[PATCH] Sema: Fix CheckReturnStackAddr when RetValExp is an explicit cast

Clang Frontend
1

Hi,

I have found that `Sema::CheckReturnStackAddr` failed to generate warnings for `diag::warn_ret_stack_ref` and `diag::warn_ret_local_temp_ref` when the return value expression is an explicit cast.

Provided the following code,

const int &test1()
{
  return 0;
}

const int &test2()
{
  int val = 0;
  return val;
}

const int &test3()
{
  return static_cast<const int &>(0);
}

const int &test4()
{
  int val = 0;
  return static_cast<const int &>(val);
}

Clang (as of r194251) generates warnings for `test1` and `test2`, however, no warnings are given for `test3` and `test4`.

GCC (4.8.1) is able to successfully generate warnings for all of the above.

sema_eval_val.patch (912 Bytes)