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The following patch implements the C++23 P2290R3 paper. 2022-08-20 Jakub Jelinek <jakub@redhat.com> PR c++/106645 libcpp/ * include/cpplib.h (struct cpp_options): Implement P2290R3 - Delimited escape sequences. Add delimite_escape_seqs member. * init.cc (struct lang_flags): Likewise. (lang_defaults): Add delim column. (cpp_set_lang): Copy over delimite_escape_seqs. * charset.cc (extend_char_range): New function. (_cpp_valid_ucn): Use it. Handle delimited escape sequences. (convert_hex): Likewise. (convert_oct): Likewise. (convert_ucn): Use extend_char_range. (convert_escape): Call convert_oct even for \o. (_cpp_interpret_identifier): Handle delimited escape sequences. * lex.cc (get_bidi_ucn_1): Likewise. Add end argument, fill it in. (get_bidi_ucn): Adjust get_bidi_ucn_1 caller. Use end argument to compute num_bytes. gcc/testsuite/ * c-c++-common/cpp/delimited-escape-seq-1.c: New test. * c-c++-common/cpp/delimited-escape-seq-2.c: New test. * c-c++-common/cpp/delimited-escape-seq-3.c: New test. * c-c++-common/Wbidi-chars-24.c: New test. * gcc.dg/cpp/delimited-escape-seq-1.c: New test. * gcc.dg/cpp/delimited-escape-seq-2.c: New test. * g++.dg/cpp/delimited-escape-seq-1.C: New test. * g++.dg/cpp/delimited-escape-seq-2.C: New test.