gcc/testsuite/gcc.dg/i386-bitfield2.c

   1 // Test for bitfield alignment in structs on IA-32
   2 // { dg-do run { target i?86-*-* } }
   3 /* { dg-skip-if "" { i?86-*-* } { "-m64" } { "" } } */
   4 // { dg-options "-O2" }
   5 // { dg-options "-mno-align-double -mno-ms-bitfields" { target i?86-*-interix* i?86-*-cygwin* i?86-*-mingw* } }
   6
   7 extern void abort (void);
   8 extern void exit (int);
   9
  10 struct X {
  11   char a;
  12   long long : 0;
  13   char b;
  14 } x;
  15
  16 int main () {
  17   if (&x.b - &x.a != 4)
  18     abort ();
  19   if (sizeof (x) != 5)
  20     abort ();
  21
  22   exit (0);
  23 }