gcc/testsuite/gcc.dg/uninit-pred-3_b.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wuninitialized -O2" } */
   3
   4 int g;
   5 void bar();
   6 void blah(int);
   7
   8 int foo (int n, int m, int r)
   9 {
  10   int flag = 0;
  11   int v;
  12
  13   if (n)
  14     {
  15       v = r;
  16       flag = 1;
  17     }
  18
  19   if (m)
  20     g++;
  21   else
  22     bar();
  23
  24   if (r > 0)
  25      goto use;
  26   if (flag)
  27     {
  28 use:
  29       blah(v); /* { dg-warning "uninitialized" "real warning" } */
  30     }
  31
  32   return 0;
  33 }