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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 <jakub@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.
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