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cmd/cgo: using __typeof__(a->r) instead of putting invalid TYPE in "a->r = (const TYPE)"

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Thanks kballard for the hint.
Fixes #4857.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9649045
This commit is contained in:
Shenghou Ma 2013-06-02 22:46:53 +08:00
parent 5a810f7c0a
commit 5b097e7951
2 changed files with 16 additions and 1 deletions
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15
misc/cgo/test/issue4857.go Normal file
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@ -0,0 +1,15 @@
// Copyright 2013 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 cgotest
/*
#cgo CFLAGS: -Werror
const struct { int a; } *issue4857() { return (void *)0; }
*/
import "C"
func test4857() {
_ = C.issue4857()
}

2
src/cmd/cgo/out.go
View File

@ -490,7 +490,7 @@ func (p *Package) writeOutputFunc(fgcc *os.File, n *Name) {
if t := n.FuncType.Result; t != nil { if t := n.FuncType.Result; t != nil {
fmt.Fprintf(fgcc, "a->r = ") fmt.Fprintf(fgcc, "a->r = ")
if c := t.C.String(); c[len(c)-1] == '*' { if c := t.C.String(); c[len(c)-1] == '*' {
fmt.Fprintf(fgcc, "(const %s) ", t.C) fmt.Fprint(fgcc, "(__typeof__(a->r)) ")
} }
} }
fmt.Fprintf(fgcc, "%s(", n.C) fmt.Fprintf(fgcc, "%s(", n.C)