1  /* { dg-do compile } */
       2  /* { dg-options "-Wall -Werror -Wno-error=main -Wno-foobar" } */
       3  
       4  void main() {} /* { dg-warning "return type" } */
       5  
       6  /* { dg-message "unrecognized command-line option" "" { target *-*-* } 0 } */