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cmd/cgo: silence two gcc warnings for *.cgo2.c

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1. "int e;" is unused, generating "unused variable" error.
2. a->e was typed void *[2], but was accessed with *(int *)(a->e), this
generated "dereferencing type-punned pointer will break strict-aliasing rules" error.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/11009043
This commit is contained in:
Shenghou Ma 2013-07-12 04:35:53 +08:00
parent 72faa4bc51
commit 2a983aa311
1 changed files with 2 additions and 3 deletions
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5
src/cmd/cgo/out.go
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@ -47,7 +47,7 @@ func (p *Package) writeDefs() {
} else {
// If we're not importing runtime/cgo, we *are* runtime/cgo,
// which provides crosscall2. We just need a prototype.
fmt.Fprintf(fm, "void crosscall2(void(*fn)(void*, int), void *a, int c);")
fmt.Fprintf(fm, "void crosscall2(void(*fn)(void*, int), void *a, int c);\n")
}
fmt.Fprintf(fm, "void _cgo_allocate(void *a, int c) { }\n")
fmt.Fprintf(fm, "void _cgo_panic(void *a, int c) { }\n")
@ -282,7 +282,7 @@ func (p *Package) structType(n *Name) (string, int64) {
off += pad
}
if n.AddError {
fmt.Fprint(&buf, "\t\tvoid *e[2]; /* error */\n")
fmt.Fprint(&buf, "\t\tint e[2*sizeof(void *)/sizeof(int)]; /* error */\n")
off += 2 * p.PtrSize
}
if off == 0 {
@ -478,7 +478,6 @@ func (p *Package) writeOutputFunc(fgcc *os.File, n *Name) {
fmt.Fprintf(fgcc, "_cgo%s%s(void *v)\n", cPrefix, n.Mangle)
fmt.Fprintf(fgcc, "{\n")
if n.AddError {
fmt.Fprintf(fgcc, "\tint e;\n") // assuming 32 bit (see comment above structType)
fmt.Fprintf(fgcc, "\terrno = 0;\n")
}
// We're trying to write a gcc struct that matches 6c/8c/5c's layout.