gistfile1.txt

> cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

int
main(int argc, char **argv) {
	struct {
		int foo:1;
	} a;

	a.foo = 1;
	printf("%d\n", a.foo);
	if (a.foo == 1)
		printf("It's 1\n");

	exit(0);
}

> cc test.c -o foo
> ./foo
-1
>