https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105497
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:60fdce11dc9e5ddf671b07a3fc6ed70476860b22 commit r13-622-g60fdce11dc9e5ddf671b07a3fc6ed70476860b22 Author: Marek Polacek <pola...@redhat.com> Date: Sat May 7 16:15:49 2022 -0400 c, c++: -Wswitch warning on [[maybe_unused]] enumerator [PR105497] This PR complains that we emit the "enumeration value not handled in switch" warning even though the enumerator was marked with the [[maybe_unused]] attribute. I couldn't just check TREE_USED, because the enumerator could have been used earlier in the function, which doesn't play well with the c_do_switch_warnings warning. Instead, I had to check the attributes on the CONST_DECL. This is easy since the TYPE_VALUES of an enum type are now consistent between C and C++, both of which store the CONST_DECL in its TREE_VALUE. PR c++/105497 gcc/c-family/ChangeLog: * c-warn.cc (c_do_switch_warnings): Don't warn about unhandled enumerator when it was marked with attribute unused. gcc/testsuite/ChangeLog: * c-c++-common/Wswitch-1.c: New test. * g++.dg/warn/Wswitch-4.C: New test.
