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 15:23:15 -0700 Organization: UCLA Computer Science Department Message-ID: <93b861b3-41d2-e590-d4b8-46a4bb64bfe8@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> <83k1g04al8.fsf@gnu.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="125878"; 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: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Apr 12 00:23:59 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 1hEi6w-000Wdt-S3 for ged-emacs-devel@m.gmane.org; Fri, 12 Apr 2019 00:23:59 +0200 Original-Received: from localhost ([127.0.0.1]:55704 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEi6v-0006SE-Sg for ged-emacs-devel@m.gmane.org; Thu, 11 Apr 2019 18:23:57 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:37591) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEi6L-0006Rw-LP for emacs-devel@gnu.org; Thu, 11 Apr 2019 18:23:22 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hEi6K-00088l-MO for emacs-devel@gnu.org; Thu, 11 Apr 2019 18:23:21 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:53082) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hEi6I-00085l-G9; Thu, 11 Apr 2019 18:23:18 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id B34731616E2; Thu, 11 Apr 2019 15:23:16 -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 Rq4AyvXsaxAc; Thu, 11 Apr 2019 15:23:15 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id E2E3A1616E3; Thu, 11 Apr 2019 15:23:15 -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 wZKfifDYtQtb; Thu, 11 Apr 2019 15:23:15 -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 C089A1616DC; Thu, 11 Apr 2019 15:23:15 -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: <83k1g04al8.fsf@gnu.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:235312 Archived-At: On 4/11/19 12:15 PM, Eli Zaretskii wrote: > You want to test for system-dependent features with Make? How does > one do that? You execute the test as a 'make' rule that records the test's result as a makefile snippet (or as a .h file, or whatever). > Wouldn't we end up with heaps of Make wizardry only a few understand? Sure, just as we now have heaps of .m4 and shell etc. wizardry that only a few understand. (Think of it as the law of conservation of wizardry. :-) However, an advantage of using Make instead of M4 is that we already need to use Make anyway, so avoiding m4 means one less thing for developers to learn. Another advantage is that Make can easily run in parallel whereas 'configure' does not. > IME, the slowest part is byte compilation of Lisp files. Of course, > that is only a significant factor when you bootstrap or rebuild large > parts of Emacs, but still. Yes. Typically I don't recompile Lisp files so the bottleneck for me is 'configure'. Moreover, Lisp file recompilation is parallelized so it's reasonably fast on larger platforms (the wave of the future :-), whereas 'configure' will remain slow. I just now timed it, and './configure' took 29 real-time seconds whereas 'cd lisp; make -j16 compile-always' took 38 real-time seconds; this was with two circa-2013 Xeon E5-2640 v2 CPUs with 8 cores each. So on a 32-core platform, I expect ./configure to take longer than byte-compiling all the Lisp files - i.e., 'configure' is ridiculously slow.