interrupt}, "")
+		b.CreateCall(useFn, []llvm.Value{interrupt}, "")
 	}

 	return interrupt, nil
@@ -23,10 +23,6 @@ func (b *builder) defineIntrinsicFunction() {
 		b.createMemoryCopyImpl()
 	case name == "runtime.memzero":
 		b.createMemoryZeroImpl()
-	case name == "runtime.stacksave":
-		b.createStackSaveImpl()
-	case name == "runtime.KeepAlive":
-		b.createKeepAliveImpl()
 	case strings.HasPrefix(name, "runtime/volatile.Load"):
 		b.createVolatileLoad()
 	case strings.HasPrefix(name, "runtime/volatile.Store"):
@@ -48,18 +44,18 @@ func (b *builder) defineIntrinsicFunction() {
 // and will otherwise be lowered to regular libc memcpy/memmove calls.
 func (b *builder) createMemoryCopyImpl() {
 	b.createFunctionStart(true)
-	fnName := "llvm." + b.fn.Name() + ".p0.p0.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
+	fnName := "llvm." + b.fn.Name() + ".p0i8.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
 	llvmFn := b.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
-		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType, b.dataPtrType, b.uintptrType, b.ctx.Int1Type()}, false)
+		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.i8ptrType, b.uintptrType, b.ctx.Int1Type()}, false)
 		llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
 	}
 	var params []llvm.Value
 	for _, param := range b.fn.Params {
-		params = append(params, b.getValue(param, getPos(b.fn)))
+		params = append(params, b.getValue(param))
 	}
 	params = append(params, llvm.ConstInt(b.ctx.Int1Type(), 0, false))
-	b.CreateCall(llvmFn.GlobalValueType(), llvmFn, params, "")
+	b.CreateCall(llvmFn, params, "")
 	b.CreateRetVoid()
 }

@@ -68,56 +64,19 @@ func (b *builder) createMemoryCopyImpl() {
 // regular libc memset calls if they aren't optimized out in a different way.
 func (b *builder) createMemoryZeroImpl() {
 	b.createFunctionStart(true)
-	llvmFn := b.getMemsetFunc()
+	fnName := "llvm.memset.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
+	llvmFn := b.mod.NamedFunction(fnName)
+	if llvmFn.IsNil() {
+		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.ctx.Int8Type(), b.uintptrType, b.ctx.Int1Type()}, false)
+		llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
+	}
 	params := []llvm.Value{
-		b.getValue(b.fn.Params[0], getPos(b.fn)),
+		b.getValue(b.fn.Params[0]),
 		llvm.ConstInt(b.ctx.Int8Type(), 0, false),
-		b.getValue(b.fn.Params[1], getPos(b.fn)),
+		b.getValue(b.fn.Params[1]),
 		llvm.ConstInt(b.ctx.Int1Type(), 0, false),
 	}
-	b.CreateCall(llvmFn.GlobalValueType(), llvmFn, params, "")
-	b.CreateRetVoid()
-}
-
-// createStackSaveImpl creates a call to llvm.stacksave.p0 to read the current
-// stack pointer.
-func (b *builder) createStackSaveImpl() {
-	b.createFunctionStart(true)
-	sp := b.readStackPointer()
-	b.CreateRet(sp)
-}
-
-// Return the llvm.memset.p0.i8 function declaration.
-func (c *compilerContext) getMemsetFunc() llvm.Value {
-	fnName := "llvm.memset.p0.i" + strconv.Itoa(c.uintptrType.IntTypeWidth())
-	llvmFn := c.mod.NamedFunction(fnName)
-	if llvmFn.IsNil() {
-		fnType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType, c.ctx.Int8Type(), c.uintptrType, c.ctx.Int1Type()}, false)
-		llvmFn = llvm.AddFunction(c.mod, fnName, fnType)
-	}
-	return llvmFn
-}
-
-// createKeepAlive creates the runtime.KeepAlive function. It is implemented
-// using inline assembly.
-func (b *builder) createKeepAliveImpl() {
-	b.createFunctionStart(true)
-
-	// Get the underlying value of the interface value.
-	interfaceValue := b.getValue(b.fn.Params[0], getPos(b.fn))
-	pointerValue := b.CreateExtractValue(interfaceValue, 1, "")
-
-	// Create an equivalent of the following C code, which is basically just a
-	// nop but ensures the pointerValue is kept alive:
-	//
-	//     __asm__ __volatile__("" : : "r"(pointerValue))
-	//
-	// It should be portable to basically everything as the "r" register type
-	// exists basically everywhere.
-	asmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType}, false)
-	asmFn := llvm.InlineAsm(asmType, "", "r", true, false, 0, false)
-	b.createCall(asmType, asmFn, []llvm.Value{pointerValue}, "")
-
+	b.CreateCall(llvmFn, params, "")
 	b.CreateRetVoid()
 }

