https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81967
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:82309222300acf68e345b32155df21e1b876144e commit r15-3746-g82309222300acf68e345b32155df21e1b876144e Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Sep 20 17:35:48 2024 +0100 libstdc++: Document missing features for old std:string ABI [PR116777] There are several features that are not supported when using the old std::string ABI. It's possible that PR 81967 will get fixed, but the missing C++20 features almost certainly won't be. Document this in the manual. libstdc++-v3/ChangeLog: PR libstdc++/116777 * doc/xml/manual/using.xml: Document features that are not supported for the gcc4-compatible ABI. * doc/html/manual/using_dual_abi.html: Regenerate.