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cmd/go: invoke gcc -print-libgcc-file-name only once

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6741051
This commit is contained in:
Shenghou Ma 2012-11-07 05:09:54 +08:00
parent 882eb608b1
commit 3e80f9ce7b
1 changed files with 10 additions and 5 deletions
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15
src/cmd/go/build.go
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@ -1541,6 +1541,8 @@ func envList(key string) []string {
var cgoRe = regexp.MustCompile(`[/\\:]`)
var cgoLibGccFile string
func (b *builder) cgo(p *Package, cgoExe, obj string, gccfiles []string) (outGo, outObj []string, err error) {
if goos != toolGOOS {
return nil, nil, errors.New("cannot use cgo when compiling for a different operating system")
@ -1630,16 +1632,19 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, gccfiles []string) (outGo,
bareLDFLAGS = append(bareLDFLAGS, f)
}
}
libgcc, err := b.libgcc(p)
if err != nil {
return nil, nil, err
if cgoLibGccFile == "" {
var err error
cgoLibGccFile, err = b.libgcc(p)
if err != nil {
return nil, nil, err
}
}
var staticLibs []string
if goos == "windows" {
// libmingw32 and libmingwex might also use libgcc, so libgcc must come last
staticLibs = []string{"-lmingwex", "-lmingw32", libgcc}
staticLibs = []string{"-lmingwex", "-lmingw32", cgoLibGccFile}
} else {
staticLibs = []string{libgcc}
staticLibs = []string{cgoLibGccFile}
}
for _, cfile := range cfiles {