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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102921] error: modification of '<temporary>' is not a
 constant expression
Date: Mon, 25 Oct 2021 08:27:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102921

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/call.c.jj    2021-10-21 16:06:42.231940456 +0200
+++ gcc/cp/call.c       2021-10-25 10:20:00.970635564 +0200
@@ -12735,7 +12735,9 @@ set_up_extended_ref_temp (tree decl, tre

   /* If the initializer is constant, put it in DECL_INITIAL so we get
      static initialization and use in constant expressions.  */
-  init =3D maybe_constant_init (expr);
+  init =3D maybe_constant_init (expr, NULL_TREE,
+                             VAR_P (decl)
+                             && DECL_DECLARED_CONSTEXPR_P (decl));
   /* As in store_init_value.  */
   init =3D cp_fully_fold (init);
   if (TREE_CONSTANT (init))
makes this accepted, but not the PR101588 testcase.=