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As noted in bug 117162, C23 changed some rules on UCNs to match C++ (this was a late change agreed in the resolution to CD2 comment US-032, implementing changes from N3124), which we need to implement. Allow UCNs below 0xa0 outside identifiers for C, with a pedwarn-if-pedantic before C23 (and a warning with -Wc11-c23-compat) except for the always-allowed cases of UCNs for $ @ `. Also as part of that change, do not allow \u0024 in identifiers as equivalent to $ for C23. Bootstrapped with no regressions for x86_64-pc-linux-gnu. PR c/117162 libcpp/ * include/cpplib.h (struct cpp_options): Add low_ucns. * init.cc (struct lang_flags, lang_defaults): Add low_ucns. (cpp_set_lang): Set low_ucns * charset.cc (_cpp_valid_ucn): For C, allow UCNs below 0xa0 outside identifiers, with a pedwarn if pedantic before C23 or a warning with -Wc11-c23-compat. Do not allow \u0024 in identifiers for C23. gcc/testsuite/ * gcc.dg/cpp/c17-ucn-1.c, gcc.dg/cpp/c17-ucn-2.c, gcc.dg/cpp/c17-ucn-3.c, gcc.dg/cpp/c17-ucn-4.c, gcc.dg/cpp/c23-ucn-2.c, gcc.dg/cpp/c23-ucnid-2.c: New tests. * c-c++-common/cpp/delimited-escape-seq-3.c, c-c++-common/cpp/named-universal-char-escape-3.c, gcc.dg/cpp/c23-ucn-1.c, gcc.dg/cpp/c2y-delimited-escape-seq-3.c: Update expected messages * gcc.dg/cpp/ucs.c: Use -pedantic-errors. Update expected messages.