1  /* { dg-additional-options "-O" } */
       2  
       3  struct ss_s {
       4      union out_or_counting_u {
       5      	char *newstr;
       6      	unsigned long long cnt;
       7      } uu;
       8      _Bool counting;
       9  };
      10  
      11  struct ss_s ss_init(void) {
      12     struct ss_s rr = { .counting = 1 };
      13     return rr;
      14  }
      15  
      16  void ss_out(struct ss_s *t, char cc) {
      17     if (!t->counting) {
      18         *t->uu.newstr++ = cc;
      19     }
      20  }
      21  
      22  int main() {
      23      struct ss_s ss = ss_init();
      24      ss_out(&ss, 'a');
      25  }
      26