1  #include <stdlib.h>
       2  #include <stdio.h>
       3  
       4  int foo = -1;
       5  
       6  extern void bar ();
       7  
       8  int
       9  main (int argc, char **argv)
      10  {
      11    bar ();
      12    printf ("OK\n");
      13    return 0;
      14  }