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From: "arthur.j.odwyer at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/70816] bogus error __builtin_strcmp is not a constant
 expression in a constexpr function
Date: Sun, 14 Mar 2021 21:15:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D70816

Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |arthur.j.odwyer at gmail d=
ot com

--- Comment #2 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
Confirmed, I'm also seeing this in C++20 mode. This affects libc++'s
 `char_traits<char>::length(const char *)`.

Example test case: https://godbolt.org/z/MTq1ex=