gcc/testsuite/gcc.dg/bitfld-4.c

   1 /* { dg-do run } */
   2 /* { dg-options "" } */
   3
   4 /* Check bitfields and non-bitfields are aligned & sized similarly.
   5
   6    Copyright (C) 2002 Free Software Foundation Inc
   7    Contributed by Nathan Sidwell <nathan@codesourcery.com>
   8 */
   9
  10 #include <limits.h>
  11 #include <stdio.h>
  12
  13 static int fail;
  14
  15 #define CHECK1(N, T) do { \
  16   typedef struct Field_##N { char c; T f; } Field_##N; \
  17   typedef struct BitField_##N { char c; T f : sizeof (T) * CHAR_BIT; } BitField_##N; \
  18   if (sizeof (Field_##N) != sizeof (BitField_##N)) { \
  19     fail = 1; printf ("sizeof %s failed\n", #T); \
  20   } \
  21   if (__alignof__ (Field_##N) != __alignof__ (BitField_##N)) { \
  22     fail = 1; printf ("__alignof__ %s failed\n", #T); \
  23   } \
  24 } while (0)
  25
  26 #define CHECK(N, T) do { \
  27   CHECK1(N, T); \
  28   CHECK1 (s##N, signed T); \
  29   CHECK1 (u##N, unsigned T); \
  30 } while (0)
  31
  32 int main ()
  33 {
  34
  35   CHECK (c, char);
  36   CHECK (s, short);
  37   CHECK (i, int);
  38   CHECK (l, long);
  39   CHECK (ll, long long);
  40
  41   return fail;
  42 }