@@ -158,123 +117,8 @@ func (b *builder) defineMathOp() {
 	// Create a call to the intrinsic.
 	args := make([]llvm.Value, len(b.fn.Params))
 	for i, param := range b.fn.Params {
-		args[i] = b.getValue(param, getPos(b.fn))
+		args[i] = b.getValue(param)
 	}
-	result := b.CreateCall(llvmFn.GlobalValueType(), llvmFn, args, "")
+	result := b.CreateCall(llvmFn, args, "")
 	b.CreateRet(result)
 }
-
-// Implement most math/bits functions.
-//
-// This implements all the functions that operate on bits. It does not yet
-// implement the arithmetic functions (like bits.Add), which also have LLVM
-// intrinsics.
-func (b *builder) defineMathBitsIntrinsic() bool {
-	if b.fn.Pkg.Pkg.Path() != "math/bits" {
-		return false
-	}
-	name := b.fn.Name()
-	switch name {
-	case "LeadingZeros", "LeadingZeros8", "LeadingZeros16", "LeadingZeros32", "LeadingZeros64",
-		"TrailingZeros", "TrailingZeros8", "TrailingZeros16", "TrailingZeros32", "TrailingZeros64":
-		b.createFunctionStart(true)
-		param := b.getValue(b.fn.Params[0], b.fn.Pos())
-		valueType := param.Type()
-		var intrinsicName string
-		if strings.HasPrefix(name, "Leading") { // LeadingZeros
-			intrinsicName = "llvm.ctlz.i" + strconv.Itoa(valueType.IntTypeWidth())
-		} else { // TrailingZeros
-			intrinsicName = "llvm.cttz.i" + strconv.Itoa(valueType.IntTypeWidth())
-		}
-		llvmFn := b.mod.NamedFunction(intrinsicName)
-		llvmFnType := llvm.FunctionType(valueType, []llvm.Type{valueType, b.ctx.Int1Type()}, false)
-		if llvmFn.IsNil() {
-			llvmFn = llvm.AddFunction(b.mod, intrinsicName, llvmFnType)
-		}
-		result := b.createCall(llvmFnType, llvmFn, []llvm.Value{
-			param,
-			llvm.ConstInt(b.ctx.Int1Type(), 0, false),
-		}, "")
-		result = b.createZExtOrTrunc(result, b.intType)
-		b.CreateRet(result)
-		return true
-	case "Len", "Len8", "Len16", "Len32", "Len64":
-		// bits.Len can be implemented as:
-		//     (unsafe.Sizeof(v) * 8) -  bits.LeadingZeros(n)
-		// Not sure why this isn't already done in the standard library, as it
-		// is much simpler than a lookup table.
-		b.createFunctionStart(true)
-		param := b.getValue(b.fn.Params[0], b.fn.Pos())
-		valueType := param.Type()
-		valueBits := valueType.IntTypeWidth()
-		intrinsicName := "llvm.ctlz.i" + strconv.Itoa(valueBits)
-		llvmFn := b.mod.NamedFunction(intrinsicName)
-		llvmFnType := llvm.FunctionType(valueType, []llvm.Type{valueType, b.ctx.Int1Type()}, false)
-		if llvmFn.IsNil() {
-			llvmFn = llvm.AddFunction(b.mod, intrinsicName, llvmFnType)
-		}
-		result := b.createCall(llvmFnType, llvmFn, []llvm.Value{
-			param,
-			llvm.ConstInt(b.ctx.Int1Type(), 0, false),
-		}, "")
-		result = b.createZExtOrTrunc(result, b.intType)
-		maxLen := llvm.ConstInt(b.intType, uint64(valueBits), false) // number of bits in the value
-		result = b.CreateSub(maxLen, result, "")
-		b.CreateRet(result)
-		return true
-	case "OnesCount", "OnesCount8", "OnesCount16", "OnesCount32", "OnesCount64":
-		b.createFunctionStart(true)
-		param := b.getValue(b.fn.Params[0], b.fn.Pos())
-		valueType := param.Type()
-		intrinsicName := "llvm.ctpop.i" + strconv.Itoa(valueType.IntTypeWidth())
-		llvmFn := b.mod.NamedFunction(intrinsicName)
-		llvmFnType := llvm.FunctionType(valueType, []llvm.Type{valueType}, false)
-		if llvmFn.IsNil() {
-			llvmFn = llvm.AddFunction(b.mod, intrinsicName, llvmFnType)
-		}
-		result := b.createCall(llvmFnType, llvmFn, []llvm.Value{param}, "")
-		result = b.createZExtOrTrunc(result, b.intType)
-		b.CreateRet(result)
-		return true
-	case "Reverse", "Reverse8", "Reverse16", "Reverse32", "Reverse64",
-		"ReverseBytes", "ReverseBytes16", "ReverseBytes32", "ReverseBytes64":
-		b.createFunctionStart(true)
-		param := b.getValue(b.fn.Params[0], b.fn.Pos())
-		valueType := param.Type()
-		var intrinsicName string
-		if strings.HasPrefix(name, "ReverseBytes") {
-			intrinsicName = "llvm.bswap.i" + strconv.Itoa(valueType.IntTypeWidth())
-		} else { // Reverse
-			intrinsicName = "llvm.bitreverse.i" + strconv.Itoa(valueType.IntTypeWidth())
-		}
-		llvmFn := b.mod.NamedFunction(intrinsicName)
-		llvmFnType := llvm.FunctionType(valueType, []llvm.Type{valueType}, false)
-		if llvmFn.IsNil() {
-			llvmFn = llvm.AddFunction(b.mod, intrinsicName, llvmFnType)
-		}
-		result := b.createCall(llvmFnType, llvmFn, []llvm.Value{param}, "")
-		b.CreateRet(result)
-		return true
-	case "RotateLeft", "RotateLeft8", "RotateLeft16", "RotateLeft32", "RotateLeft64":
-		// Warning: the documentation says these functions must be constant time.
-		// I do not think LLVM guarantees this, but there's a good chance LLVM
-		// already recognized the rotate instruction so it probably won't get
-		// any _worse_ by implementing these rotate functions.
-		b.createFunctionStart(true)
-		x := b.getValue(b.fn.Params[0], b.fn.Pos())
-		k := b.getValue(b.fn.Params[1], b.fn.Pos())
-		valueType := x.Type()
-		intrinsicName := "llvm.fshl.i" + strconv.Itoa(valueType.IntTypeWidth())
-		llvmFn := b.mod.NamedFunction(intrinsicName)
-		llvmFnType := llvm.FunctionType(valueType, []llvm.Type{valueType, valueType, valueType}, false)
-		if llvmFn.IsNil() {
-			llvmFn = llvm.AddFunction(b.mod, intrinsicName, llvmFnType)
-		}
-		k = b.createZExtOrTrunc(k, valueType)
-		result := b.createCall(llvmFnType, llvmFn, []llvm.Value{x, x, k}, "")
-		b.CreateRet(result)
-		return true
-	default:
-		return false
-	}
-}
@@ -70,7 +70,10 @@ func (c *checker) checkType(t llvm.Type, checked map[llvm.Type]struct{}, special
 			return fmt.Errorf("failed to verify element type of array type %s: %s", t.String(), err.Error())
 		}
 	case llvm.PointerTypeKind:
-		// Pointers can't be checked in an opaque pointer world.
+		// check underlying type
+		if err := c.checkType(t.ElementType(), checked, specials); err != nil {
+			return fmt.Errorf("failed to verify underlying type of pointer type %s: %s", t.String(), err.Error())
+		}
 	case llvm.VectorTypeKind:
 		// check element type
 		if err := c.checkType(t.ElementType(), checked, specials); err != nil {
@@ -7,7 +7,6 @@ import (
 	"math/big"
 	"strings"

