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cmd/go: make sure the linker for shared doesn't include tempdir path

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This is similar to CL 478196 and CL 477296,
but this is for -buildmode=shared.

When using "go install -buildmode=shared std",
because the gold linker is used by default on Linux arm64,
it will cause temporary paths to be included in libstd.so.

Based on the changes of CL 478196,
I speculate that this may also have issues on other platforms.
So, this change is for all platform.

But I don't have any other platforms and
don't know what the file name for verification,
so the testcase are only for the Linux platform.
I hope someone can improve this testcase. Thanks!

Fixes #69464
This commit is contained in:
zhangjian 2024-09-11 21:41:55 +08:00
parent 165bf241f2
commit ee40cf81ac
2 changed files with 25 additions and 1 deletions
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16
src/cmd/go/internal/work/gc.go
View File

@ -714,7 +714,21 @@ func (gcToolchain) ldShared(b *Builder, root *Action, toplevelactions []*Action,
}
ldflags = append(ldflags, d.Package.ImportPath+"="+d.Target)
}
return b.Shell(root).run(".", targetPath, nil, cfg.BuildToolexec, base.Tool("link"), "-o", targetPath, "-importcfg", importcfg, ldflags)
// On OS X when using external linking to build a shared library,
// the argument passed here to -o ends up recorded in the final
// shared library in the LC_ID_DYLIB load command.
// To avoid putting the temporary output directory name there
// (and making the resulting shared library useless),
// run the link in the output directory so that -o can name
// just the final path element.
// On Windows, DLL file name is recorded in PE file
// export section, so do like on OS X.
// On Linux, for a shared object, at least with the Gold linker,
// the output file path is recorded in the .gnu.version_d section.
dir, targetPath := filepath.Split(targetPath)
return b.Shell(root).run(dir, targetPath, nil, cfg.BuildToolexec, base.Tool("link"), "-o", targetPath, "-importcfg", importcfg, ldflags)
}
func (gcToolchain) cc(b *Builder, a *Action, ofile, cfile string) error {

10
src/cmd/go/testdata/script/build_shared_reproducible.txt vendored Normal file
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@ -0,0 +1,10 @@
[!buildmode:shared] skip
[short] skip
[!cgo] skip '-buildmode=shared requires external linking'
[!GOOS:linux] skip
env GO111MODULE=off
env CGO_ENABLED=1
go install -a -trimpath -buildvcs=false -buildmode=shared -pkgdir=pkgdir1 runtime
go install -a -trimpath -buildvcs=false -buildmode=shared -pkgdir=pkgdir2 runtime
[GOOS:linux] cmp -q pkgdir1/libruntime.so pkgdir2/libruntime.so