kit

kit
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a.c (266B)

      1 /* STB_WEAK + SHN_UNDEF: weak extern function declared but never defined.
      2  * Its address resolves to NULL; test guards before calling. */
      3 extern __attribute__((weak)) int weak_fn(void);
      4 int test_main(void) {
      5   if ((void*)weak_fn != (void*)0) return 1;
      6   return 0;
      7 }