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      1 #include <stdio.h>
      2 
      3 int x;
      4 int y;
      5 
      6 __attribute__((weak))
      7 void foobar (void) { y++; x++; }
      8 
      9 int main (void)
     10 {
     11   foobar ();
     12   if (y == 0)
     13     {
     14       if (x == -1)
     15 	printf ("OK\n");
     16     }
     17   else
     18     {
     19       if (x == 1)
     20 	printf ("OK\n");
     21     }
     22   return 0;
     23 }
     24