t.Parallel()
	switch runtime.GOOS {
	case "windows", "plan9", "android", "ios", "openbsd": // no getcontext
		t.Skipf("skipping test on %s", runtime.GOOS)
	}
	got := runTestProg(t, "testprogcgo", "StackSwitchCallback")
	skip := "SKIP\n"
	if got == skip {
		t.Skip("skipping on musl/bionic libc")
	}
	want := "OK\n"
	if got != want {
		t.Errorf("expected %q, got %v", want, got)
	}