Oh sweet! #Emacs native-comp branch is going to be merged into master in about a week from now!
@temporal Great news! You know of any overview of this new feature? I build master on Sundays, this could be fun to try early on.
@cadadr It's the same stuff that's been on feature/native-comp branch for the past year or so.
You'll need recent gcc and libgccjit; I use version 10 for both at the moment.
With this feature, Emacs will automatically compile Elisp into bare metal. Can be ahead of time, or can be JIT - i.e. it'll compile Elisp function by function as you use it, and transparently substitute native code for bytecode.
End result: amazing performance boost across the board.
@temporal AOT is great news if it works just as seamlessly as bytecode or pdumper.
Can't wait for the sunday now :) Thanks for the link!
@cadadr Why wait for Sunday when you can build from source now? :). feature/native-comp tracks master with very little lag, and it's been stable for at least almost a year now (i.e. for as long as I've been using it). Everything works as normal, except much faster.
@temporal Oh, the urge is hard to resist, but I've readings to complete.. Something tells me this'll be a bit involved for me, as my GCC is old on Debian (8.x). I feel like upgrading to Testing, but I fear breaking stuff, which I'd rather avoid for a couple months.
@cadadr I see. From what I remember + googled now, I think people had success with versions of gcc and libgccjit as low as 8. Per author's page, 9+ is recommended, 8 should work now, 7 should but was reported it doesn't.
Emacs is build with autotools, so I guess you could install a second version of GCC and just set CC/CXX/whatever env variables before running ./configure to choose a different compiler for just this one build.
I'm not a C/Linux whiz, so I can't advise much here.
@cadadr But if you prefer to patiently wait for the next ~10 days, then you can whet your appetite by reading the page I linked to in my previous toot (reverse-chronological updates on the project + sort of README), and/or the original paper that explains how native-comp - also called GccEmacs - works: https://arxiv.org/pdf/2004.02504.pdf :).
@temporal Thanks for the links! I recall encountering these. It's been a while tho so my exemplary memory is at it, forgetting useful stuff like this and remembering minutiae...
If 8.x is not good enough I think I'll have two options: upgrade to testing which probably has 10.x, or the better option is to activate guix on debian stable and use --with-source (which I wanted to try anyways). Building a GCC tarball is an option, but I generally avoid that as it confuses the system sometimes...
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