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Message-ID:	<520D6707.4040902@cornell.edu>
Date:	Thu, 15 Aug 2013 19:40:55 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: 64-bit emacs crashes a lot
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In-Reply-To:	<520D60D3.3050505@cs.utoronto.ca>

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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