From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andrea Corallo Newsgroups: gmane.emacs.devel Subject: Re: Suppressing native compilation (short and long term) Date: Sat, 15 Oct 2022 15:02:43 +0000 Message-ID: References: <87ill8paw7.fsf@trouble.defaultvalue.org> <83o7uzivey.fsf@gnu.org> <3ac9d2b9632f75018327a1bcde0c373f152c404a.camel@gmail.com> <835ygob7ja.fsf@gnu.org> <8335bra2rl.fsf@gnu.org> <87ilkncugg.fsf@gnus.org> <87edvbcszx.fsf@gnus.org> <875ygl783f.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40837"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: Eli Zaretskii , Stefan Monnier , liliana.prikler@gmail.com, rlb@defaultvalue.org, emacs-devel@gnu.org, alex.coplan@arm.com To: Lars Ingebrigtsen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Oct 15 17:04:05 2022 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 1ojiho-000ALy-Q4 for ged-emacs-devel@m.gmane-mx.org; Sat, 15 Oct 2022 17:04:04 +0200 Original-Received: from localhost ([::1]:34104 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ojihn-0003k5-C1 for ged-emacs-devel@m.gmane-mx.org; Sat, 15 Oct 2022 11:04:03 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39936) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ojigb-0002UJ-Ov for emacs-devel@gnu.org; Sat, 15 Oct 2022 11:02:49 -0400 Original-Received: from mx.sdf.org ([205.166.94.24]:61061) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ojigZ-0001C9-Ve for emacs-devel@gnu.org; Sat, 15 Oct 2022 11:02:49 -0400 Original-Received: from ma.sdf.org (ma.sdf.org [205.166.94.33]) by mx.sdf.org (8.15.2/8.14.5) with ESMTPS id 29FF2hnc021662 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits) verified NO); Sat, 15 Oct 2022 15:02:44 GMT In-Reply-To: <875ygl783f.fsf@gnus.org> (Lars Ingebrigtsen's message of "Sat, 15 Oct 2022 11:24:20 +0200") Received-SPF: pass client-ip=205.166.94.24; envelope-from=akrl@sdf.org; helo=mx.sdf.org X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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:297783 Archived-At: Lars Ingebrigtsen writes: > Andrea Corallo writes: > >>>> So we need a recursion blocker in the trampoline generation function. >>> >>> Or -- since trampolines are really fast to generate and we need to do >>> that synchronously anyway -- we could just avoid forking an Emacs do >>> create the trampoline? >> >> We don't do that because libgccjit (well GCC really) leaks memory. > > Ah, darn. Then I guess we do have to fork, and then come up with some > kind of way to tell that forked Emacs to not recurse any further? Yes > (Do you know whether libgccjit might stop leaking memory at some point?) Yes, there must be a bug on bugzilla ATM I've no trace of. A colleague of mine did some investigation in the past and discovered IIRC that the GCC driver was the main source of the leakage. I'm Ccing him now hopefully he recalls/knows more than me. Also I think there was some fixing in this area but even in case is fixed completly now we'll have to cope with older version for a while. Andrea