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cmd/go: don't add C compiler ID to hash for standard library
No test because a real test requires installing two different compilers. For #40042 For #47251 Change-Id: Iefddd67830d242a119378b7ce20be481904806e4 Reviewed-on: https://go-review.googlesource.com/c/go/+/335409 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com> Reviewed-by: Jay Conrod <jayconrod@google.com>
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@ -2848,3 +2848,35 @@ func TestExecInDeletedDir(t *testing.T) {
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// `go version` should not fail
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tg.run("version")
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}
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// A missing C compiler should not force the net package to be stale.
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// Issue 47215.
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func TestMissingCC(t *testing.T) {
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if !canCgo {
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t.Skip("test is only meaningful on systems with cgo")
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}
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cc := os.Getenv("CC")
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if cc == "" {
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cc = "gcc"
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}
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if filepath.IsAbs(cc) {
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t.Skipf(`"CC" (%s) is an absolute path`, cc)
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}
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_, err := exec.LookPath(cc)
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if err != nil {
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t.Skipf(`"CC" (%s) not on PATH`, cc)
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}
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tg := testgo(t)
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defer tg.cleanup()
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netStale, _ := tg.isStale("net")
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if netStale {
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t.Skip(`skipping test because "net" package is currently stale`)
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}
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tg.setenv("PATH", "") // No C compiler on PATH.
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netStale, _ = tg.isStale("net")
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if netStale {
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t.Error(`clearing "PATH" causes "net" to be stale`)
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}
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}
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@ -252,8 +252,15 @@ func (b *Builder) buildActionID(a *Action) cache.ActionID {
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ccExe := b.ccExe()
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fmt.Fprintf(h, "CC=%q %q %q %q\n", ccExe, cppflags, cflags, ldflags)
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if ccID, err := b.gccToolID(ccExe[0], "c"); err == nil {
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fmt.Fprintf(h, "CC ID=%q\n", ccID)
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// Include the C compiler tool ID so that if the C
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// compiler changes we rebuild the package.
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// But don't do that for standard library packages like net,
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// so that the prebuilt .a files from a Go binary install
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// don't need to be rebuilt with the local compiler.
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if !p.Standard {
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if ccID, err := b.gccToolID(ccExe[0], "c"); err == nil {
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fmt.Fprintf(h, "CC ID=%q\n", ccID)
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}
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}
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if len(p.CXXFiles)+len(p.SwigCXXFiles) > 0 {
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cxxExe := b.cxxExe()
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