gcc/testsuite/gcc.dg/uninit-1-O0.c

   1 /* Spurious uninitialized variable warnings, case 1.
   2    Taken from cppfiles.c (merge_include_chains) */
   3 /* { dg-do compile } */
   4 /* { dg-options "-Wuninitialized" } */
   5
   6 struct list
   7 {
   8   struct list *next;
   9   int id;
  10 };
  11
  12 extern void free (void *);
  13
  14 void remove_dupes (struct list *el)
  15 {
  16   struct list *p, *q, *r;  /* { dg-bogus "r" "uninitialized variable warning" } */
  17
  18   for (p = el; p; p = p->next)
  19   {
  20     for (q = el; q != p; q = q->next)
  21       if (q->id == p->id)
  22       {
  23         r->next = p->next;
  24         free (p);
  25         p = r;
  26         break;
  27       }
  28     r = p;
  29   }
  30 }