-	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"tinygo.org/x/go-llvm"
 )
@@ -21,7 +20,7 @@ import (
 //
 // This is useful for creating temporary allocas for intrinsics. Don't forget to
 // end the lifetime using emitLifetimeEnd after you're done with it.
-func (b *builder) createTemporaryAlloca(t llvm.Type, name string) (alloca, size llvm.Value) {
+func (b *builder) createTemporaryAlloca(t llvm.Type, name string) (alloca, bitcast, size llvm.Value) {
 	return llvmutil.CreateTemporaryAlloca(b.Builder, b.mod, t, name)
 }

@@ -52,172 +51,29 @@ func (b *builder) emitLifetimeEnd(ptr, size llvm.Value) {
 // emitPointerPack packs the list of values into a single pointer value using
 // bitcasts, or else allocates a value on the heap if it cannot be packed in the
 // pointer value directly. It returns the pointer with the packed data.
-// If the values are all constants, they are be stored in a constant global and
-// deduplicated.
 func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {
-	valueTypes := make([]llvm.Type, len(values))
-	for i, value := range values {
-		valueTypes[i] = value.Type()
-	}
-	packedType := b.ctx.StructType(valueTypes, false)
-
-	// Allocate memory for the packed data.
-	size := b.targetData.TypeAllocSize(packedType)
-	if size == 0 {
-		return llvm.ConstPointerNull(b.dataPtrType)
-	} else if len(values) == 1 && values[0].Type().TypeKind() == llvm.PointerTypeKind {
-		return values[0]
-	} else if size <= b.targetData.TypeAllocSize(b.dataPtrType) {
-		// Packed data fits in a pointer, so store it directly inside the
-		// pointer.
-		if len(values) == 1 && values[0].Type().TypeKind() == llvm.IntegerTypeKind {
-			// Try to keep this cast in SSA form.
-			return b.CreateIntToPtr(values[0], b.dataPtrType, "pack.int")
-		}
-
-		// Because packedType is a struct and we have to cast it to a *i8, store
-		// it in a *i8 alloca first and load the *i8 value from there. This is
-		// effectively a bitcast.
-		packedAlloc, _ := b.createTemporaryAlloca(b.dataPtrType, "")
-
-		if size < b.targetData.TypeAllocSize(b.dataPtrType) {
-			// The alloca is bigger than the value that will be stored in it.
-			// To avoid having some bits undefined, zero the alloca first.
-			// Hopefully this will get optimized away.
-			b.CreateStore(llvm.ConstNull(b.dataPtrType), packedAlloc)
-		}
-
-		// Store all values in the alloca.
-		for i, value := range values {
-			indices := []llvm.Value{
-				llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-				llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
-			}
-			gep := b.CreateInBoundsGEP(packedType, packedAlloc, indices, "")
-			b.CreateStore(value, gep)
-		}
-
-		// Load value (the *i8) from the alloca.
-		result := b.CreateLoad(b.dataPtrType, packedAlloc, "")
-
-		// End the lifetime of the alloca, to help the optimizer.
-		packedSize := llvm.ConstInt(b.ctx.Int64Type(), b.targetData.TypeAllocSize(packedAlloc.Type()), false)
-		b.emitLifetimeEnd(packedAlloc, packedSize)
-
-		return result
-	} else {
-		// Check if the values are all constants.
-		constant := true
-		for _, v := range values {
-			if !v.IsConstant() {
-				constant = false
-				break
-			}
-		}
-
-		if constant {
-			// The data is known at compile time, so store it in a constant global.
-			// The global address is marked as unnamed, which allows LLVM to merge duplicates.
-			global := llvm.AddGlobal(b.mod, packedType, b.pkg.Path()+"$pack")
-			global.SetInitializer(b.ctx.ConstStruct(values, false))
-			global.SetGlobalConstant(true)
-			global.SetUnnamedAddr(true)
-			global.SetLinkage(llvm.InternalLinkage)
-			return global
-		}
-
-		// Packed data is bigger than a pointer, so allocate it on the heap.
-		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
-		align := b.targetData.ABITypeAlignment(packedType)
-		alloc := b.mod.NamedFunction("runtime.alloc")
-		packedAlloc := b.CreateCall(alloc.GlobalValueType(), alloc, []llvm.Value{
-			sizeValue,
-			llvm.ConstNull(b.dataPtrType),
-			llvm.Undef(b.dataPtrType), // unused context parameter
-		}, "")
-		packedAlloc.AddCallSiteAttribute(0, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(align)))
-		if b.NeedsStackObjects {
-			b.trackPointer(packedAlloc)
-		}
-
-		// Store all values in the heap pointer.
-		for i, value := range values {
-			indices := []llvm.Value{
-				llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-				llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
-			}
-			gep := b.CreateInBoundsGEP(packedType, packedAlloc, indices, "")
-			b.CreateStore(value, gep)
-		}
-
-		// Return the original heap allocation pointer, which already is an *i8.
-		return packedAlloc
-	}
+	return llvmutil.EmitPointerPack(b.Builder, b.mod, b.pkg.Path(), b.NeedsStackObjects, values)
 }

