[Bug libstdc++/100017] [11/12 regression] error: 'fenv_t' has not been declared in '::' -- cross toolchain fails to build

[unlvsur at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100017

--- Comment #23 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #22)
> *** Bug 101060 has been marked as a duplicate of this bug. ***

I can confirm Yujie Yang's patch works. Just add -nostdinc++ to configure and
configure.ac in gcc root repository (not in gcc subdirectory nor libstdc++-v3
subdirectory)

Yes. So it is very easy to fix.