1  /* The bit-field below would have a problem if __INT_MAX__ is too
       2     small.  */
       3  #if __INT_MAX__ < 2147483647
       4  int
       5  main (void)
       6  {
       7    exit (0);
       8  }
       9  #else
      10  typedef struct {
      11    unsigned b0:1, f1:17, b18:1, b19:1, b20:1, f2:11;
      12  } bf;
      13  
      14  typedef union {
      15    bf b;
      16    unsigned w;
      17  } bu;
      18  
      19  bu
      20  f(bu i)
      21  {
      22    bu o = i;
      23  
      24    if (o.b.b0)
      25      o.b.b18 = 1,
      26      o.b.b20 = 1;
      27    else
      28      o.b.b18 = 0,
      29      o.b.b20 = 0;
      30  
      31    return o;
      32  }
      33  
      34  main()
      35  {
      36    bu a;
      37    bu r;
      38  
      39    a.w = 0x4000000;
      40    a.b.b0 = 0;
      41    r = f(a);
      42    if (a.w != r.w)
      43      abort();
      44    exit(0);
      45  }
      46  #endif