[Bug c++/65509] [5 Regression] [C++11] GCC rejects operator== with two distinct pointers as not constexpr

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65509

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #8)
> The following (untested) should work:
> 
> --- a/gcc/cp/decl.c
> +++ b/gcc/cp/decl.c
> @@ -6113,6 +6113,7 @@ make_rtl_for_nonlocal_decl (tree decl, tree init,
> const char* asmspec)
>       not emitted into the object file unnecessarily.  */
>    filename = LOCATION_FILE (input_location);
>    if (!DECL_VIRTUAL_P (decl)
> +      && !DECL_DECLARED_CONSTEXPR_P (decl)
>        && TREE_READONLY (decl)
>        && DECL_INITIAL (decl) != NULL_TREE
>        && DECL_INITIAL (decl) != error_mark_node
> 
> My reasoning is that we shouldn't defer assembling the variable if it might
> be needed in the constexpr context.

But in the #c5 testcase it isn't DECL_DECLARED_CONSTEXPR_P, is it?