bug#48804: 27.2; compilation emacs on macOS

[Niels Søndergaard]

Thanks,

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 ….. 

but thanks

mvh

Niels 

Den 4. jun. 2021 kl. 13.52 skrev Konrad Podczeck <konrad.podczeck@univie.ac.at>:

Am 04.06.2021 um 08:00 schrieb Eli Zaretskii <eliz@gnu.org>:

Date: Thu, 3 Jun 2021 22:34:44 +0100
From: Alan Third <alan@idiocy.org>
Cc: nisoni@algon.dk, 48804@debbugs.gnu.org

in addition to libgccjit, you need to install gcc-11, and to insert somethin like the following into your .bash_profile

export CC="/usr/local/Cellar/gcc/11.1.0/bin/gcc-11”

(assuming you use homebrew to install additional unix tools).

FYI GCC is unable to build GUI emacs on macOS (or at least the native
GUI). And there's no requirement to build Emacs with GCC for native
compilation to work, as long as libgccjit was installed with Homebrew,
Emacs configure should be able to find it.

That is true, but AFAIK libgccjit invokes gcc as part of the native
compilation, so GCC does need to be installed, even if Emacs is built
with another compiler.

For this reason, I mailed to the homebrew people, and got this response:

"What compiler are you using? Do you have Homebrew gcc installed?"

After installing gcc-11 from homebrew, and inserting the line

export CC="/usr/local/Cellar/gcc/11.1.0/bin/gcc-11”

in my .bash_profile, the “smoke test" error message (about which this disussion started) was gone and I could build Emacs with the native compile option.

(And maybe we should ping the GCC developers to finish the work on the
features needed to build Emacs -- there's a Bugzilla PR, where, last
time I checked, there was some work being done).