1  /* { dg-do compile } */ 
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  extern __SIZE_TYPE__ strlen (const char *) __attribute__ ((__pure__));
       4  extern void link_error (void);
       5  
       6  void
       7  foo (const char *str)
       8  {
       9    __SIZE_TYPE__ a = strlen (str);
      10    __SIZE_TYPE__ b = strlen (str);
      11    if (a != b)
      12      link_error ();
      13  }
      14  /* { dg-final { scan-tree-dump-times "link_error" 0 "optimized"} } */