https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115897
--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:523836716137d0f7f4088c85752a980f5f971b36 commit r15-2331-g523836716137d0f7f4088c85752a980f5f971b36 Author: Patrick Palka <ppa...@redhat.com> Date: Thu Jul 25 19:05:19 2024 -0400 c++: non-template alias with dependent attributes [PR115897] This patch generalizes our support for dependent attributes on alias templates to also support them on non-template aliases. The main addition is a new predicate dependent_opaque_alias_p controlling whether we can treat an alias (template or non-template) as type-equivalent to its expansion. PR c++/115897 gcc/cp/ChangeLog: * cp-tree.h (dependent_opaque_alias_p): Declare. * pt.cc (push_template_decl): Manually mark a dependent opaque alias or dependent alias template specialization as dependent, and use structural equality for them. (dependent_opaque_alias_p): Define. (alias_template_specialization_p): Don't look through an opaque alias. (complex_alias_template_p): Use dependent_opaque_alias_p instead of any_dependent_template_arguments_p directly. (dependent_alias_template_spec_p): Don't look through an opaque alias. (get_underlying_template): Use dependent_opaque_alias_p instead of any_dependent_template_arguments_p. (instantiate_alias_template): Mention same logic in push_template_decl. (dependent_type_p_r): Remove dependent_alias_template_spec_p check. (any_template_arguments_need_structural_equality_p): Return true for a dependent opaque alias. (alias_ctad_tweaks): Use template_args_equal instead of same_type_p followed by dependent_alias_template_spec_p. * tree.cc (strip_typedefs): Don't strip an opaque alias. * typeck.cc (structural_comptypes): Compare declaration attributes for an opaque alias. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/alias-decl-79.C: Remove xfails. * g++.dg/cpp0x/alias-decl-79a.C: New test. Reviewed-by: Jason Merrill <ja...@redhat.com>
