gcc-4.4.0/gcc/testsuite/gcc.dg/bitfld-15.c

/* { dg-do compile } */
/* Remove pedantic.  Allow the GCC extension to use char for bitfields.  */
/* { dg-options "" } */

struct t
{
  char a:4;
  char b:8;
  char c:4;
} __attribute__ ((packed)); /* { dg-message "note: Offset of packed bit-field 'b' has changed in GCC 4.4" "" { target pcc_bitfield_type_matters } } */

int assrt[sizeof (struct t) == 2 ? 1 : -1];