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#17806: 24.4.50; Branch emacs-24 fails to beuild on Debian Date: Tue, 24 Jun 2014 19:39:15 +0300 Message-ID: <83r42eqn2k.fsf@gnu.org> References: <87ionxaloa.fsf@glaurung.internal.golden-gryphon.com> <53A3D1F8.3070306@cs.ucla.edu> <53A99196.3030308@yandex.ru> <53A9A706.70505@cs.ucla.edu> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1403628025 25348 80.91.229.3 (24 Jun 2014 16:40:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 24 Jun 2014 16:40:25 +0000 (UTC) Cc: dmantipov@yandex.ru, 17806@debbugs.gnu.org To: Paul Eggert Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Jun 24 18:40:17 2014 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 1WzTlY-0002Uj-UR for geb-bug-gnu-emacs@m.gmane.org; Tue, 24 Jun 2014 18:40:17 +0200 Original-Received: from localhost ([::1]:60950 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzTlY-0006tR-Aw for geb-bug-gnu-emacs@m.gmane.org; Tue, 24 Jun 2014 12:40:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:32950) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzTlQ-0006pB-VL for bug-gnu-emacs@gnu.org; Tue, 24 Jun 2014 12:40:14 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WzTlL-0002XS-Qm for bug-gnu-emacs@gnu.org; Tue, 24 Jun 2014 12:40:08 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:40124) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzTlL-0002XO-Ne for bug-gnu-emacs@gnu.org; Tue, 24 Jun 2014 12:40:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1WzTlK-0005kO-Dg for bug-gnu-emacs@gnu.org; Tue, 24 Jun 2014 12:40:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 24 Jun 2014 16:40:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17806 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 17806-submit@debbugs.gnu.org id=B17806.140362797522040 (code B ref 17806); Tue, 24 Jun 2014 16:40:02 +0000 Original-Received: (at 17806) by debbugs.gnu.org; 24 Jun 2014 16:39:35 +0000 Original-Received: from localhost ([127.0.0.1]:59507 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WzTkp-0005jJ-6H for submit@debbugs.gnu.org; Tue, 24 Jun 2014 12:39:34 -0400 Original-Received: from mtaout20.012.net.il ([80.179.55.166]:52062) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WzTkh-0005iu-Op for 17806@debbugs.gnu.org; Tue, 24 Jun 2014 12:39:27 -0400 Original-Received: from conversion-daemon.a-mtaout20.012.net.il by a-mtaout20.012.net.il (HyperSendmail v2007.08) id <0N7O00A00LX4Y800@a-mtaout20.012.net.il> for 17806@debbugs.gnu.org; Tue, 24 Jun 2014 19:39:17 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout20.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N7O00A55M9GLT80@a-mtaout20.012.net.il>; Tue, 24 Jun 2014 19:39:17 +0300 (IDT) In-reply-to: <53A9A706.70505@cs.ucla.edu> 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:90744 Archived-At: > Date: Tue, 24 Jun 2014 09:27:50 -0700 > From: Paul Eggert > Cc: 17806@debbugs.gnu.org > > Dmitry Antipov wrote: > > RedHat's compiler engineer claims that LTO has made substantial progress > > in gcc-4.9: http://vmakarov.fedorapeople.org/spec/2014/2014.html > > Those comments say that GCC 4.9.0 compiles much faster than GCC 4.8.3 > when LTO is used. And that's understandable: in 4.9.0, -flto defaults > to -fno-fat-lto-objects. Unfortunately, this is the change that broke > the Emacs build. Emacs has worked around the problem by compiling with > -ffat-lto-objects, but this negates the compile-time performance > advantage of 4.9.0. > > 4.9.0 has not made significant improvements in run-time performance over > 4.8.3 when LTO is used, and for Emacs LTO has only minor (and sometimes > even negative) run-time performance improvements compared to non-LTO. I wonder if we should say something about this in PROBLEMS. After all, LTO is the latest buzz-hot feature, so people will probably try it with Emacs.