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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105377] Likely a misleading clang warning
 -Wc++20-attribute-extensions
Date: Mon, 25 Apr 2022 14:44:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105377

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
But we don['t want to use gnu++17 because we want the compiler to be built
using portable ISO C++17. An unrecognized attribute is a portable ISO C++17
construct, it just doesn't do anything (except maybe give a warning).

We could add:

#ifdef __clang__
#pragma clang diagnostic ignored "-Wc++20-attribute-extensions"
#endif

To disable this warning, since we know we're already guarding the attribute
with __has_cpp_attribute.=