https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108053
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Tomasz Kaminski <tkami...@gcc.gnu.org>: https://gcc.gnu.org/g:22847ef193670e761ed205a4a6f0a694b939d4e4 commit r15-8023-g22847ef193670e761ed205a4a6f0a694b939d4e4 Author: Tomasz KamiÅski <tkami...@redhat.com> Date: Mon Mar 10 16:51:57 2025 +0100 libstdc++: Hide 128-bit int and float types behind handle for basic_format_arg visitation [PR108053] Implement visit_format_arg and basic_format_arg::visit function, in terms of _M_visit_user member functions, that wraps any type stored inside basic_format_arg, that is not specified in the standard, into the handle. This affects __int128, unsigned __int128, PowerPC specific __ieee128 and __ibm128, and _Float128 for architectures where long double is not 128bits. The bfloat16, _Float16, _Float32, _Float32, and _Float128 for 128bits long double are not are not addressed, as they are transformed into a standard floating point types. For internal purposes __format::__visit_format_arg function is used, that provides an unmodified access to stored object. PR libstdc++/108053 libstdc++-v3/ChangeLog: * include/std/format (basic_format_arg::_M_visit_user): Helper function for wrapping extension types into handle. (visit_format_arg): Call `_M_visit_user` instead of `_M_visit`. (basic_format_arg::visit): As above. (__format::__visit_format_arg): Provides direct access to values stored in basic_format_arg. (__format::__int_from_arg): Use __format::__visit_format_arg instead of std::visit_format_arg. (_Formatting_scanner::_M_format_arg): As above. (_Checking_scanner::__do_vformat_to): As above. * testsuite/std/format/arguments/args.cc: New tests. * testsuite/std/format/string.cc: Test for using __int128 as width/precision. Reviewed-by: Jonathan Wakely <jwak...@redhat.com> Signed-off-by: Tomasz KamiÅski <tkami...@redhat.com>
