bug#48804: 27.2; compilation emacs on macOS

[Konrad Podczeck <konrad.podczeck@univie.ac.at>]

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> 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).


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