gcc/testsuite/c-c++-common/pr51628-8.c

   1 /* PR c/51628.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O" } */
   4
   5 struct pair_t
   6 {
   7   char x;
   8   int i[4];
   9 } __attribute__ ((packed, aligned (4)));
  10
  11 extern struct pair_t p;
  12 extern int *x;
  13 extern void bar (int *);
  14
  15 int *addr = p.i;
  16 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  17
  18 int *
  19 foo (struct pair_t *p)
  20 {
  21   int *p0, *p1;
  22   p0 = p->i;
  23 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  24   bar (p0);
  25   p1 = &p->i[1];
  26 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  27   bar (p1);
  28   bar (p->i);
  29 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  30   bar (&p->i[2]);
  31 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  32   x = p->i;
  33 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  34   return &p->i[3];
  35 /* { dg-warning "may result in an unaligned pointer value" "" { target { ! default_packed } } .-1 } */
  36 }