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The following patch implements CWG3053 approved in Kona, where it is now valid not just to #define likely(a) or #define unlikely(a, b, c) but also to #undef likely or #undef unlikely. 2025-11-10 Jakub Jelinek <jakub@redhat.com> libcpp/ * directives.cc: Implement CWG3053. (do_undef): Don't pedwarn or warn about #undef likely or #undef unlikely. gcc/testsuite/ * g++.dg/warn/Wkeyword-macro-4.C: Don't diagnose for #undef likely or #undef unlikely. * g++.dg/warn/Wkeyword-macro-5.C: Likewise. * g++.dg/warn/Wkeyword-macro-9.C: Likewise. * g++.dg/warn/Wkeyword-macro-8.C: Likewise. * g++.dg/warn/Wkeyword-macro-10.C: Likewise.