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From: "isuruf at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/80196] fenv_t not declared
Date: Sat, 24 Jul 2021 13:35:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D80196

Isuru Fernando <isuruf at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |isuruf at gmail dot com

--- Comment #10 from Isuru Fernando <isuruf at gmail dot com> ---
Failure in gcc 11.1.0 is new and was introduced in
2251b4a5423efa8ee0d7e67537b63e404a1f6afa.

If we are building a canadian cross compiler, then
libstdc++-v3/src/c++17/floating_from_chars.cc will be compiled
with -I<build-dir>/libstdc++-v3/include where fenv.h is.
fenv.h here is the C++ include file which tries to include
the C include file with the same name by using include_next,
but finds the C++ include file from the cross compiler used for
building gcc which becomes empty because of the same include guard
used.=