/* Force a compilation error if condition is true */
#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))

/* Force a compilation error if condition is true, but also produce a
   result (of value 0 and type size_t), so the expression can be used
   e.g. in a structure initializer (or where-ever else comma expressions
   aren't permitted). */
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))

struct branch {
	unsigned char opcode;
	int delta;
} __attribute__((packed));

unsigned paravirt_patch_call(void *insnbuf)
{
	struct branch *b = insnbuf;

	b->opcode = 0xe8; /* call */
	b->delta = 0x1234;
	BUILD_BUG_ON(sizeof(*b) != 5);

	return 5;
}

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