[Bug libstdc++/113099] locale without RTTI uses dynamic_cast before gcc 13.2 or has ODR violation since gcc 13.2

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113099

--- Comment #16 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:9f3eb93e72703f6ea30aa27d0b6fc6db62cb4a04

commit r14-6942-g9f3eb93e72703f6ea30aa27d0b6fc6db62cb4a04
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Jan 3 12:23:32 2024 +0000

    libstdc++: Use if-constexpr in std::__try_use_facet [PR113099]

    As noted in the PR, we can use if-constexpr for the explicit
    instantantiation definitions that are compiled with -std=gnu++11. We
    just need to disable the -Wc++17-extensions diagnostics.

    libstdc++-v3/ChangeLog:

            PR libstdc++/113099
            * include/bits/locale_classes.tcc (__try_use_facet): Use
            if-constexpr for C++11 and up.