1  struct c {
       2    double a;
       3  } __attribute((packed)) __attribute((aligned));
       4  
       5  extern void abort(void);
       6  
       7  double g_expect = 32.25;
       8  
       9  void f(unsigned x, struct c y)
      10  {
      11    if (x != 0)
      12      abort();
      13  
      14    if (y.a != g_expect)
      15      abort();
      16  }
      17  
      18  struct c e = { 64.25 };
      19  
      20  int main(void)
      21  {
      22    struct c d = { 32.25 };
      23    f(0, d);
      24  
      25    g_expect = 64.25;
      26    f(0, e);
      27    return 0;
      28  }