https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82134
--- Comment #8 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:32ff6f4728e4021ff33fb1da6eb3bafe3ea5a15e commit r16-2280-g32ff6f4728e4021ff33fb1da6eb3bafe3ea5a15e Author: Jeremy Rifkin <jer...@rifkin.dev> Date: Tue Jul 15 18:17:01 2025 -0400 c, c++: Fix unused result for empty types [PR82134] Hi, This fixes PR c/82134 which concerns gcc emitting an incorrect unused result diagnostic for empty types. This diagnostic is emitted from tree-cfg.cc because of a couple code paths which attempt to avoid copying empty types, resulting in GIMPLE that isn't using the returned value of a call. To fix this I've added suppress_warning in three locations and a corresponding check in do_warn_unused_result. Cheers, Jeremy PR c/82134 gcc/cp/ChangeLog: * call.cc (build_call_a): Add suppress_warning * cp-gimplify.cc (cp_gimplify_expr): Add suppress_warning gcc/ChangeLog: * gimplify.cc (gimplify_modify_expr): Add suppress_warning * tree-cfg.cc (do_warn_unused_result): Check warning_suppressed_p gcc/testsuite/ChangeLog: * c-c++-common/attr-warn-unused-result-2.c: New test. Signed-off-by: Jeremy Rifkin <jer...@rifkin.dev>
