From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andy Moreton Newsgroups: gmane.emacs.bugs Subject: bug#10164: 24.0.91; Instant crash enabling linum-mode Date: Wed, 30 Nov 2011 15:01:55 +0000 Message-ID: References: <4ED58F60.4000604@code-affinity.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1322665403 18174 80.91.229.12 (30 Nov 2011 15:03:23 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 30 Nov 2011 15:03:23 +0000 (UTC) To: 10164@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Nov 30 16:03:17 2011 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1RVlgq-0002w0-QS for geb-bug-gnu-emacs@m.gmane.org; Wed, 30 Nov 2011 16:03:17 +0100 Original-Received: from localhost ([::1]:48515 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RVlgn-00076J-4Y for geb-bug-gnu-emacs@m.gmane.org; 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Wed, 30 Nov 2011 10:02:27 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RVlft-0007Ip-5O for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 10:02:19 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:49299) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RVlfs-0007IW-Ey for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 10:02:16 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1RVlfn-0002RF-LT for bug-gnu-emacs@gnu.org; Wed, 30 Nov 2011 16:02:11 +0100 Original-Received: from 193.34.186.16 ([193.34.186.16]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 30 Nov 2011 16:02:11 +0100 Original-Received: from andrewjmoreton by 193.34.186.16 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 30 Nov 2011 16:02:11 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 44 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: 193.34.186.16 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (windows-nt) Cancel-Lock: sha1:PAPcLJ7ICM3LVyx0xJL7XVRV4uQ= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Wed, 30 Nov 2011 10:03:01 -0500 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) 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:54482 Archived-At: On Wed 30 Nov 2011, Dan Nicolaescu wrote: > Eli Zaretskii writes: > >>> Date: Tue, 29 Nov 2011 19:05:20 -0700 >>> From: Tim Crews >>> >>> Start Emacs with runemacs -Q --no-init-file >>> C-x C-f foo.txt >>> M-x linum-mode >>> (Emacs doesn't crash yet) >>> Type anything. Emacs instantly crashes. >> >> Arrgh! This is GCC 4.6.x "as-is" code reordering in action. Emacs >> crashes here: >> >> xassert (!row->enabled_p >> || row->mode_line_p >> || verify_row_hash (row)); >> >> Evidently, it calls verify_row_hash before it tests row->mode_line_p. > > Are you sure? Without interprocedural analysis the compiler cannot know > that `verify_row_hash' does not alter row->enabled_p, so it cannot > change the evaluation order. > BTW, the argument for row_hash should be const. The emacs build in this bug report is configured with system-configuration-options is a variable defined in `C source code'. Its value is "--with-gcc (4.6) --no-opt --cflags -ID:/devel/emacs/libs/libXpm-3.5.8/include -ID:/devel/emacs/libs/libXpm-3.5.8/src -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include -ID:/devel/emacs/libs/giflib-4.1.4-1/include -ID:/devel/emacs/libs/jpeg-6b-4/include -ID:/devel/emacs/libs/tiff-3.8.2-1/include -ID:/devel/emacs/libs/gnutls-2.10.1/include --ldflags -LD:/devel/emacs/libs/gnutls-2.10.1/lib" This does not include "-fno-omit-frame-pointer", which is known to important for MinGW GCC 4.6. Perhaps that is the real issue here ? AndyM