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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105529] [13 Regression] cxx_eval_store_expression on arm
 because of ctor returning this since r13-160-g967cdbe6629653
Date: Mon, 09 May 2022 17:11:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105529

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot=
 gnu.org

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Therefore, a potential fix would be:

--- a/gcc/cp/constexpr.cc
+++ b/gcc/cp/constexpr.cc
@@ -5916,8 +5916,9 @@ cxx_eval_store_expression (const constexpr_ctx *ctx, =
tree
t,

   gcc_checking_assert (!*valp || (same_type_ignoring_top_level_qualifiers_p
                  (TREE_TYPE (*valp), type)));
-  if (empty_base || !(same_type_ignoring_top_level_qualifiers_p
-             (TREE_TYPE (init), type)))
+  if (empty_base || (CLASS_TYPE_P (TREE_TYPE (init))
+            && !(same_type_ignoring_top_level_qualifiers_p
+             (TREE_TYPE (init), type))))
     {
       /* For initialization of an empty base, the original target will be
        *(base*)this, evaluation of which resolves to the object


This code expects code like

  D.2181 =3D {}

where the type of the LHS is the derived type and the type of the RHS is the
base type.=