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cmd/go: for gccgo, look for tool build ID before hashing entire file

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Also fix the key used to store the ID.

This is a significant speedup in cmd/go run time when using an
unreleased toolchain. For example, the TestGoBuildTestOnly cmd/go test
goes from 15 seconds to 1 second.

Change-Id: Ibfd697d55084db059c6b563f70f71f635e935391
Reviewed-on: https://go-review.googlesource.com/c/go/+/194441
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Ian Lance Taylor 2019-09-09 19:54:41 -07:00
parent 5c5f217b63
commit f668573a5e
1 changed files with 9 additions and 4 deletions
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13
src/cmd/go/internal/work/buildid.go
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@ -292,14 +292,19 @@ func (b *Builder) gccgoToolID(name, language string) (string, error) {
exe = lp
}
}
if _, err := os.Stat(exe); err != nil {
return "", fmt.Errorf("%s: can not find compiler %q: %v; output %q", name, exe, err, out)
id, err = buildid.ReadFile(exe)
if err != nil {
return "", err
}
// If we can't find a build ID, use a hash.
if id == "" {
id = b.fileHash(exe)
}
id = b.fileHash(exe)
}
b.id.Lock()
b.toolIDCache[name] = id
b.toolIDCache[key] = id
b.id.Unlock()
return id, nil