bug#43269: 28.0.50; [feature/native-comp] provide a user feedback on Emacs being native compiled

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: rms@gnu.org,  arthur.miller@live.com,  43269@debbugs.gnu.org
> Date: Wed, 09 Sep 2020 16:32:58 +0000
> 
> > Is this with "make" or with "make -jN"? if the latter, what value of N
> > was used?
> 
> $ git clean -xfd && ./autogen.sh && ./configure --without-x --with-nativecomp 
>  && time make NATIVE_FAST_BOOT=1 -j16
> [...]
> real    4m19.570s
> user    28m59.958s
> sys     0m48.797s
> $
> 
> I guess -j1 may even score slightly less user time.

So what do you have there, an i9 CPU?  In any case, 4 min with -j16 is
quite a lot.

And what does NATIVE_FAST_BOOT=1 do? what kind of compiler
optimizations does it imply?