// or else the commands will rebuild any needed packages (like runtime)
// over and over.
func (test) goGcflags() string {
	return "-gcflags=all=" + os.Getenv("GO_GCFLAGS")
}

func (test) goGcflagsIsEmpty() bool {
	return "" == os.Getenv("GO_GCFLAGS")
}

var errTimeout = errors.New("command exceeded time limit")

// run runs the test case.
//