SingleSource/UnitTests/2007-04-25-weak.c

#if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
extern int test_weak () __attribute__ ((weak_import));
#else
extern int test_weak () __attribute__ ((weak));
#endif

int main(){
  int (*t)() = test_weak;
  if (t)
    return t();
  else return 250;
}