https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125829
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
https://gcc.gnu.org/g:b200f4d92f1d75aa36623dad71e5970a4a819acf
commit r17-3020-gb200f4d92f1d75aa36623dad71e5970a4a819acf
Author: Jakub Jelinek <[email protected]>
Date: Thu Aug 6 11:41:21 2026 +0200
libcpp: Implement C++29 P3658R1 - Adjust identifier following new Unicode
recommendations
The following patch attempts to implement the C++29
P3658R1 - Adjust identifier following new Unicode recommendations
paper as a DR (for all C++ versions back to C++98, like P1949R7
has been applied as well).
Now, unfortunately C23/C2Y use xid_identifier as well and I'm not
aware of a similar paper and even if there is one later on for C2Y,
not sure if it would be voted in as a DR against C23.
So, this patch adds a bit to differentiate XID_Start+XID_Continue
or XID_Continue from ID_Compat_Math_Start+ID_Compat_Math_Continue
or ID_Compat_Math_Continue and makes C++ 98-26 accept union of
those (pedantic and non-pedantic), while for C23/C2Y it accepts
the union of those only for non-pedantic and for pedantic it still
rejects those.
I've included a patch against the generated ucnid.h as attachment
because otherwise the patch was too large for mailing list limits.
2026-08-06 Jakub Jelinek <[email protected]>
contrib/
* unicode/README: Add another argument to makeucnid
invocation.
gcc/testsuite/
* g++.dg/cpp23/ucnid-3-utf8.C: New test.
* g++.dg/cpp23/ucnid-4-utf8.C: New test.
* gcc.dg/cpp/ucnid-16-utf8.c: New test.
libcpp/
* makeucnid.cc: Implement C++29 P3658R1 - Adjust identifier
following new Unicode recommendations as a DR. Adjust invocation
in the toplevel comment.
(NONC): Add another enumerator to the unnamed enum, or it into
all_languages, renumber the rest of enumerators.
(read_proplist): New function.
(write_table): Print also NONC bit.
(main): Expect 6 arguments rather than 5. Call read_proplist.
* charset.cc (NONC): Add another enumerator to the unnamed enum.
(cpp_check_xid_property): Return 0 if NONC bit is set.
(ucn_valid_in_identifier): If pedantic xid_identifiers in C,
return 0 if NONC bit is set.
* ucnid.h: Regenerate.
Reviewed-by: Jason Merrill <[email protected]>
