gcc/testsuite/g++.dg/uninit-pred-loop-1_c.cc

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wuninitialized -O2" } */
   3
   4 extern int bar();
   5 int foo(int n, int m)
   6 {
   7  for (;;) {
   8    int err = ({int _err;
   9      for (int i = 0; i < 16; ++i) {
  10        if (m+i > n)
  11           break;
  12        _err = 17;
  13        _err = bar();
  14      }
  15      _err;
  16    });
  17
  18    if (err == 0) return 17; }); /* { dg-warning "uninitialized" "warn on _err" } */
  19  }
  20
  21  return 18;
  22 }
  23