gcc/testsuite/gcc.dg/pr48784-1.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target size32plus } */
   3 /* { dg-options "-fstrict-volatile-bitfields" } */
   4
   5 extern void abort (void);
   6
   7 #pragma pack(1)
   8 volatile struct S0 {
   9    signed a : 7;
  10    unsigned b : 28;  /* b can't be fetched with an aligned 32-bit access, */
  11                      /* but it certainly can be fetched with an unaligned access */
  12 } g = {0,0xfffffff};
  13
  14 int main() {
  15   unsigned b = g.b;
  16   if (b != 0xfffffff)
  17     abort ();
  18   return 0;
  19 }