 // emitPointerUnpack extracts a list of values packed using emitPointerPack.
 func (b *builder) emitPointerUnpack(ptr llvm.Value, valueTypes []llvm.Type) []llvm.Value {
-	packedType := b.ctx.StructType(valueTypes, false)
-
-	// Get a correctly-typed pointer to the packed data.
-	var packedAlloc llvm.Value
-	needsLifetimeEnd := false
-	size := b.targetData.TypeAllocSize(packedType)
-	if size == 0 {
-		// No data to unpack.
-	} else if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.PointerTypeKind {
-		// A single pointer is always stored directly.
-		return []llvm.Value{ptr}
-	} else if size <= b.targetData.TypeAllocSize(b.dataPtrType) {
-		// Packed data stored directly in pointer.
-		if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.IntegerTypeKind {
-			// Keep this cast in SSA form.
-			return []llvm.Value{b.CreatePtrToInt(ptr, valueTypes[0], "unpack.int")}
-		}
-		// Fallback: load it using an alloca.
-		packedAlloc, _ = b.createTemporaryAlloca(b.dataPtrType, "unpack.raw.alloc")
-		b.CreateStore(ptr, packedAlloc)
-		needsLifetimeEnd = true
-	} else {
-		// Packed data stored on the heap.
-		packedAlloc = ptr
-	}
-	// Load each value from the packed data.
-	values := make([]llvm.Value, len(valueTypes))
-	for i, valueType := range valueTypes {
-		if b.targetData.TypeAllocSize(valueType) == 0 {
-			// This value has length zero, so there's nothing to load.
-			values[i] = llvm.ConstNull(valueType)
-			continue
-		}
-		indices := []llvm.Value{
-			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
-			llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
-		}
-		gep := b.CreateInBoundsGEP(packedType, packedAlloc, indices, "")
-		values[i] = b.CreateLoad(valueType, gep, "")
-	}
-	if needsLifetimeEnd {
-		allocSize := llvm.ConstInt(b.ctx.Int64Type(), b.targetData.TypeAllocSize(b.uintptrType), false)
-		b.emitLifetimeEnd(packedAlloc, allocSize)
-	}
-	return values
+	return llvmutil.EmitPointerUnpack(b.Builder, b.mod, ptr, valueTypes)
 }

 // makeGlobalArray creates a new LLVM global with the given name and integers as
-// contents, and returns the global and initializer type.
+// contents, and returns the global.
 // Note that it is left with the default linkage etc., you should set
 // linkage/constant/etc properties yourself.
-func (c *compilerContext) makeGlobalArray(buf []byte, name string, elementType llvm.Type) (llvm.Type, llvm.Value) {
+func (c *compilerContext) makeGlobalArray(buf []byte, name string, elementType llvm.Type) llvm.Value {
 	globalType := llvm.ArrayType(elementType, len(buf))
 	global := llvm.AddGlobal(c.mod, globalType, name)
 	value := llvm.Undef(globalType)
 	for i := 0; i < len(buf); i++ {
 		ch := uint64(buf[i])
-		value = c.builder.CreateInsertValue(value, llvm.ConstInt(elementType, ch, false), i, "")
+		value = llvm.ConstInsertValue(value, llvm.ConstInt(elementType, ch, false), []uint32{uint32(i)})
 	}
 	global.SetInitializer(value)
-	return globalType, global
+	return global
 }

