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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/113099] locale without RTTI uses dynamic_cast before
 gcc 13.2 or has ODR violation since gcc 13.2
Date: Fri, 05 Jan 2024 10:23:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113099

--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:9f3eb93e72703f6ea30aa27d0b6fc6db62cb4a04

commit r14-6942-g9f3eb93e72703f6ea30aa27d0b6fc6db62cb4a04
Author: Jonathan Wakely <jwakely@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=3Dgnu++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.=