[Bug libstdc++/109814] [13/14 Regression] freestanding using cmath does not compile anymore

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109814

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks for the extra info.

I don't think it's really _forbidden_, but not a use case I was really aware
of, and didn't realise it's something we might need to support.