gcc/testsuite/c-c++-common/pr51628-6.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;
   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 *-*-* } .-1 } */
  17
  18 int *
  19 foo (void)
  20 {
  21   struct pair_t arr[2] = { { 1, 10 }, { 2, 20 } };
  22   int *p0, *p1;
  23   p0 = &arr[0].i;
  24 /* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
  25   bar (p0);
  26   p1 = &arr[1].i;
  27 /* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
  28   bar (p1);
  29   bar (&p.i);
  30 /* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
  31   x = &p.i;
  32 /* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
  33   return &p.i;
  34 /* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
  35 }