From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: CHECK_STRUCTS/dmpstruct.h mechanism is broken. Date: Mon, 15 Apr 2019 07:14:30 -0700 Organization: UCLA Computer Science Department Message-ID: <46ecf22a-9c77-70c6-a5d8-7f90dfbeb672@cs.ucla.edu> References: <9809d5ce-c1c4-48e9-6dac-489431b34067@cs.ucla.edu> <671ba8dd-894b-5698-d162-8901b1098b9a@cs.ucla.edu> <83k1g04al8.fsf@gnu.org> <93b861b3-41d2-e590-d4b8-46a4bb64bfe8@cs.ucla.edu> <8736mmxr2e.fsf@Rainer.invalid> <87h8b1yrsi.fsf@Rainer.invalid> <20190415113125.GA6213@ACM> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="41137"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 Cc: Achim Gratz , emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 15 16:15:19 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hG2OF-000AYV-BE for ged-emacs-devel@m.gmane.org; Mon, 15 Apr 2019 16:15:19 +0200 Original-Received: from localhost ([127.0.0.1]:50845 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG2OE-00049I-5R for ged-emacs-devel@m.gmane.org; Mon, 15 Apr 2019 10:15:18 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:51695) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG2Nc-000495-P7 for emacs-devel@gnu.org; Mon, 15 Apr 2019 10:14:41 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hG2NY-0002Qa-Ne for emacs-devel@gnu.org; Mon, 15 Apr 2019 10:14:40 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:40430) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hG2NY-0002Q6-Fj for emacs-devel@gnu.org; Mon, 15 Apr 2019 10:14:36 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 6A8351616EB; Mon, 15 Apr 2019 07:14:34 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id R9WhU2glA8TO; Mon, 15 Apr 2019 07:14:31 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 848581616FE; Mon, 15 Apr 2019 07:14:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 22bmKcnbWUoG; Mon, 15 Apr 2019 07:14:31 -0700 (PDT) Original-Received: from [192.168.1.9] (cpe-23-242-74-103.socal.res.rr.com [23.242.74.103]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 43D0D1616EA; Mon, 15 Apr 2019 07:14:31 -0700 (PDT) In-Reply-To: <20190415113125.GA6213@ACM> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:235481 Archived-At: Alan Mackenzie wrote: > Is there anything particular about Autoconf that > makes it difficult to parallelise, or is it just a case of nobody > stepping up to do the work? Autoconf does not keep track of dependencies, and attempting to add dependency tracking would require a significant internal redesign. A plausible approach would be to turn 'configure' into a front-end to a GNU makefile instead of being a sequential shell script. (Alternatively I suppose one could try to keep track of dependencies in the shell; good luck with that!) There would be significant changes to the Autoconf input language. Plus I expect there would be a new requirement for GNU Make, which would be a show-stopper for some projects. For compatibility we'd need to continue to support older sequential configure.ac files. I'm not saying it couldn't be done, only that it's a much bigger deal than simply moving Emacs away from Autoconf. "Nobody stepping up to do the work" is also a factor, of course.