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

[redi at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't think the patch is sufficient, I think I had a complete one.