gcc/testsuite/gcc.dg/sso-14.c

   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 }