bitfield.c

#include <stdio.h>

struct teste {

        unsigned int a0 : 1;
        unsigned int a1 : 1;
        unsigned int a2 : 2;
        unsigned int a3 : 4;

};

struct teste1 {

        unsigned int a0 : 1;
        unsigned int a1 : 1;
        unsigned int a2 : 2;
        unsigned int a3 : 4;

} __attribute__((__packed__));

int main(int argc, char *argv[]) {

	struct teste t1;
	struct teste1 t2;

	return 0;
}