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: Thu, 11 Apr 2019 15:47:51 -0700 Organization: UCLA Computer Science Department Message-ID: <0ecf6bfc-7f51-4de5-7c2b-e09c2b0da3d0@cs.ucla.edu> References: <20190228202146.GC4686@ACM> <20190228205955.GD4686@ACM> <20190410162203.GA4009@ACM> <9809d5ce-c1c4-48e9-6dac-489431b34067@cs.ucla.edu> <671ba8dd-894b-5698-d162-8901b1098b9a@cs.ucla.edu> <87v9zkqptq.fsf@Rainer.invalid> <4b117557f2ad040a178587a74ad4d998.squirrel@dancol.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="228043"; 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: emacs-devel@gnu.org To: Daniel Colascione , Achim Gratz Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Apr 12 00:48:35 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 1hEiUl-000xDa-61 for ged-emacs-devel@m.gmane.org; Fri, 12 Apr 2019 00:48:35 +0200 Original-Received: from localhost ([127.0.0.1]:55942 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEiUk-0005VH-7R for ged-emacs-devel@m.gmane.org; Thu, 11 Apr 2019 18:48:34 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:42127) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEiU8-0005VC-5P for emacs-devel@gnu.org; Thu, 11 Apr 2019 18:47:57 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hEiU7-00030L-8D for emacs-devel@gnu.org; Thu, 11 Apr 2019 18:47:56 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:57138) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hEiU5-0002yj-Mj for emacs-devel@gnu.org; Thu, 11 Apr 2019 18:47:55 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 124F71616D9; Thu, 11 Apr 2019 15:47:53 -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 lFSKSSDOUnLZ; Thu, 11 Apr 2019 15:47:52 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 492F416169E; Thu, 11 Apr 2019 15:47:52 -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 qQ7kkDkY42Jh; Thu, 11 Apr 2019 15:47:52 -0700 (PDT) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 1D505160942; Thu, 11 Apr 2019 15:47:52 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: <4b117557f2ad040a178587a74ad4d998.squirrel@dancol.org> 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:235317 Archived-At: On 4/11/19 3:10 PM, Daniel Colascione wrote: > I've also > found that alternative systems frequently have problems with complex > configurations like out-of-tree builds, cross compilation, various forms > of path overriding, and tool specification. autoconf dealt with all of > these issues a very long time ago. Yes, we want to continue to support the things you mention (except Emacs has never supported cross-compilation as far as I know). > 1) eliminating tests that have become unnecessary in the modern world, This would be nice, but will be tricky to do in Autoconf because many of these tests are baked into Autoconf. I'm not saying it can't be done, but at some point it may be better simply to dump Autoconf. > 2) adding an optimization pass that batched redundant tests Not sure what you mean by this. > 3) making caching Just Work, maybe by stracing and checking all inputs for > cache validation. I have my doubts about this. For one thing, we can't assume strace. Also, stracing is slow.