1  /* PR middle-end/93646 - confusing -Wstringop-truncation on strncat where
       2     -Wstringop-overflow is expected
       3     { dg-do compile }
       4     { dg-options "-O2 -Wall" } */
       5  
       6  extern __SIZE_TYPE__ strlen (const char*);
       7  extern char* strncat (char*, const char*, __SIZE_TYPE__);
       8  
       9  
      10  char a[4];
      11  
      12  
      13  void f0 (char *d, const char *s)
      14  {
      15    strncat (d, s, strlen (s));   // { dg-warning "specified bound depends on the length of the source argument" }
      16    /* { dg-message "function 'f0'.*inlined from 'f1'" "inlining stack" { target *-*-* } 0 }  */
      17  
      18    // Prevent f0 from being replaced by g0.
      19    *d = 'f';
      20  }
      21  
      22  void f1 (const char *s)
      23  {
      24    f0 (a, s);
      25  }
      26  
      27  
      28  static void g0 (char *d, const char *s)
      29  {
      30    strncat (d, s, strlen (s));   // { dg-warning "specified bound 3 equals source length" }
      31    /* { dg-message "function 'g0'.*inlined from 'g1'" "inlining stack" { target *-*-* } 0 }  */
      32  
      33    // Prevent g0 from being replaced by f0.
      34    *d = 'g';
      35  }
      36  
      37  void g1 (void)
      38  {
      39    g0 (a, "123");
      40  }