1  #include <stdio.h>
       2  
       3  int foo;
       4  
       5  extern void xxx (void);
       6  
       7  void
       8  bar (int x)
       9  {
      10    if (foo == 1)
      11      printf ("OK1\n");
      12    else if (foo == 0)
      13      printf ("OK2\n");
      14    foo = -1;
      15    xxx ();
      16  }