1  /* PR c/100920 */
       2  /* Testcase by George Thopas <george.thopas@gmail.com> */
       3  
       4  /* { dg-do compile } */
       5  /* { dg-require-effective-target alloca } */
       6  
       7  #include <stddef.h>
       8  #include <stdlib.h>
       9  #include <string.h>
      10  
      11  #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
      12  #define REV_ENDIANNESS __attribute__((scalar_storage_order("big-endian")))
      13  #else
      14  #define REV_ENDIANNESS __attribute__((scalar_storage_order("little-endian")))
      15  #endif
      16  
      17  struct s_1 {
      18      int val;
      19  } REV_ENDIANNESS;
      20  
      21  typedef struct s_1 t_1;
      22  
      23  struct s_2 {
      24      char val;
      25  } REV_ENDIANNESS;
      26  
      27  typedef struct s_2 t_2;
      28  
      29  struct s12 {
      30      t_1 a[1];
      31      t_2 b[1]; 
      32  } REV_ENDIANNESS;
      33  
      34  typedef struct s12 t_s12;
      35  
      36  union u12 {
      37      t_1 a[1];
      38      t_2 b[1];
      39  } REV_ENDIANNESS;
      40  
      41  typedef union u12 t_u12;
      42  
      43  int main(void)
      44  {
      45    t_s12 *msg1 = __builtin_alloca(10);
      46    t_u12 *msg2 = __builtin_alloca(10);
      47    int same;
      48  
      49    msg1 = malloc (sizeof (t_s12));
      50    msg2 = malloc (sizeof (t_s12));
      51  
      52    memset (msg1, 0, sizeof (t_s12));
      53    memcpy (msg2, msg1, sizeof (t_s12));
      54    same = memcmp (msg1, msg2, sizeof (t_s12));
      55  
      56    return 0;
      57  }