1  int foo (void);
       2  int baz (void);
       3  extern int weak (void);
       4  asm (".weak weak");
       5  
       6  int foo (void)
       7  {
       8    return 20;
       9  }
      10  
      11  int baz (void)
      12  {
      13    return weak () + 1;
      14  }