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cmd/cgo: add C declaration parameter unused attribute

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Fixes #71225

Change-Id: I3e60fdf632f2aa0e63b24225f13e4ace49906925
Reviewed-on: https://go-review.googlesource.com/c/go/+/642196
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2025-01-10 16:22:20 -08:00 committed by Gopher Robot
parent 9d6af4082b
commit bf351677c4
2 changed files with 20 additions and 1 deletions
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2
src/cmd/cgo/out.go
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@ -1094,7 +1094,7 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
// This unpacks the argument struct above and calls the Go function.
fmt.Fprintf(fgo2, "func _cgoexp%s_%s(a *%s) {\n", cPrefix, exp.ExpName, gotype)
fmt.Fprintf(fm, "void _cgoexp%s_%s(void* p){}\n", cPrefix, exp.ExpName)
fmt.Fprintf(fm, "void _cgoexp%s_%s(void* p __attribute__((unused))){}\n", cPrefix, exp.ExpName)
fmt.Fprintf(fgo2, "\t")

19
test/fixedbugs/issue71225.go Normal file
View File

@ -0,0 +1,19 @@
// build
//go:build cgo
// Copyright 2025 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
// #cgo CFLAGS: -Werror -Wunused-parameter
import "C"
func main() {
}
//export Fn
func Fn() {
}