1  struct S {
       2    short int i : 12;
       3    char c1 : 1;
       4    char c2 : 1;
       5    char c3 : 1;
       6    char c4 : 1;
       7  };
       8  
       9  int main (void)
      10  {
      11    struct S s0 = { 341, 1, 1, 1, 1 };
      12    char *p = (char *) &s0;
      13  
      14  #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
      15    if (*p != 85)
      16      __builtin_abort ();
      17  #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
      18    if (*p != 21)
      19      __builtin_abort ();
      20  #endif
      21  
      22    return 0;
      23  }