1  
       2  int *global_ptr;
       3  
       4  static void __attribute__((noinline))
       5  called_by_test_1 (void)
       6  {
       7    int i = 42;
       8    global_ptr = &i;  
       9  }
      10  
      11  int test_1 (void)
      12  {
      13    called_by_test_1 ();
      14    return *global_ptr; /* { dg-warning "dereferencing pointer 'global_ptr' to within stale stack frame" } */
      15  }
      16  
      17  static void __attribute__((noinline))
      18  called_by_test_2 (int **out)
      19  {
      20    int i = 42;
      21    *out = &i;  
      22  }
      23  
      24  int test_2 (void)
      25  {
      26    int *ptr;
      27    called_by_test_2 (&ptr);
      28    return *ptr; /* { dg-warning "dereferencing pointer 'ptr' to within stale stack frame" } */
      29  }
      30  
      31  static int __attribute__((noinline))
      32  called_by_test_3 (int **out)
      33  {
      34    int i = 42;
      35    *out = &i;
      36    return i;
      37  }
      38  
      39  int test_3 (void)
      40  {
      41    int *lhs_ptr;
      42    *lhs_ptr = called_by_test_3 (&lhs_ptr); /* { dg-warning "use of uninitialized value 'lhs_ptr'" } */
      43    return *lhs_ptr;
      44  }