 // createObjectLayout returns a LLVM value (of type i8*) that describes where
@@ -228,8 +84,6 @@ func (c *compilerContext) makeGlobalArray(buf []byte, name string, elementType l
 // which words contain a pointer (indicated by setting the given bit to 1). For
 // arrays, only the element is stored. This works because the GC knows the
 // object size and can therefore know how this value is repeated in the object.
-//
-// For details on what's in this value, see src/runtime/gc_precise.go.
 func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Value {
 	// Use the element type for arrays. This works even for nested arrays.
 	for {
@@ -251,12 +105,12 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	// Do a few checks to see whether we need to generate any object layout
 	// information at all.
 	objectSizeBytes := c.targetData.TypeAllocSize(t)
-	pointerSize := c.targetData.TypeAllocSize(c.dataPtrType)
-	pointerAlignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
+	pointerSize := c.targetData.TypeAllocSize(c.i8ptrType)
+	pointerAlignment := c.targetData.PrefTypeAlignment(c.i8ptrType)
 	if objectSizeBytes < pointerSize {
 		// Too small to contain a pointer.
 		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
 	}
 	bitmap := c.getPointerBitmap(t, pos)
 	if bitmap.BitLen() == 0 {
@@ -264,13 +118,13 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		// TODO: this can be done in many other cases, e.g. when allocating an
 		// array (like [4][]byte, which repeats a slice 4 times).
 		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
 	}
 	if objectSizeBytes%uint64(pointerAlignment) != 0 {
 		// This shouldn't happen except for packed structs, which aren't
 		// currently used.
 		c.addError(pos, "internal error: unexpected object size for object with pointer field")
-		return llvm.ConstNull(c.dataPtrType)
+		return llvm.ConstNull(c.i8ptrType)
 	}
 	objectSizeWords := objectSizeBytes / uint64(pointerAlignment)

@@ -295,7 +149,7 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		// The runtime knows that if the least significant bit of the pointer is
 		// set, the pointer contains the value itself.
 		layout := bitmap.Uint64()<<(sizeFieldBits+1) | (objectSizeWords << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
 	}

 	// Unfortunately, the object layout is too big to fit in a pointer-sized
@@ -306,13 +160,12 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	globalName := "runtime/gc.layout:" + fmt.Sprintf("%d-%0*x", objectSizeWords, (objectSizeWords+15)/16, bitmap)
 	global := c.mod.NamedGlobal(globalName)
 	if !global.IsNil() {
-		return global
+		return llvm.ConstBitCast(global, c.i8ptrType)
 	}

 	// Create the global initializer.
 	bitmapBytes := make([]byte, int(objectSizeWords+7)/8)
 	bitmap.FillBytes(bitmapBytes)
-	reverseBytes(bitmapBytes) // big-endian to little-endian
 	var bitmapByteValues []llvm.Value
 	for _, b := range bitmapBytes {
 		bitmapByteValues = append(bitmapByteValues, llvm.ConstInt(c.ctx.Int8Type(), uint64(b), false))
@@ -357,13 +210,13 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		global.AddMetadata(0, diglobal)
 	}

-	return global
+	return llvm.ConstBitCast(global, c.i8ptrType)
 }

 // getPointerBitmap scans the given LLVM type for pointers and sets bits in a
 // bigint at the word offset that contains a pointer. This scan is recursive.
 func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.Int {
-	alignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
+	alignment := c.targetData.PrefTypeAlignment(c.i8ptrType)
 	switch typ.TypeKind() {
 	case llvm.IntegerTypeKind, llvm.FloatTypeKind, llvm.DoubleTypeKind:
 		return big.NewInt(0)
@@ -371,6 +224,13 @@ func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.In
 		return big.NewInt(1)
 	case llvm.StructTypeKind:
 		ptrs := big.NewInt(0)
+		if typ.StructName() == "runtime.funcValue" {
+			// Hack: the type runtime.funcValue contains an 'id' field which is
+			// of type uintptr, but before the LowerFuncValues pass it actually
+			// contains a pointer (ptrtoint) to a global. This trips up the
+			// interp package. Therefore, make the id field a pointer for now.
+			typ = c.ctx.StructType([]llvm.Type{c.i8ptrType, c.i8ptrType}, false)
+		}
 		for i, subtyp := range typ.StructElementTypes() {
 			subptrs := c.getPointerBitmap(subtyp, pos)
 			if subptrs.BitLen() == 0 {
@@ -412,11 +272,18 @@ func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.In
 	}
 }

-// archFamily returns the architecture from the LLVM triple but with some
+// archFamily returns the archtecture from the LLVM triple but with some
 // architecture names ("armv6", "thumbv7m", etc) merged into a single
 // architecture name ("arm").
 func (c *compilerContext) archFamily() string {
-	return compileopts.CanonicalArchName(c.Triple)
+	arch := strings.Split(c.Triple, "-")[0]
+	if strings.HasPrefix(arch, "arm64") {
+		return "aarch64"
+	}
+	if strings.HasPrefix(arch, "arm") || strings.HasPrefix(arch, "thumb") {
+		return "arm"
+	}
+	return arch
 }

 // isThumb returns whether we're in ARM or in Thumb mode. It panics if the
@@ -440,36 +307,10 @@ func (c *compilerContext) isThumb() bool {
 // readStackPointer emits a LLVM intrinsic call that returns the current stack
 // pointer as an *i8.
 func (b *builder) readStackPointer() llvm.Value {
-	name := "llvm.stacksave.p0"
-	if llvmutil.Version() < 18 {
-		name = "llvm.stacksave" // backwards compatibility with LLVM 17 and below
-	}
-	stacksave := b.mod.NamedFunction(name)
+	stacksave := b.mod.NamedFunction("llvm.stacksave")
 	if stacksave.IsNil() {
-		fnType := llvm.FunctionType(b.dataPtrType, nil, false)
-		stacksave = llvm.AddFunction(b.mod, name, fnType)
-	}
-	return b.CreateCall(stacksave.GlobalValueType(), stacksave, nil, "")
-}
-
-// createZExtOrTrunc lets the input value fit in the output type bits, by zero
-// extending or truncating the integer.
-func (b *builder) createZExtOrTrunc(value llvm.Value, t llvm.Type) llvm.Value {
-	valueBits := value.Type().IntTypeWidth()
-	resultBits := t.IntTypeWidth()
-	if valueBits > resultBits {
-		value = b.CreateTrunc(value, t, "")
-	} else if valueBits < resultBits {
-		value = b.CreateZExt(value, t, "")
-	}
-	return value
-}
-
-// Reverse a slice of bytes. From the wiki:
-// https://github.com/golang/go/wiki/SliceTricks#reversing
-func reverseBytes(buf []byte) {
-	for i := len(buf)/2 - 1; i >= 0; i-- {
-		opp := len(buf) - 1 - i
-		buf[i], buf[opp] = buf[opp], buf[i]
+		fnType := llvm.FunctionType(b.i8ptrType, nil, false)
+		stacksave = llvm.AddFunction(b.mod, "llvm.stacksave", fnType)
 	}
+	return b.CreateCall(stacksave, nil, "")
 }
@@ -1,5 +1,5 @@
 // Package llvmutil contains utility functions used across multiple compiler
-// packages. For example, they may be used by both the compiler package and
+// packages. For example, they may be used by both the compiler pacakge and
 // transformation packages.
 //
 // Normally, utility packages are avoided. However, in this case, the utility
@@ -7,13 +7,7 @@
 // places would be a big risk if only one of them is updated.
 package llvmutil

