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cmd/go: don't add C compiler ID to hash for standard library

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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>
This commit is contained in:
Ian Lance Taylor 2021-07-18 13:58:13 -07:00
parent d568e6e075
commit 9e26569293
2 changed files with 41 additions and 2 deletions
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32
src/cmd/go/go_test.go
View File

@ -2848,3 +2848,35 @@ func TestExecInDeletedDir(t *testing.T) {
// `go version` should not fail
tg.run("version")
}
// A missing C compiler should not force the net package to be stale.
// Issue 47215.
func TestMissingCC(t *testing.T) {
if !canCgo {
t.Skip("test is only meaningful on systems with cgo")
}
cc := os.Getenv("CC")
if cc == "" {
cc = "gcc"
}
if filepath.IsAbs(cc) {
t.Skipf(`"CC" (%s) is an absolute path`, cc)
}
_, err := exec.LookPath(cc)
if err != nil {
t.Skipf(`"CC" (%s) not on PATH`, cc)
}
tg := testgo(t)
defer tg.cleanup()
netStale, _ := tg.isStale("net")
if netStale {
t.Skip(`skipping test because "net" package is currently stale`)
}
tg.setenv("PATH", "") // No C compiler on PATH.
netStale, _ = tg.isStale("net")
if netStale {
t.Error(`clearing "PATH" causes "net" to be stale`)
}
}

11
src/cmd/go/internal/work/exec.go
View File

@ -252,8 +252,15 @@ func (b *Builder) buildActionID(a *Action) cache.ActionID {
ccExe := b.ccExe()
fmt.Fprintf(h, "CC=%q %q %q %q\n", ccExe, cppflags, cflags, ldflags)
if ccID, err := b.gccToolID(ccExe[0], "c"); err == nil {
fmt.Fprintf(h, "CC ID=%q\n", ccID)
// Include the C compiler tool ID so that if the C
// compiler changes we rebuild the package.
// But don't do that for standard library packages like net,
// so that the prebuilt .a files from a Go binary install
// don't need to be rebuilt with the local compiler.
if !p.Standard {
if ccID, err := b.gccToolID(ccExe[0], "c"); err == nil {
fmt.Fprintf(h, "CC ID=%q\n", ccID)
}
}
if len(p.CXXFiles)+len(p.SwigCXXFiles) > 0 {
cxxExe := b.cxxExe()