validation/packed-struct.c

   1 #define __packed __attribute__((packed))
   2
   3 typedef unsigned char   u8;
   4 typedef __UINT16_TYPE__ u16;
   5 typedef __UINT32_TYPE__ u32;
   6 typedef __UINT64_TYPE__ u64;
   7
   8 struct a {
   9         u8 a;
  10         u8 b;
  11         u16 c;
  12 } __packed;
  13 _Static_assert(__alignof(struct a) == 1, "align struct");
  14 _Static_assert(   sizeof(struct a) == 4, " size struct");
  15
  16 struct b {
  17         u32     a;
  18         u32     b;
  19 } __packed;
  20 _Static_assert(__alignof(struct b) == 1, "align struct");
  21 _Static_assert(   sizeof(struct b) == 8, "size struct");
  22
  23 struct c {
  24         u16     a;
  25         u32     b;
  26 } __packed;
  27 _Static_assert(__alignof(struct c) == 1, "align struct");
  28 _Static_assert(   sizeof(struct c) == 6, "size struct");
  29
  30 /*
  31  * check-name: packed-struct
  32  */