https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90236
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Clearly it's this hunk: @@ -6985,27 +7071,10 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain) itself value-dependent, since what we want here is its address. */; else { - if (!DECL_P (expr)) - { - if (complain & tf_error) - error ("%qE is not a valid template argument for type %qT " - "because it is not an object with linkage", - expr, type); - return NULL_TREE; - } - - /* DR 1155 allows internal linkage in C++11 and up. */ - linkage_kind linkage = decl_linkage (expr); - if (linkage < (cxx_dialect >= cxx11 ? lk_internal : lk_external)) - { - if (complain & tf_error) - error ("%qE is not a valid template argument for type %qT " - "because object %qD does not have linkage", - expr, type, expr); - return NULL_TREE; - } - expr = build_address (expr); + + if (invalid_tparm_referent_p (type, expr, complain)) + return NULL_TREE; } if (!same_type_p (type, TREE_TYPE (expr)))