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GNUmakefile: split into topic files in make/
The GNUmakefile had 1295 lines and mixed build configuration, LLVM bootstrapping, device generation, four test suites, the smoke tests, release packaging, and lint tools. The smoke tests alone were 500 lines. Move each part into its own file in make/ and include them from GNUmakefile. config.mk must be included first because the other files use its variables in immediate assignments and conditionals. There is no change in behavior. The parsed make database is identical for the default build and for ASSERT=1, STATIC=1, XTENSA=0, STM32=0, WASM=0, and CROSS=aarch64-linux-gnu, except for MAKEFILE_LIST and the .PHONY list, which now also includes targets that were phony but not declared. The Dockerfile copies GNUmakefile alone before it builds LLVM, to keep that layer independent of the source tree. It must copy make/ too.
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# Build configuration: host detection, LLVM paths, and CGO flags.
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# Default build and source directories, as created by `make llvm-build`.
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LLVM_BUILDDIR ?= llvm-build
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LLVM_PROJECTDIR ?= llvm-project
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CLANG_SRC ?= $(LLVM_PROJECTDIR)/clang
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LLD_SRC ?= $(LLVM_PROJECTDIR)/lld
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ifeq ($(OS),Windows_NT)
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# avoid calling uname on Windows
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uname := Windows_NT
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else
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uname := $(shell uname -s)
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endif
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# Try to autodetect LLVM build tools.
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# Versions are listed here in descending priority order.
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LLVM_VERSIONS = 19 18 17 16 15
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errifempty = $(if $(1),$(1),$(error $(2)))
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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)))
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toolSearchPathsVersion = $(1)-$(2)
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ifeq ($(uname),Darwin)
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# Also explicitly search Brew's copy, which is not in PATH by default.
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BREW_PREFIX := $(shell brew --prefix)
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toolSearchPathsVersion += $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)-$(2) $(BREW_PREFIX)/opt/llvm@$(2)/bin/$(1)
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endif
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# First search for a custom built copy, then move on to explicitly version-tagged binaries, then just see if the tool is in path with its normal name.
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findLLVMTool = $(call detect,$(1),$(abspath llvm-build/bin/$(1)) $(foreach ver,$(LLVM_VERSIONS),$(call toolSearchPathsVersion,$(1),$(ver))) $(1))
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CLANG ?= $(call findLLVMTool,clang)
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LLVM_AR ?= $(call findLLVMTool,llvm-ar)
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LLVM_NM ?= $(call findLLVMTool,llvm-nm)
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# Go binary and GOROOT to select
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GO ?= go
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# Flags to pass to go test.
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GOTESTFLAGS ?=
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GOTESTPKGS ?= ./builder ./cgo ./compileopts ./compiler ./interp ./transform .
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# tinygo binary for tests
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TINYGO ?= $(call detect,tinygo,tinygo $(CURDIR)/build/tinygo)
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# Check for ccache if the user hasn't set it to on or off.
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ifeq (, $(CCACHE))
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LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(if $(shell command -v ccache 2> /dev/null),ON,OFF)'
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else
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LLVM_OPTION += '-DLLVM_CCACHE_BUILD=$(CCACHE)'
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endif
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# Allow enabling LLVM assertions
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ifeq (1, $(ASSERT))
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LLVM_OPTION += '-DLLVM_ENABLE_ASSERTIONS=ON'
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else
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LLVM_OPTION += '-DLLVM_ENABLE_ASSERTIONS=OFF'
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endif
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# Enable AddressSanitizer
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ifeq (1, $(ASAN))
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LLVM_OPTION += -DLLVM_USE_SANITIZER=Address
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CGO_LDFLAGS += -fsanitize=address
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endif
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ifeq (1, $(STATIC))
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# Build TinyGo as a fully statically linked binary (no dynamically loaded
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# libraries such as a libc). This is not supported with glibc which is used
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# on most major Linux distributions. However, it is supported in Alpine
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# Linux with musl.
