1  extern char *_end __attribute__ ((visibility("hidden")));
       2  extern char *_edata __attribute__ ((visibility("hidden")));
       3  extern char *__bss_start __attribute__ ((visibility("hidden")));
       4  
       5  int
       6  foo (void)
       7  {
       8    return _end[0] + _edata[0] + __bss_start[0];
       9  }