return;
	}
	CFStringRef url_str_ref = CFURLGetString(url_ref);
	char buf[MAXPATHLEN];
	Boolean res = CFStringGetCString(url_str_ref, buf, sizeof(buf), kCFStringEncodingUTF8);
	CFRelease(url_ref);
	if (!res) {
		fprintf(stderr, "runtime/cgo: cannot get URL string\n");
		return;
	}

	// url is of the form "file:///path/to/Info.plist".
	// strip it down to the working directory "/path/to".