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[dev.link] all: merge branch 'master' into dev.link

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Clean merge.

Change-Id: If2280b25fedfea9aca8560301cfa54ba4990e47b
This commit is contained in:
Cherry Zhang 2020-05-29 14:50:43 -04:00
commit cdaeaaca92
78 changed files with 2091 additions and 535 deletions
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23
src/cmd/link/internal/ld/lib.go
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@ -1423,6 +1423,7 @@ func (ctxt *Link) hostlink() {
}
}
var altLinker string
if ctxt.IsELF && ctxt.DynlinkingGo() {
// We force all symbol resolution to be done at program startup
// because lazy PLT resolution can use large amounts of stack at
@ -1434,6 +1435,11 @@ func (ctxt *Link) hostlink() {
// from the beginning of the section (like sym.STYPE).
argv = append(argv, "-Wl,-znocopyreloc")
if objabi.GOOS == "android" {
// Use lld to avoid errors from default linker (issue #38838)
altLinker = "lld"
}
if ctxt.Arch.InFamily(sys.ARM, sys.ARM64) && objabi.GOOS == "linux" {
// On ARM, the GNU linker will generate COPY relocations
// even with -znocopyreloc set.
@ -1443,7 +1449,7 @@ func (ctxt *Link) hostlink() {
// generating COPY relocations.
//
// In both cases, switch to gold.
argv = append(argv, "-fuse-ld=gold")
altLinker = "gold"
// If gold is not installed, gcc will silently switch
// back to ld.bfd. So we parse the version information
@ -1456,10 +1462,9 @@ func (ctxt *Link) hostlink() {
}
}
}
if ctxt.Arch.Family == sys.ARM64 && objabi.GOOS == "freebsd" {
// Switch to ld.bfd on freebsd/arm64.
argv = append(argv, "-fuse-ld=bfd")
altLinker = "bfd"
// Provide a useful error if ld.bfd is missing.
cmd := exec.Command(*flagExtld, "-fuse-ld=bfd", "-Wl,--version")
@ -1469,6 +1474,9 @@ func (ctxt *Link) hostlink() {
}
}
}
if altLinker != "" {
argv = append(argv, "-fuse-ld="+altLinker)
}
if ctxt.IsELF && len(buildinfo) > 0 {
argv = append(argv, fmt.Sprintf("-Wl,--build-id=0x%x", buildinfo))
@ -1505,7 +1513,7 @@ func (ctxt *Link) hostlink() {
}
const compressDWARF = "-Wl,--compress-debug-sections=zlib-gnu"
if ctxt.compressDWARF && linkerFlagSupported(argv[0], compressDWARF) {
if ctxt.compressDWARF && linkerFlagSupported(argv[0], altLinker, compressDWARF) {
argv = append(argv, compressDWARF)
}
@ -1595,7 +1603,7 @@ func (ctxt *Link) hostlink() {
if ctxt.BuildMode == BuildModeExe && !ctxt.linkShared {
// GCC uses -no-pie, clang uses -nopie.
for _, nopie := range []string{"-no-pie", "-nopie"} {
if linkerFlagSupported(argv[0], nopie) {
if linkerFlagSupported(argv[0], altLinker, nopie) {
argv = append(argv, nopie)
break
}
@ -1696,7 +1704,7 @@ func (ctxt *Link) hostlink() {
var createTrivialCOnce sync.Once
func linkerFlagSupported(linker, flag string) bool {
func linkerFlagSupported(linker, altLinker, flag string) bool {
createTrivialCOnce.Do(func() {
src := filepath.Join(*flagTmpdir, "trivial.c")
if err := ioutil.WriteFile(src, []byte("int main() { return 0; }"), 0666); err != nil {
@ -1756,6 +1764,9 @@ func linkerFlagSupported(linker, flag string) bool {
}
}
if altLinker != "" {
flags = append(flags, "-fuse-ld="+altLinker)
}
flags = append(flags, flag, "trivial.c")
cmd := exec.Command(linker, flags...)