1  /* PR tree-optimization/79691 - -Wformat-truncation suppressed by
       2     (and only by) -Og
       3  
       4     { dg-do compile }
       5     { dg-options "-Og -Wall -fdump-tree-optimized" } */
       6  
       7  char d[2];
       8  
       9  /* Verify -Wformat-overflow works.  */
      10  void f1 (void)
      11  {
      12    __builtin_sprintf (d, "%i", 123);   /* { dg-warning "directive writing 3 bytes" } */
      13  }
      14  
      15  /* Verify -Wformat-truncation works.  */
      16  void f2 (void)
      17  {
      18    __builtin_snprintf (d, sizeof d, "%i", 1234);   /* { dg-warning "output truncated writing 4 bytes" } */
      19  }
      20  
      21  /* Verify -fprintf-return-value works.  */
      22  int f3 (void)
      23  {
      24    return __builtin_snprintf (0, 0, "%i", 12345);
      25  }
      26  
      27  /* Verify -fprintf-return-value results used for constant propagation.  */
      28  int f4 (int i)
      29  {
      30    int n1 = __builtin_snprintf (0, 0, "%i", 1234);
      31    int n2 = __builtin_snprintf (0, 0, "%i", 12345);
      32    return n1 + n2;
      33  }
      34  
      35  /* { dg-final { scan-tree-dump-times "sprintf" 1 "optimized" } }
      36     { dg-final { scan-tree-dump-times "snprintf" 1 "optimized" } }
      37     { dg-final { scan-tree-dump " = 9;" "optimized" } } */