https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113582
--- Comment #7 from GCC 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:d9318caed3bbff8136d13e00dcfc020a59d10f78 commit r15-329-gd9318caed3bbff8136d13e00dcfc020a59d10f78 Author: Marek Polacek <pola...@redhat.com> Date: Wed Jan 24 18:06:48 2024 -0500 c++: #pragma doesn't disable -Wunused-label [PR113582] The PR complains that void do_something(){ #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-label" start:; #pragma GCC diagnostic pop } #1 doesn't work. That's because we warn_for_unused_label only while we're in finish_function, meaning we're at #1 where we're outside the #pragma region. We can use suppress_warning + warning_suppressed_p to fix this. Note that I'm not using TREE_USED. Propagating it in tsubst_stmt/LABEL_EXPR from decl to label would mean that we don't warn in do_something2, but I think we want the warning there: we're in a template and the goto is a discarded statement. PR c++/113582 gcc/c-family/ChangeLog: * c-warn.cc (warn_for_unused_label): Don't warn if -Wunused-label has been suppressed for the label. gcc/cp/ChangeLog: * parser.cc (cp_parser_label_for_labeled_statement): suppress_warning if it's not enabled at input_location. * pt.cc (tsubst_stmt): Call copy_warning. gcc/testsuite/ChangeLog: * g++.dg/warn/Wunused-label-4.C: New test.
