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[dev.fuzz] internal/fuzz: improve warning message when not instrumented 

Change-Id: I005f66c965014b699de7e22750f417b28a32c03f
Reviewed-on: https://go-review.googlesource.com/c/go/+/349052
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Katie Hockman 2021-09-10 09:49:03 -04:00
parent 7c648e2acb
commit 213d9f9a38
1 changed files with 1 additions and 5 deletions
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6
src/internal/fuzz/fuzz.go
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@ -613,11 +613,7 @@ func newCoordinator(opts CoordinateFuzzingOpts) (*coordinator, error) {
covSize := len(coverage())
if covSize == 0 {
// TODO: improve this warning. This condition happens if the binary was
// built without fuzzing instrumtation (e.g., with 'go test -c'), so the
// warning may not be true.
fmt.Fprintf(c.opts.Log, "warning: coverage-guided fuzzing is not supported on this platform\n")
c.covOnlyInputs = 0
fmt.Fprintf(c.opts.Log, "warning: the test binary was not built with coverage instrumentation, so fuzzing will run without coverage guidance and may be inefficient\n")
} else {
// Set c.coverageData to a clean []byte full of zeros.
c.coverageMask = make([]byte, covSize)