1  #include <stdio.h>
       2  
       3  extern int foo1;
       4  extern int foo2;
       5  extern void bar (void);
       6  
       7  void
       8  xxx1 (void)
       9  {
      10    printf ("MAIN1\n");
      11  }
      12  
      13  void
      14  xxx2 (void)
      15  {
      16    printf ("MAIN2\n");
      17  }
      18  
      19  int
      20  main (void)
      21  {
      22    foo1 = 1;
      23    foo2 = 1;
      24    bar ();
      25    if (foo1 == -1)
      26      printf ("OK1\n");
      27    else if (foo1 == 1)
      28      printf ("OK2\n");
      29    if (foo2 == -1)
      30      printf ("OK3\n");
      31    else if (foo2 == 1)
      32      printf ("OK4\n");
      33    return 0;
      34  }