GNU bug report logs - #24065
commit 09ece4d341a7 (Restore the calloc family) causes miscompile for gcc-5 and higher

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Markus Trippelsdorf <markus <at> trippelsdorf.de>
Subject: bug#24065: closed (Re: commit 09ece4d341a7 (Restore the calloc
 family) causes miscompile for gcc-5 and higher)
Date: Tue, 26 Jul 2016 07:09:01 +0000

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Your bug report

#24065: commit 09ece4d341a7 (Restore the calloc family) causes miscompile for gcc-5 and higher

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 24065 <at> debbugs.gnu.org.

-- 
24065: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24065
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Wolfgang Jenkner <wjenkner <at> inode.at>, markus <at> trippelsdorf.de
Cc: 24065-done <at> debbugs.gnu.org
Subject: Re: commit 09ece4d341a7 (Restore the calloc family) causes miscompile
 for gcc-5 and higher
Date: Tue, 26 Jul 2016 09:08:22 +0200

On 07/25/2016 05:48 PM, Wolfgang Jenkner wrote:
> IIUC, this commit removes  the declaration of __malloc_initialize_hook,
> so the emacs configure check for "whether malloc is Doug Lea style"
> will fail.

This problem should be fixed on Emacs master and emacs-25, as well as in 
the current release candidate for Emacs 25 
<ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-25.1-rc1.tar.xz>. If you're 
still observing the problem in any of these editions of Emacs, please 
let us know. In the meantime I will close the bug report as I think this 
bug is fixed now.

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From: Markus Trippelsdorf <markus <at> trippelsdorf.de>
To: bug-gnu-emacs <at> gnu.org
Cc: Wolfgang Jenkner <wjenkner <at> inode.at>
Subject: commit 09ece4d341a7 (Restore the calloc family) causes miscompile
 for gcc-5 and higher
Date: Mon, 25 Jul 2016 09:22:32 +0200

commit 09ece4d341a7e07fab7be22868ebcadae8641c79
Author: Wolfgang Jenkner <wjenkner <at> inode.at>
Date:   Tue Feb 9 15:04:40 2016 -0800

    Restore the calloc family.

causes gcc-5 and higher to compile calloc to an endless loop.
-fno-builtin-malloc should be used to work around the problem.

See: https://gcc.gnu.org/ml/gcc-help/2015-03/msg00109.html
for a similar example.


-- 
Markus

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