From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#15880: Compute C declarations for DEFSYMs automatically. Date: Thu, 14 Nov 2013 05:47:43 +0200 Message-ID: <83zjp7zlsw.fsf@gnu.org> References: <5282C8F4.5010806@cs.ucla.edu> <83habg1e15.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1384400952 19995 80.91.229.3 (14 Nov 2013 03:49:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Nov 2013 03:49:12 +0000 (UTC) Cc: eggert@cs.ucla.edu, 15880@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Nov 14 04:49:16 2013 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Vgnve-0005y9-Pf for geb-bug-gnu-emacs@m.gmane.org; Thu, 14 Nov 2013 04:49:14 +0100 Original-Received: from localhost ([::1]:53231 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Vgnve-00047s-Do for geb-bug-gnu-emacs@m.gmane.org; Wed, 13 Nov 2013 22:49:14 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:52246) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VgnvX-00046r-7O for bug-gnu-emacs@gnu.org; Wed, 13 Nov 2013 22:49:11 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VgnvS-0005gG-HY for bug-gnu-emacs@gnu.org; Wed, 13 Nov 2013 22:49:07 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:37058) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VgnvS-0005gB-Dj for bug-gnu-emacs@gnu.org; Wed, 13 Nov 2013 22:49:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1VgnvS-00042h-6P for bug-gnu-emacs@gnu.org; Wed, 13 Nov 2013 22:49:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 14 Nov 2013 03:49:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 15880 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 15880-submit@debbugs.gnu.org id=B15880.138440088615473 (code B ref 15880); Thu, 14 Nov 2013 03:49:02 +0000 Original-Received: (at 15880) by debbugs.gnu.org; 14 Nov 2013 03:48:06 +0000 Original-Received: from localhost ([127.0.0.1]:51077 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VgnuY-00041U-86 for submit@debbugs.gnu.org; Wed, 13 Nov 2013 22:48:06 -0500 Original-Received: from mtaout20.012.net.il ([80.179.55.166]:41682) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VgnuW-00040y-Bw for 15880@debbugs.gnu.org; Wed, 13 Nov 2013 22:48:05 -0500 Original-Received: from conversion-daemon.a-mtaout20.012.net.il by a-mtaout20.012.net.il (HyperSendmail v2007.08) id <0MW800F00I98UD00@a-mtaout20.012.net.il> for 15880@debbugs.gnu.org; Thu, 14 Nov 2013 05:47:58 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout20.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MW800FV1IJXJUE0@a-mtaout20.012.net.il>; Thu, 14 Nov 2013 05:47:58 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:80407 Archived-At: > From: Stefan Monnier > Cc: eggert@cs.ucla.edu, 15880@debbugs.gnu.org > Date: Wed, 13 Nov 2013 17:00:36 -0500 > > >> I'm wondering about one issue, tho: this creates a "big single file > >> dependency", so addition/removal of a DEFSYM somewhere causes > >> recompilation of all files. > > How is that different from changing variables and functions exposed to > > Lisp, and the dependency on globals.h? > > Fundamentally, it's no different, but I think that in practice it's > different for one reason: the type of a Qfoo variable is always > Lisp_Object, so there's never a need to recompile because that > object changed. So the cases where recompilation is warranted are > less frequent. Recompilation of C files is so fast nowadays that this kind of optimization gains very little, but can potentially cause waste of developers' time, whereby they will sometimes need to debug problems due to the fact that we did not recompile. So I think this would be a step backward, to the era when the dependency on lisp.h was suppressed for similar reasons.