gcc/testsuite/gcc.c-torture/execute/20010518-2.c

   1 /* Mis-aligned packed structures.  */
   2
   3 typedef struct
   4 {
   5   char b0;
   6   char b1;
   7   char b2;
   8   char b3;
   9   char b4;
  10   char b5;
  11 } __attribute__ ((packed)) b_struct;
  12
  13
  14 typedef struct
  15 {
  16   short a;
  17   long b;
  18   short c;
  19   short d;
  20   b_struct e;
  21 } __attribute__ ((packed)) a_struct;
  22
  23
  24 int
  25 main(void)
  26 {
  27   volatile a_struct *a;
  28   volatile a_struct b;
  29
  30   a = &b;
  31   *a = (a_struct){1,2,3,4};
  32   a->e.b4 = 'c';
  33
  34   if (a->a != 1 || a->b != 2 || a->c != 3 || a->d != 4 || a->e.b4 != 'c')
  35     abort ();
  36
  37   exit (0);
  38 }