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cmd/cgo: fix unaligned arguments typedmemmove crash on iOS #74868

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timcooijmans wants to merge 1 commit into golang:master

from timcooijmans:feature/fix-unaligned-arguments

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cmd/cgo: fix unaligned arguments typedmemmove crash on iOS #74868

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cmd/cgo: fix unaligned arguments typedmemmove crash on iOS

timcooijmans Aug 4, 2025

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2 changes: 1 addition & 1 deletion src/cmd/cgo/out.go

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -1051,7 +1051,7 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
		// string.h for memset, and is also robust to C++
		// types with constructors. Both GCC and LLVM optimize
		// this into just zeroing _cgo_a.
	fmt.Fprintf(fgcc, "\ttypedef %s %v _cgo_argtype;\n", ctype.String(), p.packedAttribute())
	fmt.Fprintf(fgcc, "\ttypedef %s %v __attribute__((aligned(%d))) _cgo_argtype;\n", ctype.String(), p.packedAttribute(), p.PtrSize)
		fmt.Fprintf(fgcc, "\tstatic _cgo_argtype _cgo_zero;\n")
		fmt.Fprintf(fgcc, "\t_cgo_argtype _cgo_a = _cgo_zero;\n")
		if gccResult != "void" && (len(fntype.Results.List) > 1 \|\| len(fntype.Results.List[0].Names) > 1) {
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