https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120778
--- Comment #6 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:b9f443b6177881c490fbce9ba65b86a7cd65f11f commit r16-2747-gb9f443b6177881c490fbce9ba65b86a7cd65f11f Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Aug 4 14:27:14 2025 +0200 libcpp: Use pedwarn instead of warning for CWG2578 diagnostics [PR120778] This is another case which changed from compile time undefined behavior to ill-formed, diagnostic required. Now, we warn on this, so pedantically that is good enough, maybe all we need is a testcase, but the following patch changes it to a pedwarn for C++26. 2025-08-04 Jakub Jelinek <ja...@redhat.com> PR preprocessor/120778 * macro.cc (stringify_arg): For C++26 emit a pedarn instead of warning for \ at the end of stringification. * g++.dg/DRs/dr2578.C: New test.
