// MustHaveCGO calls t.Skip if cgo is not available.
func MustHaveCGO(t testing.TB) {
	if !HasCGO() {
		t.Skipf("skipping test: no cgo")
	}
}

// CanInternalLink reports whether the current system can link programs with
// internal linking.
func CanInternalLink(withCgo bool) bool {
	return !platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, withCgo)
}

		}
		if string(out) != "hello\n" && string(out) != "hello\r\n" {
			t.Errorf("unexpected output (%s):\n%s", mode, out)
		}

		// Test internal linking mode.

		if !testenv.CanInternalLink(true) {
			continue
		}
		cmd = testenv.Command(t, testenv.GoToolPath(t), "build", "-buildmode="+mode, "-ldflags=-debugtramp=2 -linkmode=internal", "-o", exe, src)
		out, err = cmd.CombinedOutput()
		if err != nil {