https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114459
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:17458d2bc74b904968e6bdc12527eb040c8d2370 commit r15-304-g17458d2bc74b904968e6bdc12527eb040c8d2370 Author: Jakub Jelinek <ja...@redhat.com> Date: Tue May 7 22:38:01 2024 +0200 c++: Implement C++26 P2893R3 - Variadic friends [PR114459] The following patch imeplements the C++26 P2893R3 - Variadic friends paper. The paper allows for the friend type declarations to specify more than one friend type specifier and allows to specify ... at the end of each. The patch doesn't introduce tentative parsing of friend-type-declaration non-terminal, but rather just extends existing parsing where it is a friend declaration which ends with ; after the declaration specifiers to the cases where it ends with ...; or , or ..., In that case it pedwarns for cxx_dialect < cxx26, handles the ... and if there is , continues in a loop to parse the further friend type specifiers. 2024-05-07 Jakub Jelinek <ja...@redhat.com> PR c++/114459 gcc/c-family/ * c-cppbuiltin.cc (c_cpp_builtins): Predefine __cpp_variadic_friend=202403L for C++26. gcc/cp/ * parser.cc (cp_parser_member_declaration): Implement C++26 P2893R3 - Variadic friends. Parse friend type declarations with ... or with more than one friend type specifier. * friend.cc (make_friend_class): Allow TYPE_PACK_EXPANSION. * pt.cc (instantiate_class_template): Handle PACK_EXPANSION_P in friend classes. gcc/testsuite/ * g++.dg/cpp26/feat-cxx26.C (__cpp_variadic_friend): Add test. * g++.dg/cpp26/variadic-friend1.C: New test.
