https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117028
--- Comment #9 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:e020116db056352d9a7495e85d37e66c36f6ea32 commit r15-4403-ge020116db056352d9a7495e85d37e66c36f6ea32 Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Oct 17 07:01:44 2024 +0200 c, libcpp: Partially implement C2Y N3353 paper [PR117028] The following patch partially implements the N3353 paper. In particular, it adds support for the delimited escape sequences (\u{123}, \x{123}, \o{123}) which were added already for C++23, all I had to do is split the delimited escape sequence guarding from named universal character escape sequence guards (\N{LATIN CAPITAL LETTER C WITH CARON}), which C++23 has but C2Y doesn't and emit different diagnostics for C from C++ for the delimited escape sequences. And it adds support for the new style of octal literals, 0o137 or 0O1777. I have so far added that just for C and not C++, because I have no idea whether C++ will want to handle it similarly. What the patch doesn't do is any kind of diagnostics for obsoletion of \137 or 0137, as discussed in the PR, I think it is way too early for that. Perhaps some non-default warning later on. 2024-10-17 Jakub Jelinek <ja...@redhat.com> PR c/117028 libcpp/ * include/cpplib.h (struct cpp_options): Add named_uc_escape_seqs, octal_constants and cpp_warn_c23_c2y_compat members. (enum cpp_warning_reason): Add CPP_W_C23_C2Y_COMPAT enumerator. * init.cc (struct lang_flags): Add named_uc_escape_seqs and octal_constants bit-fields. (lang_defaults): Add initializers for them into the table. (cpp_set_lang): Initialize named_uc_escape_seqs and octal_constants. (cpp_create_reader): Initialize cpp_warn_c23_c2y_compat to -1. * charset.cc (_cpp_valid_ucn): Test CPP_OPTION (pfile, named_uc_escape_seqs) rather than CPP_OPTION (pfile, delimited_escape_seqs) in \N{} related tests. Change wording of C cpp_pedwarning for \u{} and emit -Wc23-c2y-compat warning for it too if needed. Formatting fixes. (convert_hex): Change wording of C cpp_pedwarning for \u{} and emit -Wc23-c2y-compat warning for it too if needed. (convert_oct): Likewise. * expr.cc (cpp_classify_number): Handle C2Y 0o or 0O prefixed octal constants. (cpp_interpret_integer): Likewise. gcc/c-family/ * c.opt (Wc23-c2y-compat): Add CPP and CppReason parameters. * c-opts.cc (set_std_c2y): Use CLK_STDC2Y or CLK_GNUC2Y rather than CLK_STDC23 and CLK_GNUC23. Formatting fix. * c-lex.cc (interpret_integer): Handle C2Y 0o or 0O prefixed and wb/WB/uwb/UWB suffixed octal constants. gcc/testsuite/ * gcc.dg/bitint-112.c: New test. * gcc.dg/c23-digit-separators-1.c: Add _Static_assert for valid binary constant with digit separator. * gcc.dg/c23-octal-constants-1.c: New test. * gcc.dg/c23-octal-constants-2.c: New test. * gcc.dg/c2y-digit-separators-1.c: New test. * gcc.dg/c2y-digit-separators-2.c: New test. * gcc.dg/c2y-octal-constants-1.c: New test. * gcc.dg/c2y-octal-constants-2.c: New test. * gcc.dg/c2y-octal-constants-3.c: New test. * gcc.dg/cpp/c23-delimited-escape-seq-1.c: New test. * gcc.dg/cpp/c23-delimited-escape-seq-2.c: New test. * gcc.dg/cpp/c2y-delimited-escape-seq-1.c: New test. * gcc.dg/cpp/c2y-delimited-escape-seq-2.c: New test. * gcc.dg/cpp/c2y-delimited-escape-seq-3.c: New test. * gcc.dg/cpp/c2y-delimited-escape-seq-4.c: New test. * gcc.dg/octal-constants-1.c: New test. * gcc.dg/octal-constants-2.c: New test. * gcc.dg/octal-constants-3.c: New test. * gcc.dg/octal-constants-4.c: New test. * gcc.dg/system-octal-constants-1.c: New test. * gcc.dg/system-octal-constants-1.h: New file.
