From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Native compilation: the bird-eye view Date: Sat, 16 May 2020 19:26:46 +0300 Message-ID: <83ftbzdewp.fsf@gnu.org> References: <83o8qocd32.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="33334"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Andrea Corallo Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat May 16 18:27:43 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jZzf5-0008ab-C2 for ged-emacs-devel@m.gmane-mx.org; Sat, 16 May 2020 18:27:43 +0200 Original-Received: from localhost ([::1]:60646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jZzf4-0004Xd-Cl for ged-emacs-devel@m.gmane-mx.org; Sat, 16 May 2020 12:27:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42824) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jZzeQ-0003zH-Oe for emacs-devel@gnu.org; Sat, 16 May 2020 12:27:03 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:44235) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jZzeP-00044C-G2; Sat, 16 May 2020 12:27:01 -0400 Original-Received: from [176.228.60.248] (port=1633 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jZzeM-0003bN-29; Sat, 16 May 2020 12:26:59 -0400 In-Reply-To: (message from Andrea Corallo on Sat, 16 May 2020 12:58:11 +0000) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:250504 Archived-At: > From: Andrea Corallo > Date: Sat, 16 May 2020 12:58:11 +0000 > Cc: emacs-devel@gnu.org > > > If so, they will have > > to be generated on the end-user machines, or perhaps by whoever > > prepares the Emacs binary distributions -- assuming that the binary > > distributions are sufficiently compatible to allow that, > > notwithstanding the differences between the system where the *.eln > > files were generated and the system where they will be installed and > > used. (I don't know what is the granularity of the binary distros wrt > > machine architecture and OS versions -- will that allow to be sure the > > *.eln files are compatible with the target system?) > > Given .eln are just shareds with (almost) no dependecies [1] their > degree of compatibility should be higher then the Emacs binary itself. Well, the "almost" part means we aren't actually sure about this. E.g., what about the dependencies related to the GCC version used to build libgccjit and compile the .eln files? > > The next question is whether we want the *.eln files to exist up front > > for all the Lisp files on the end-user system, or we want them to be > > generated in JIT-like manner, whenever the corresponding Lisp library > > is loaded on demand? The answer to this question might then influence > > the place where the *.eln files are kept -- the JIT alternative would > > suggest to have some kind of cache directory where we put the compiled > > files, similar to what Guile does. > > I suspect that for the average user the best is to have the distribution > do all the compilation upfront for him and have deferred compilation > handling only additional libraries and packages. And for the "non-average" user, who builds Emacs from sources? AFAIU, native compilation of all Lisp files takes many hours even on fast machines -- won't this be an annoyance if we don't come up with a JIT mechanism?