1  /* { dg-do compile } */
       2  /* { dg-options "-O2" } */
       3  
       4  typedef __SIZE_TYPE__ size_t;
       5  
       6  extern void warn_memset_zero_len (void)
       7  __attribute__((__warning__ ("memset used with constant zero length parameter;"
       8  			    " this could be due to transposed parameters")));
       9  
      10  extern inline __attribute__((gnu_inline, always_inline, artificial)) void *
      11  memset (void *dest, int ch, size_t len)
      12  {
      13    if (__builtin_constant_p (len) && len == 0)
      14      {
      15        warn_memset_zero_len ();	/* { dg-warning "memset used with constant zero" } */
      16        return dest;
      17      }
      18    return __builtin_memset (dest, ch, len);
      19  }
      20  
      21  char buf[10];
      22  
      23  int
      24  main (void)
      25  {
      26    memset (buf, sizeof (buf), 0);
      27    return 0;
      28  }