[Bug libstdc++/70722] include_next in cmath skips user-defined wrapper

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70722

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Nadav Har'El from comment #8)
> This issue was closed as supposedly it only affects Firefox's build. It
> definitely does not - it affects any project which attempts to replace the C
> header files (or just one or few of them) but leave the C++ header files
> untouched.

But all of those projects are broken the same way as Firefox was broken.
You can't expect replacing standard C library headers and something not
breaking.