-import (
-	"encoding/binary"
-	"strconv"
-	"strings"
-
-	"tinygo.org/x/go-llvm"
-)
+import "tinygo.org/x/go-llvm"

 // CreateEntryBlockAlloca creates a new alloca in the entry block, even though
 // the IR builder is located elsewhere. It assumes that the insert point is
@@ -32,19 +26,20 @@ func CreateEntryBlockAlloca(builder llvm.Builder, t llvm.Type, name string) llvm
 }

 // CreateTemporaryAlloca creates a new alloca in the entry block and adds
-// lifetime start information in the IR signalling that the alloca won't be used
+// lifetime start infromation in the IR signalling that the alloca won't be used
 // before this point.
 //
 // This is useful for creating temporary allocas for intrinsics. Don't forget to
 // end the lifetime using emitLifetimeEnd after you're done with it.
-func CreateTemporaryAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type, name string) (alloca, size llvm.Value) {
+func CreateTemporaryAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type, name string) (alloca, bitcast, size llvm.Value) {
 	ctx := t.Context()
 	targetData := llvm.NewTargetData(mod.DataLayout())
 	defer targetData.Dispose()
+	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
 	alloca = CreateEntryBlockAlloca(builder, t, name)
+	bitcast = builder.CreateBitCast(alloca, i8ptrType, name+".bitcast")
 	size = llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
-	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(getLifetimeStartFunc(mod), []llvm.Value{size, bitcast}, "")
 	return
 }

@@ -53,19 +48,19 @@ func CreateInstructionAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type,
 	ctx := mod.Context()
 	targetData := llvm.NewTargetData(mod.DataLayout())
 	defer targetData.Dispose()
+	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)

 	alloca := CreateEntryBlockAlloca(builder, t, name)
 	builder.SetInsertPointBefore(inst)
+	bitcast := builder.CreateBitCast(alloca, i8ptrType, name+".bitcast")
 	size := llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
-	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(getLifetimeStartFunc(mod), []llvm.Value{size, bitcast}, "")
 	if next := llvm.NextInstruction(inst); !next.IsNil() {
 		builder.SetInsertPointBefore(next)
 	} else {
 		builder.SetInsertPointAtEnd(inst.InstructionParent())
 	}
-	fnType, fn = getLifetimeEndFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
+	builder.CreateCall(getLifetimeEndFunc(mod), []llvm.Value{size, bitcast}, "")
 	return alloca
 }

@@ -73,36 +68,33 @@ func CreateInstructionAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type,
 // llvm.lifetime.end intrinsic. It is commonly used together with
 // createTemporaryAlloca.
 func EmitLifetimeEnd(builder llvm.Builder, mod llvm.Module, ptr, size llvm.Value) {
-	fnType, fn := getLifetimeEndFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, ptr}, "")
+	builder.CreateCall(getLifetimeEndFunc(mod), []llvm.Value{size, ptr}, "")
 }

 // getLifetimeStartFunc returns the llvm.lifetime.start intrinsic and creates it
 // first if it doesn't exist yet.
-func getLifetimeStartFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
-	fnName := "llvm.lifetime.start.p0"
-	fn := mod.NamedFunction(fnName)
+func getLifetimeStartFunc(mod llvm.Module) llvm.Value {
+	fn := mod.NamedFunction("llvm.lifetime.start.p0i8")
 	ctx := mod.Context()
-	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
+	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
 	if fn.IsNil() {
-		fn = llvm.AddFunction(mod, fnName, fnType)
+		fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), i8ptrType}, false)
+		fn = llvm.AddFunction(mod, "llvm.lifetime.start.p0i8", fnType)
 	}
-	return fnType, fn
+	return fn
 }

 // getLifetimeEndFunc returns the llvm.lifetime.end intrinsic and creates it
 // first if it doesn't exist yet.
-func getLifetimeEndFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
-	fnName := "llvm.lifetime.end.p0"
-	fn := mod.NamedFunction(fnName)
+func getLifetimeEndFunc(mod llvm.Module) llvm.Value {
+	fn := mod.NamedFunction("llvm.lifetime.end.p0i8")
 	ctx := mod.Context()
-	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
+	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
 	if fn.IsNil() {
-		fn = llvm.AddFunction(mod, fnName, fnType)
+		fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), i8ptrType}, false)
+		fn = llvm.AddFunction(mod, "llvm.lifetime.end.p0i8", fnType)
 	}
-	return fnType, fn
+	return fn
 }

