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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/67116] incorrect detection of thread model when
 cross-compiling the tool chain
Date: Mon, 23 Nov 2020 13:16:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67116

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Cezary =C5=9Aliwa from comment #6)
> Created attachment 36131 [details]
> config.log
>=20
> libstdc++v3 config.log

This shows:

CXX=3D' x86_64-w64-mingw32-c++ -L/mingw64/x86_64-w64-mingw32/lib
-L/mingw64/mingw/lib -isystem /mingw64/x86_64-w64-mingw32/include -isystem
/mingw64/mingw/include   '
CXXCPP=3D' x86_64-w64-mingw32-c++ -L/mingw64/x86_64-w64-mingw32/lib
-L/mingw64/mingw/lib -isystem /mingw64/x86_64-w64-mingw32/include -isystem
/mingw64/mingw/include    -E'

That means you're building libstdc++ with the wrong compiler.=