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CGO_LDFLAGS += -static
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# Also set the thread stack size to 1MB. This is necessary on musl as the
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# default stack size is 128kB and LLVM uses more than that.
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# For more information, see:
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# https://wiki.musl-libc.org/functional-differences-from-glibc.html#Thread-stack-size
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CGO_LDFLAGS += -Wl,-z,stack-size=1048576
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# Build wasm-opt with static linking.
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# For details, see:
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# https://github.com/WebAssembly/binaryen/blob/version_102/.github/workflows/ci.yml#L181
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BINARYEN_OPTION += -DCMAKE_CXX_FLAGS="-static" -DCMAKE_C_FLAGS="-static"
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endif
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# Optimize the binary size for Linux.
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# These flags may work on other platforms, but have only been tested on Linux.
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ifeq ($(uname),Linux)
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HAS_MOLD := $(shell command -v ld.mold 2> /dev/null)
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HAS_LLD := $(shell command -v ld.lld 2> /dev/null)
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LLVM_CFLAGS := -ffunction-sections -fdata-sections -fvisibility=hidden
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LLVM_LDFLAGS := -Wl,--gc-sections
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ifneq ($(HAS_MOLD),)
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# Mold might be slightly faster.
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LLVM_LDFLAGS += -fuse-ld=mold -Wl,--icf=all
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else ifneq ($(HAS_LLD),)
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# LLD is more commonly available.
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LLVM_LDFLAGS += -fuse-ld=lld -Wl,--icf=all
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endif
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LLVM_OPTION += \
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-DCMAKE_C_FLAGS="$(LLVM_CFLAGS)" \
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-DCMAKE_CXX_FLAGS="$(LLVM_CFLAGS)"
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CGO_LDFLAGS += $(LLVM_LDFLAGS)
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endif
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# Cross compiling support.
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ifneq ($(CROSS),)
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CC = $(CROSS)-gcc
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CXX = $(CROSS)-g++
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LLVM_OPTION += \
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-DCMAKE_C_COMPILER=$(CC) \
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-DCMAKE_CXX_COMPILER=$(CXX) \
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-DLLVM_DEFAULT_TARGET_TRIPLE=$(CROSS) \
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-DCROSS_TOOLCHAIN_FLAGS_NATIVE="-UCMAKE_C_COMPILER;-UCMAKE_CXX_COMPILER"
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ifeq ($(CROSS), arm-linux-gnueabihf)
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# Assume we're building on a Debian-like distro, with QEMU installed.
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LLVM_CONFIG_PREFIX = qemu-arm -L /usr/arm-linux-gnueabihf/
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# The CMAKE_SYSTEM_NAME flag triggers cross compilation mode.
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LLVM_OPTION += \
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-DCMAKE_SYSTEM_NAME=Linux \
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-DLLVM_TARGET_ARCH=ARM
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GOENVFLAGS = GOARCH=arm CC=$(CC) CXX=$(CXX) CGO_ENABLED=1
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BINARYEN_OPTION += -DCMAKE_C_COMPILER=$(CC) -DCMAKE_CXX_COMPILER=$(CXX)
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else ifeq ($(CROSS), aarch64-linux-gnu)
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# Assume we're building on a Debian-like distro, with QEMU installed.
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LLVM_CONFIG_PREFIX = qemu-aarch64 -L /usr/aarch64-linux-gnu/
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# The CMAKE_SYSTEM_NAME flag triggers cross compilation mode.
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LLVM_OPTION += \
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-DCMAKE_SYSTEM_NAME=Linux \
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-DLLVM_TARGET_ARCH=AArch64
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GOENVFLAGS = GOARCH=arm64 CC=$(CC) CXX=$(CXX) CGO_ENABLED=1
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BINARYEN_OPTION += -DCMAKE_C_COMPILER=$(CC) -DCMAKE_CXX_COMPILER=$(CXX)
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else
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$(error Unknown cross compilation target: $(CROSS))
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endif
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endif
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