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cmd/go: warn on -race with -covermode=set.
Fixes #20435. Change-Id: I15576f36b26d01642c1187325baea82d3077e578 Reviewed-on: https://go-review.googlesource.com/43777 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -4120,3 +4120,21 @@ func TestCgoFlagContainsSpace(t *testing.T) {
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tg.cd(tg.path("src/cgo"))
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tg.cd(tg.path("src/cgo"))
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tg.run("run", "main.go")
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tg.run("run", "main.go")
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}
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}
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// Issue #20435.
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func TestGoTestRaceCoverModeFailures(t *testing.T) {
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if !canRace {
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t.Skip("skipping because race detector not supported")
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}
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tg := testgo(t)
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tg.parallel()
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defer tg.cleanup()
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tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
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tg.run("test", "testrace")
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tg.runFail("test", "-race", "-covermode=set", "testrace")
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tg.grepStderr(`-covermode must be "atomic", not "set", when -race is enabled`, "-race -covermode=set was allowed")
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tg.grepBothNot("PASS", "something passed")
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}
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@ -193,6 +193,10 @@ func testFlags(args []string) (packageNames, passToTest []string) {
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}
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}
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}
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}
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if cfg.BuildRace && testCoverMode != "atomic" {
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base.Fatalf(`-covermode must be "atomic", not %q, when -race is enabled`, testCoverMode)
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}
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// Tell the test what directory we're running in, so it can write the profiles there.
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// Tell the test what directory we're running in, so it can write the profiles there.
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if testProfile && outputDir == "" {
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if testProfile && outputDir == "" {
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dir, err := os.Getwd()
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dir, err := os.Getwd()
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