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Message-ID: <520D6707.4040902@cornell.edu>
Date: Thu, 15 Aug 2013 19:40:55 -0400
From: Ken Brown <kbrown@cornell.edu>
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To: cygwin@cygwin.com
Subject: Re: 64-bit emacs crashes a lot
References: <51F3151D.7040000@cs.utoronto.ca> <51F33565.1090406@cornell.edu> <51F33F52.4060405@cs.utoronto.ca> <51FB1D9E.5090102@cs.utoronto.ca> <20130802080211.GA18054@calimero.vinschen.de> <51FB9228.2020309@cornell.edu> <51FBA100.90005@cs.utoronto.ca> <51FD5462.5020400@cs.utoronto.ca> <51FFBDFF.7040501@cornell.edu> <51FFC4F2.8080909@cs.utoronto.ca> <5203D89E.6030801@cornell.edu> <5203DCCA.1010105@cs.utoronto.ca> <5205B364.8090007@cs.utoronto.ca> <52064730.50404@cornell.edu> <"52065B3C.6060104@cs.utoronto <520CCA41.3000107"@cs.utoronto.ca> <520D089A.1020806@cornell.edu> <83ioz6op5v.fsf@gnu.org> <520D4036.8010303@cs.utoronto.ca> <520D44B9.7090206@cornell.edu> <520D4725.3030503@cs.utoronto.ca> <520D4F07.8050007@cornell.edu> <520D4FF7.5040405@cornell.edu> <520D5AA6.2010003@cs.utoronto.ca> <520D60D3.3050505@cs.utoronto.ca>
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On 8/15/2013 7:14 PM, Ryan Johnson wrote:
> On 15/08/2013 6:48 PM, Ryan Johnson wrote:
>> On 15/08/2013 6:02 PM, Ken Brown wrote:
>>> On 8/15/2013 5:58 PM, Ken Brown wrote:
>>>> On 8/15/2013 5:24 PM, Ryan Johnson wrote:
>>>>> On 15/08/2013 5:14 PM, Ken Brown wrote:
>>>>>> On 8/15/2013 4:55 PM, Ryan Johnson wrote:
>>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>>> ___chkstk_ms () at
>>>>>>> /usr/src/debug/gcc-4.8.1-1/libgcc/config/i386/cygwin.S:146
>>>>>>
>>>>>> You're not using the latest gcc, which is 4.8.1-3.  Any chance that
>>>>>> that's your problem?
>>>>> Heh. I actually do have the latest gcc, but somehow the upgrade didn't
>>>>> pick up the debug package (which showed as not installed in
>>>>> setup.exe).
>>>>> I have manually upgraded it now.
>>>>
>>>> OK.  But doesn't the above show that the crash is occurring in gcc, not
>>>> emacs?
>>>>
>>>>> BTW, how do you compile emacs from the sources given? I tried
>>>>> untarring
>>>>> and patching, but I get the message:
>>>>>> configure: error: Emacs hasn't been ported to `x86_64-unknown-cygwin'
>>>>>> systems.
>>>>>> Check `etc/MACHINES' for recognized configuration names.
>>>>
>>>> One of the patches changes configure.ac, so you have to run autoreconf
>>>> after applying it.
>>>
>>> Or it might be 'autoreconf -I m4'.
>>
>> Something is still wrong:
>>
>> $ cd /scratch
>> $ tar xaf /usr/src/emacs-24.3.tar.xz
>> $ patch -p1 </usr/src/emacs-24.3-5.cygwin.patch
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs-X11.postinstall
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs-X11.preremove
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs-w32.postinstall
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs-w32.preremove
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs.postinstall
>> patching file emacs-24.3/CYGWIN-PATCHES/emacs.preremove
> Ah, it seems there's a /usr/src/configure.ac.patch that happens to
> belong to emacs...
>
> ... but unfortunately it seems that -fsanitize is only supported on
> Linux and Darwin right now, so there's little reason to build emacs
> unless you could use some particular information that a debug build
> provides. Rats.

But a build without optimization would make your backtraces more useful.

Ken

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