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Message-ID:	<520D60D3.3050505@cs.utoronto.ca>
Date:	Thu, 15 Aug 2013 19:14:27 -0400
From:	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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To:	cygwin AT cygwin DOT com
Subject:	Re: 64-bit emacs crashes a lot
References:	<51F3151D DOT 7040000 AT cs DOT utoronto DOT ca> <51F33565 DOT 1090406 AT cornell DOT edu> <51F33F52 DOT 4060405 AT cs DOT utoronto DOT ca> <51FB1D9E DOT 5090102 AT cs DOT utoronto DOT ca> <20130802080211 DOT GA18054 AT calimero DOT vinschen DOT de> <51FB9228 DOT 2020309 AT cornell DOT edu> <51FBA100 DOT 90005 AT cs DOT utoronto DOT ca> <51FD5462 DOT 5020400 AT cs DOT utoronto DOT ca> <51FFBDFF DOT 7040501 AT cornell DOT edu> <51FFC4F2 DOT 8080909 AT cs DOT utoronto DOT ca> <5203D89E DOT 6030801 AT cornell DOT edu> <5203DCCA DOT 1010105 AT cs DOT utoronto DOT ca> <5205B364 DOT 8090007 AT cs DOT utoronto DOT ca> <52064730 DOT 50404 AT cornell DOT edu> <"52065B3C DOT 6060104 AT cs DOT utoronto <520CCA41.3000107"@cs.utoronto.ca> <520D089A DOT 1020806 AT cornell DOT edu> <83ioz6op5v DOT fsf AT gnu DOT org> <520D4036 DOT 8010303 AT cs DOT utoronto DOT ca> <520D44B9 DOT 7090206 AT cornell DOT edu> <520D4725 DOT 3030503 AT cs DOT utoronto DOT ca> <520D4F07 DOT 8050007 AT cornell DOT edu> <520D4FF7 DOT 5040405 AT cornell DOT edu> <520D5AA6 DOT 2010003 AT cs DOT utoronto DOT ca>
In-Reply-To:	<520D5AA6.2010003@cs.utoronto.ca>

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.

Ryan


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