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https://github.com/tinygo-org/tinygo.git
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Damian Gryski
6203b624c5
Written entirely by Claude (Anthropic's Claude Code), at the request of and under the direction of dgryski, as part of an effort to get TinyGo building against upcoming LLVM releases (this branch currently targets LLVM 22, verified against real LLVM 22.1.8; a corresponding go-llvm branch of the same name adds the matching binding support). LLVM 21 replaced the boolean 'nocapture' enum attribute with the more expressive 'captures' int attribute, where captures(none) (value 0) is the equivalent of the old nocapture. This matters for transform.OptimizeAllocs, which relies on reading this attribute for its interprocedural escape analysis, and for compiler/symbol.go, which emits it on a number of runtime/generated functions. Confirmed empirically (via `opt -passes=function-attrs`) that the cutoff is LLVM 20 emits/expects nocapture, LLVM 21+ emits/expects captures(none). Since TinyGo must keep working with LLVM 20, both sites now go through new version-gated helpers in compiler/llvmutil (NoCaptureAttrName/IsNoCapture) rather than switching unconditionally. Also fixes a second, unrelated but load-bearing break found while testing against LLVM 22: llvm.lifetime.start/end dropped their i64 size argument (confirmed via `opt -passes=verify`, the cutoff here is one version later, at LLVM 22). compiler/llvmutil now builds the right call signature based on version. Adds llvm21 and llvm22 build-tag config files to the cgo package, which parses cgo fragments via libclang and had never been updated past LLVM 20 even though the compiler package itself already gained LLVM 21 support previously -- a latent gap that would have caused a version mismatch between the cgo preprocessor and the rest of the compiler when building with -tags llvm21 or llvm22. Finally, updates the golden-IR test comparators in transform/transform_test.go and compiler/compiler_test.go to normalize a few cosmetic LLVM 21/22 output differences (the captures(none) rename/reordering, a new 'nocreateundeforpoison' intrinsic attribute, and the lifetime intrinsic arity change) so a single golden file continues to match output from either LLVM version. Verified by building a full (non-byollvm) tinygo binary against real LLVM 22.1.8 and running a compiled Go program end-to-end (exercising OptimizeAllocs' stack-allocation path), and by running the transform/compiler/cgo test suites against both LLVM 20 (default) and LLVM 22. Not yet addressed: the byollvm embedded-clang/lld build path hits separate, unrelated Clang C++ API breakage against LLVM 22 (DiagnosticOptions reference-to-pointer change, missing headers) -- that is a larger follow-up effort.
16 lines
684 B
Go
16 lines
684 B
Go
//go:build !byollvm && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm21 && !llvm22
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package cgo
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/*
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#cgo linux CFLAGS: -I/usr/include/llvm-20 -I/usr/include/llvm-c-20 -I/usr/lib/llvm-20/include -I/usr/lib64/llvm20/include
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#cgo darwin,amd64 CFLAGS: -I/usr/local/opt/llvm@20/include
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#cgo darwin,arm64 CFLAGS: -I/opt/homebrew/opt/llvm@20/include
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#cgo freebsd CFLAGS: -I/usr/local/llvm20/include
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#cgo linux LDFLAGS: -L/usr/lib/llvm-20/lib -lclang
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#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@20/lib -lclang
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#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@20/lib -lclang
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#cgo freebsd LDFLAGS: -L/usr/local/llvm20/lib -lclang
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*/
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import "C"
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