https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102921
--- 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 = maybe_constant_init (expr);
+ init = maybe_constant_init (expr, NULL_TREE,
+ VAR_P (decl)
+ && DECL_DECLARED_CONSTEXPR_P (decl));
/* As in store_init_value. */
init = cp_fully_fold (init);
if (TREE_CONSTANT (init))
makes this accepted, but not the PR101588 testcase.
