enum_no_warnings.c

/*
 * Example compilation:
 * gcc enum_no_warnings.c -std=c99 -Wall -Wextra -Wconversion
 */

enum food {
	BANANA = 1,
	CARROT = 2,
	ORANGE = 3
};

enum food foobar(enum food f) {
	if (f == BANANA) {
		return ORANGE;
	}

	/* No warning for returning non-enum value */
	return 77;
}

int main(void) {
	/* No warning for passing non-enum argument */
	foobar(55);

	return 0;
}