https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46457
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:1914ca8791ce4e0ba821e818cb6f86c76afdb6f2 commit r15-3500-g1914ca8791ce4e0ba821e818cb6f86c76afdb6f2 Author: Jason Merrill <ja...@redhat.com> Date: Thu Aug 29 11:09:21 2024 -0400 c-family: add attribute flag_enum [PR81665] Several PRs complain about -Wswitch warning about a case for a bitwise combination of enumerators. Clang has an attribute flag_enum to prevent this; let's adopt that approach as well. This also recognizes the attribute as [[clang::flag_enum]], introducing handling of the clang attribute namespace. PR c++/46457 PR c++/81665 gcc/c-family/ChangeLog: * c-attribs.cc (handle_flag_enum_attribute): New. (c_common_gnu_attributes): Add it. (c_common_clang_attributes, c_common_clang_attribute_table): New. * c-common.h: Declare c_common_clang_attribute_table. * c-warn.cc (c_do_switch_warnings): Handle flag_enum. gcc/c/ChangeLog: * c-objc-common.h (c_objc_attribute_table): Add c_common_clang_attribute_table. gcc/cp/ChangeLog: * cp-objcp-common.h (cp_objcp_attribute_table): Add c_common_clang_attribute_table. gcc/testsuite/ChangeLog: * c-c++-common/attr-flag-enum-1.c: New test. gcc/ChangeLog: * doc/extend.texi: Document flag_enum attribute. * doc/invoke.texi: Mention flag_enum in -Wswitch. libstdc++-v3/ChangeLog: * include/bits/regex_constants.h: Use flag_enum.