 // SplitBasicBlock splits a LLVM basic block into two parts. All instructions
@@ -176,54 +168,3 @@ func SplitBasicBlock(builder llvm.Builder, afterInst llvm.Value, insertAfter llv

 	return newBlock
 }
-
-// AppendToGlobal appends the given values to a global array like llvm.used. The global might
-// not exist yet. The values can be any pointer type, they will be cast to i8*.
-func AppendToGlobal(mod llvm.Module, globalName string, values ...llvm.Value) {
-	// Read the existing values in the llvm.used array (if it exists).
-	var usedValues []llvm.Value
-	if used := mod.NamedGlobal(globalName); !used.IsNil() {
-		builder := mod.Context().NewBuilder()
-		defer builder.Dispose()
-		usedInitializer := used.Initializer()
-		num := usedInitializer.Type().ArrayLength()
-		for i := 0; i < num; i++ {
-			usedValues = append(usedValues, builder.CreateExtractValue(usedInitializer, i, ""))
-		}
-		used.EraseFromParentAsGlobal()
-	}
-
-	// Add the new values.
-	ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
-	for _, value := range values {
-		// Note: the bitcast is necessary to cast AVR function pointers to
-		// address space 0 pointer types.
-		usedValues = append(usedValues, llvm.ConstPointerCast(value, ptrType))
-	}
-
-	// Create a new array (with the old and new values).
-	usedInitializer := llvm.ConstArray(ptrType, usedValues)
-	used := llvm.AddGlobal(mod, usedInitializer.Type(), globalName)
-	used.SetInitializer(usedInitializer)
-	used.SetLinkage(llvm.AppendingLinkage)
-}
-
-// Version returns the LLVM major version.
-func Version() int {
-	majorStr := strings.Split(llvm.Version, ".")[0]
-	major, err := strconv.Atoi(majorStr)
-	if err != nil {
-		panic("unexpected error while parsing LLVM version: " + err.Error()) // should not happen
-	}
-	return major
-}
-
-// Return the byte order for the given target triple. Most targets are little
-// endian, but for example MIPS can be big-endian.
-func ByteOrder(target string) binary.ByteOrder {
-	if strings.HasPrefix(target, "mips-") {
-		return binary.BigEndian
-	} else {
-		return binary.LittleEndian
-	}
-}
@@ -0,0 +1,182 @@
+package llvmutil
+
+// This file contains utility functions to pack and unpack sets of values. It
+// can take in a list of values and tries to store it efficiently in the pointer
+// itself if possible and legal.
+
+import (
+	"tinygo.org/x/go-llvm"
+)
+
+// EmitPointerPack packs the list of values into a single pointer value using
+// bitcasts, or else allocates a value on the heap if it cannot be packed in the
+// pointer value directly. It returns the pointer with the packed data.
+// If the values are all constants, they are be stored in a constant global and deduplicated.
+func EmitPointerPack(builder llvm.Builder, mod llvm.Module, prefix string, needsStackObjects bool, values []llvm.Value) llvm.Value {
+	ctx := mod.Context()
+	targetData := llvm.NewTargetData(mod.DataLayout())
+	defer targetData.Dispose()
+	i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+	uintptrType := ctx.IntType(targetData.PointerSize() * 8)
+
+	valueTypes := make([]llvm.Type, len(values))
+	for i, value := range values {
+		valueTypes[i] = value.Type()
+	}
+	packedType := ctx.StructType(valueTypes, false)
+
+	// Allocate memory for the packed data.
+	size := targetData.TypeAllocSize(packedType)
+	if size == 0 {
+		return llvm.ConstPointerNull(i8ptrType)
+	} else if len(values) == 1 && values[0].Type().TypeKind() == llvm.PointerTypeKind {
+		return builder.CreateBitCast(values[0], i8ptrType, "pack.ptr")
+	} else if size <= targetData.TypeAllocSize(i8ptrType) {
+		// Packed data fits in a pointer, so store it directly inside the
+		// pointer.
+		if len(values) == 1 && values[0].Type().TypeKind() == llvm.IntegerTypeKind {
+			// Try to keep this cast in SSA form.
+			return builder.CreateIntToPtr(values[0], i8ptrType, "pack.int")
+		}
+
+		// Because packedType is a struct and we have to cast it to a *i8, store
+		// it in a *i8 alloca first and load the *i8 value from there. This is
+		// effectively a bitcast.
+		packedAlloc, _, _ := CreateTemporaryAlloca(builder, mod, i8ptrType, "")
+
+		if size < targetData.TypeAllocSize(i8ptrType) {
+			// The alloca is bigger than the value that will be stored in it.
+			// To avoid having some bits undefined, zero the alloca first.
+			// Hopefully this will get optimized away.
+			builder.CreateStore(llvm.ConstNull(i8ptrType), packedAlloc)
+		}
+
+		// Store all values in the alloca.
+		packedAllocCast := builder.CreateBitCast(packedAlloc, llvm.PointerType(packedType, 0), "")
+		for i, value := range values {
+			indices := []llvm.Value{
+				llvm.ConstInt(ctx.Int32Type(), 0, false),
+				llvm.ConstInt(ctx.Int32Type(), uint64(i), false),
+			}
+			gep := builder.CreateInBoundsGEP(packedAllocCast, indices, "")
+			builder.CreateStore(value, gep)
