gcc/testsuite/gcc.dg/pragma-align.c

   1 /* Prove that pragma alignment handling works somewhat. */
   2
   3 /* { dg-do run { target { ! default_packed } } } */
   4
   5 extern void abort (void);
   6
   7 struct {
   8         char one;
   9         long two;
  10 } defaultalign;
  11
  12 #if defined(__LP64__)
  13 #pragma pack(8)
  14 #else
  15 #pragma pack(4)
  16 #endif
  17 struct {
  18         char one;
  19         long two;
  20 } sixteen;
  21
  22 #pragma pack(1)
  23 struct {
  24         char one;
  25         long two;
  26 } two;
  27
  28 #pragma pack(2)
  29 struct {
  30         char one;
  31         long two;
  32 } three;
  33
  34 #pragma pack()
  35 struct {
  36         char one;
  37         long two;
  38 } resetalign;
  39
  40 main()
  41 {
  42         if(sizeof(sixteen) < sizeof(defaultalign)) abort();
  43         if(sizeof(two) >= sizeof(defaultalign)) abort();
  44         if(sizeof(three) <= sizeof(two)) abort();
  45         if(sizeof(resetalign) != sizeof(defaultalign)) abort();
  46         return 0;
  47 }