1  /* { dg-do compile } */
       2  /* { dg-options "-O" } */
       3  /* { dg-require-effective-target alloca } */
       4  
       5  void foo(void)
       6  {
       7   __builtin_calloc (1, 1); /* { dg-warning "ignoring return value of '__builtin_calloc' declared with attribute 'warn_unused_result'" } */
       8  }