[Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85553

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |8.0

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So shouldn't we then do instead:
--- gcc/cp/init.c.jj    2018-04-27 19:11:56.613549524 +0200
+++ gcc/cp/init.c       2018-04-27 19:20:50.102839130 +0200
@@ -180,8 +180,10 @@ build_zero_init_1 (tree type, tree nelts
        items with static storage duration that are not otherwise
        initialized are initialized to zero.  */
     ;
-  else if (TYPE_PTR_OR_PTRMEM_P (type) || NULLPTR_TYPE_P (type))
+  else if (TYPE_PTR_OR_PTRMEM_P (type))
     init = fold (convert (type, nullptr_node));
+  else if (NULLPTR_TYPE_P (type))
+    init = build_int_cst (type, 0);
   else if (SCALAR_TYPE_P (type))
     init = fold (convert (type, integer_zero_node));
   else if (RECORD_OR_UNION_CODE_P (TREE_CODE (type)))

Then we don't warn on cpp0x/Wzero-as-null-pointer-constant-3.C and accept the
value initialization in constexpr.