1  void abort(void);
       2  void exit(int);
       3  struct baz 
       4  {
       5    char a[17];
       6    char b[3];
       7    unsigned int c;
       8    unsigned int d;
       9  };
      10  
      11  void foo(struct baz *p, unsigned int c, unsigned int d)
      12  {
      13    __builtin_memcpy (p->b, "abc", 3);
      14    p->c = c;
      15    p->d = d;
      16  }
      17  
      18  void bar(struct baz *p, unsigned int c, unsigned int d)
      19  {
      20    ({ void *s = (p);
      21       __builtin_memset (s, '\0', sizeof (struct baz));
      22       s; });
      23    __builtin_memcpy (p->a, "01234567890123456", 17);
      24    __builtin_memcpy (p->b, "abc", 3);
      25    p->c = c;
      26    p->d = d;
      27  }
      28  
      29  int main()
      30  {
      31    struct baz p;
      32    foo(&p, 71, 18);
      33    if (p.c != 71 || p.d != 18)
      34      abort();
      35    bar(&p, 59, 26);
      36    if (p.c != 59 || p.d != 26)
      37      abort();
      38    exit(0);
      39  }