[Bug c++/53224] New: synthesized_method_walk returns uninitialized values

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53224

             Bug #: 53224
           Summary: synthesized_method_walk returns uninitialized values
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


static void
synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p,
                         tree *spec_p, bool *trivial_p, bool *deleted_p,
                         bool *constexpr_p, bool diag)
{
  tree binfo, base_binfo, scope, fnname, rval, argtype;
  bool move_p, copy_arg_p, assign_p, expected_trivial, check_vdtor;
  VEC(tree,gc) *vbases;
  int i, quals, flags;
  tsubst_flags_t complain;
  const char *msg;
  bool ctor_p;

  if (spec_p)
    *spec_p = (cxx_dialect >= cxx0x ? noexcept_true_spec : empty_except_spec);

  if (deleted_p)
    {
      /* "The closure type associated with a lambda-expression has a deleted
         default constructor and a deleted copy assignment operator."
         This is diagnosed in maybe_explain_implicit_delete.  */
      if (LAMBDA_TYPE_P (ctype)
          && (sfk == sfk_constructor
              || sfk == sfk_copy_assignment))
        {  
          *deleted_p = true;
          return;  
        }    

      *deleted_p = false;
    }        

trivial_p and constexpr_p may not be initialized here.