1  /* { dg-do run { target *-*-linux* *-*-gnu* *-*-solaris* *-*-uclinux* } } */
       2  /* { dg-options -O2 } */
       3  
       4  #include <sys/types.h>
       5  #include <sys/mman.h>
       6  #include <unistd.h>
       7  #include <stdlib.h>
       8  
       9  struct S { long x __attribute__((packed)); }; /* { dg-warning "attribute ignored" "" { target default_packed } } */
      10  volatile long sink;
      11  
      12  void foo (struct S *s)
      13  {
      14    sink = s->x;
      15  }
      16  
      17  int main ()
      18  {
      19    size_t ps = getpagesize ();
      20    char *ptr, *page;
      21    struct S *s;
      22  
      23    ptr = malloc (3*ps);
      24    page = (char *)(((__UINTPTR_TYPE__)ptr + (ps - 1)) & -ps);
      25    munmap (page + ps, ps);
      26  
      27    s = (struct S *)(page + ps - sizeof(struct S));
      28    foo(s);
      29  
      30    return 0;
      31  }