+		}
+
+		// Load value (the *i8) from the alloca.
+		result := builder.CreateLoad(packedAlloc, "")
+
+		// End the lifetime of the alloca, to help the optimizer.
+		packedPtr := builder.CreateBitCast(packedAlloc, i8ptrType, "")
+		packedSize := llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(packedAlloc.Type()), false)
+		EmitLifetimeEnd(builder, mod, packedPtr, packedSize)
+
+		return result
+	} else {
+		// Check if the values are all constants.
+		constant := true
+		for _, v := range values {
+			if !v.IsConstant() {
+				constant = false
+				break
+			}
+		}
+
+		if constant {
+			// The data is known at compile time, so store it in a constant global.
+			// The global address is marked as unnamed, which allows LLVM to merge duplicates.
+			global := llvm.AddGlobal(mod, packedType, prefix+"$pack")
+			global.SetInitializer(ctx.ConstStruct(values, false))
+			global.SetGlobalConstant(true)
+			global.SetUnnamedAddr(true)
+			global.SetLinkage(llvm.InternalLinkage)
+			return llvm.ConstBitCast(global, i8ptrType)
+		}
+
+		// Packed data is bigger than a pointer, so allocate it on the heap.
+		sizeValue := llvm.ConstInt(uintptrType, size, false)
+		alloc := mod.NamedFunction("runtime.alloc")
+		packedHeapAlloc := builder.CreateCall(alloc, []llvm.Value{
+			sizeValue,
+			llvm.ConstNull(i8ptrType),
+			llvm.Undef(i8ptrType), // unused context parameter
+		}, "")
+		if needsStackObjects {
+			trackPointer := mod.NamedFunction("runtime.trackPointer")
+			builder.CreateCall(trackPointer, []llvm.Value{
+				packedHeapAlloc,
+				llvm.Undef(i8ptrType), // unused context parameter
+			}, "")
+		}
+		packedAlloc := builder.CreateBitCast(packedHeapAlloc, llvm.PointerType(packedType, 0), "")
+
+		// Store all values in the heap pointer.
+		for i, value := range values {
+			indices := []llvm.Value{
+				llvm.ConstInt(ctx.Int32Type(), 0, false),
+				llvm.ConstInt(ctx.Int32Type(), uint64(i), false),
+			}
+			gep := builder.CreateInBoundsGEP(packedAlloc, indices, "")
+			builder.CreateStore(value, gep)
+		}
+
+		// Return the original heap allocation pointer, which already is an *i8.
+		return packedHeapAlloc
+	}
+}
+
+// EmitPointerUnpack extracts a list of values packed using EmitPointerPack.
+func EmitPointerUnpack(builder llvm.Builder, mod llvm.Module, ptr llvm.Value, valueTypes []llvm.Type) []llvm.Value {
+	ctx := mod.Context()
+	targetData := llvm.NewTargetData(mod.DataLayout())
+	defer targetData.Dispose()
+	i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+	uintptrType := ctx.IntType(targetData.PointerSize() * 8)
+
+	packedType := ctx.StructType(valueTypes, false)
+
+	// Get a correctly-typed pointer to the packed data.
+	var packedAlloc, packedRawAlloc llvm.Value
+	size := targetData.TypeAllocSize(packedType)
+	if size == 0 {
+		// No data to unpack.
+	} else if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.PointerTypeKind {
+		// A single pointer is always stored directly.
+		return []llvm.Value{builder.CreateBitCast(ptr, valueTypes[0], "unpack.ptr")}
+	} else if size <= targetData.TypeAllocSize(i8ptrType) {
+		// Packed data stored directly in pointer.
+		if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.IntegerTypeKind {
+			// Keep this cast in SSA form.
+			return []llvm.Value{builder.CreatePtrToInt(ptr, valueTypes[0], "unpack.int")}
+		}
+		// Fallback: load it using an alloca.
+		packedRawAlloc, _, _ = CreateTemporaryAlloca(builder, mod, llvm.PointerType(i8ptrType, 0), "unpack.raw.alloc")
+		packedRawValue := builder.CreateBitCast(ptr, llvm.PointerType(i8ptrType, 0), "unpack.raw.value")
+		builder.CreateStore(packedRawValue, packedRawAlloc)
+		packedAlloc = builder.CreateBitCast(packedRawAlloc, llvm.PointerType(packedType, 0), "unpack.alloc")
+	} else {
+		// Packed data stored on the heap. Bitcast the passed-in pointer to the
+		// correct pointer type.
+		packedAlloc = builder.CreateBitCast(ptr, llvm.PointerType(packedType, 0), "unpack.raw.ptr")
+	}
+	// Load each value from the packed data.
+	values := make([]llvm.Value, len(valueTypes))
+	for i, valueType := range valueTypes {
+		if targetData.TypeAllocSize(valueType) == 0 {
+			// This value has length zero, so there's nothing to load.
+			values[i] = llvm.ConstNull(valueType)
+			continue
+		}
+		indices := []llvm.Value{
+			llvm.ConstInt(ctx.Int32Type(), 0, false),
+			llvm.ConstInt(ctx.Int32Type(), uint64(i), false),
+		}
+		gep := builder.CreateInBoundsGEP(packedAlloc, indices, "")
+		values[i] = builder.CreateLoad(gep, "")
+	}
+	if !packedRawAlloc.IsNil() {
+		allocPtr := builder.CreateBitCast(packedRawAlloc, i8ptrType, "")
+		allocSize := llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(uintptrType), false)
+		EmitLifetimeEnd(builder, mod, allocPtr, allocSize)
+	}
+	return values
+}
--- a/Show More
+++ b/Show More