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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/103891] clang-13 fails to compile libstdc++'s
 std::variant<std::vector<int>>: error: attempt to use a deleted function
Date: Tue, 04 Jan 2022 10:07:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103891

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |MOVED
           See Also|                            |https://github.com/llvm/llv
                   |                            |m-project/issues/45614

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is a known bug (or unfinished feature) in Clang.

https://github.com/llvm/llvm-project/issues/45614

We're not going to work around it in libstdc++ because there is no feature =
test
macro that allows us to detect whether clang supports it, see
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2493r0.html for
details.

If/when GCC bumps the value of __cpp_concepts we can use that to make C++20
support in std::variant conditional on compiler support.=