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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106889] __builtin_strlen fails for some constexpr
 constructs
Date: Thu, 08 Sep 2022 16:48:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106889

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You can either use char_traits<char>::length (which is actually required to
work in constexpr) or use __builtin_is_constant_evaluated() instead of your
workaround.=