bug#48804: 27.2; compilation emacs on macOS

[Eli Zaretskii]

> Date: Fri, 04 Jun 2021 13:26:38 +0100
> CC: konrad.podczeck@univie.ac.at,nisoni@algon.dk,48804@debbugs.gnu.org
> From: Alan Third <alan@idiocy.org>
> 
> >> I’ve gcc 10.2.0_4 installed by Homebrew on my new iMac 24” (with M1),
> >and can’t get a newer version, so I’ll
> >> properly have to wait ….. 
> >
> >What's wrong with GCC 10?  AFAIK, even GCC 7 comes with libgccjit that
> >is good enough for Emacs.
> 
> I believe that libgccjit only just added support for M1 processors in the 
> last week or two, and for whatever reason the Intel emulation on the Macs 
> doesn't work with the older libgccjit either.

Should we mention this in NEWS, where we announce native-compilation
support?  Knowing the prerequisites is important to avoid false
expectations and frustration.