On Thu, 4 Apr 2024 at 18:33, Jₑₙₛ Gustedt via Liaison
<liaison_at_[hidden]> wrote:
> > > - make the feature testable
> >
> > This seems unnecessary because it comes with C23.
>
> Its a good thing for
>
> - the transition phase
>
> - C library headers trying to cope with different compilers where some
> may provide this (completely, as a predefined macro) and others need
> some help

Is it common for C to have the feature-testing-macro be the facility
itself, as opposed to having a separate
feature-testing macro?