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Date: Thu, 13 Oct 2011 18:36:33 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: Problem w/ gdb 7.3.50-2 under emacs
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On 10/13/2011 2:32 PM, Ryan Johnson wrote:
> On 13/10/2011 1:33 PM, Ryan Johnson wrote:
>> On 17/09/2011 8:51 AM, Ken Brown wrote:
>>> On 9/13/2011 11:48 PM, Bill Priest wrote:
>>>> All,
>>>> I updated gdb to 7.3.50-2 and I can no longer run M-x gdb under
>>>> emacs inside rxvt (gdb core dumps). Reverting back to 7.3.50-1 and it
>>>> works. The executable being debugged is built with gcc 4.5.3 and gdb
>>>> under rxvt and ddd works. Running M-x shell (/bin/sh) gdb also works.
>>>> Running M-x gdba fails identically to M-x gdb. The odd thing is
>>>> that after "Reading symbols ... done" nothing is typed and the
>>>> "Debugger segmentation fault (core dumped) occurs w/o typing a key.
>>>>
>>>> Bill
>>>>
>>>> t.c
>>>> --------------
>>>> #include<stdio.h>
>>>>
>>>> int main(void)
>>>> {
>>>> printf("Hello World\n");
>>>> return 0;
>>>> }
>>>> ---------------
>>>>
>>>> compiled with
>>>> gcc -Wall -g -o t t.c
>>>>
>>>>
>>>> Current directory is ~/
>>>> GNU gdb (GDB) 7.3.50.20110821-cvs (cygwin-special)
>>>> Copyright (C) 2011 Free Software Foundation, Inc.
>>>> License GPLv3+: GNU GPL version 3 or
>>>> later<http://gnu.org/licenses/gpl.html>
>>>> This is free software: you are free to change and redistribute it.
>>>> There is NO WARRANTY, to the extent permitted by law. Type "show
>>>> copying"
>>>> and "show warranty" for details.
>>>> This GDB was configured as "i686-cygwin".
>>>> For bug reporting instructions, please see:
>>>> <http://www.gnu.org/software/gdb/bugs/>...
>>>> Reading symbols from /home/wpriest/t.exe...done.
>>>> (gdb)
>>>> Debugger segmentation fault (core dumped)
>>>
>>> I can confirm this. Bug M-x gud-gdb seems to work fine. I realize,
>>> however, that it may not give you the graphical interface that you'd
>>> like.
>>>
>>> Notice that when you use M-x gdb, emacs calls gdb with the
>>> --annotate=3 option. A google search suggests that this option is
>>> obsolete. I don't know if that's part of the problem or not. I can
>>> run gdb with that option outside of emacs and it doesn't segfault.
>> I also encountered problems, though in my case gdb managed not only to
>> hang, but also took emacs with it... I had to revert to the older
>> version.
>>
>> Has anybody figured out what might be causing the issue?

I plan to try, but I haven't gotten to it yet.

> Update: gdb (previous version and home-built) doesn't seg fault, but is
> unable to run commands under the latest cygwin emacs: nothing happens
> when you hit [enter], though it usually responds to ^C and comes back to
> the gdb prompt. A home-built emacs works perfectly (at least, with the
> previous version of cygwin gdb).

Are you implying that the previous version of Cygwin gdb doesn't work 
with Cygwin emacs?  It works for the OP and for me.

Ken


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