main.c

不用sizeof

#define OFFSET(type, var) &(((type*)0)->var)

typedef struct toy_st toy_t;

struct toy_st
{
	void* addr0[8];
	void* addr8;
};

int main(int argc, char* argv[])
{
	int s = (int)OFFSET(toy_t, addr8);
	return 0;
}