gcc/testsuite/gcc.dg/uninit-pred-5_b.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wuninitialized -O2" } */
   3
   4 int g;
   5 int bar();
   6 int blah(int);
   7 void t(int);
   8
   9 __attribute__((always_inline))
  10 int foo (int n, int* v, int r)
  11 {
  12   int flag = 0;
  13   if (r > n)
  14     {
  15       *v = bar();
  16       flag = 1;
  17     }
  18
  19   if (n > g)
  20     g++;
  21   else
  22     bar();
  23
  24   return flag;
  25 }
  26
  27 int a[100];
  28 int b[100];
  29 int blah(int n)
  30 {
  31   int i;
  32    for (i = 0 ; i < n; i++)
  33      {
  34        int v;
  35        if (foo (n, &v, b[i]))
  36          return 0;
  37        t (v); /* { dg-warning "uninitialized" "real warning" } */
  38      }
  39    return 1;
  40 }
  41