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From: "redi 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: Sun, 24 Dec 2023 14:46:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113099

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to andysem from comment #3)
> I think, a failing dynamic_cast would not be useful as this would make
> std::use_facet unusable with -fno-rtti.

I don't see a problem with that. If you want to use a polymorphic container=
 of
facets, you need RTTI. The standard facets will work, but it doesn't seem
reasonable to expect it to work for program-defined facets. And a
std::use_facet that fails seems better than one that segfaults, doesn't it?=