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cmd/go: cgo for Linux/ARM
Part 4 of CL 5601044 (cgo: Linux/ARM support) R=golang-dev, dave, rsc CC=golang-dev https://golang.org/cl/5989058
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@ -1394,6 +1394,8 @@ func (b *builder) gccCmd(objdir string) []string {
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a = append(a, "-m32")
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case "6":
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a = append(a, "-m64")
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case "5":
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a = append(a, "-marm") // not thumb
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}
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// gcc-4.5 and beyond require explicit "-pthread" flag
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// for multithreading with pthread library.
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@ -1513,9 +1515,15 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, gccfiles []string) (outGo,
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outObj = append(outObj, ofile)
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}
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dynobj := obj + "_cgo_.o"
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if goarch == "arm" && goos == "linux" { // we need to use -pie for Linux/ARM to get accurate imported sym
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cgoLDFLAGS = append(cgoLDFLAGS, "-pie")
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}
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if err := b.gccld(p, dynobj, cgoLDFLAGS, linkobj); err != nil {
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return nil, nil, err
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}
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if goarch == "arm" && goos == "linux" { // but we don't need -pie for normal cgo programs
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cgoLDFLAGS = cgoLDFLAGS[0 : len(cgoLDFLAGS)-1]
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}
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if _, ok := buildToolchain.(gccgcToolchain); ok {
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// we don't use dynimport when using gccgo.
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