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Date:	Fri, 12 Sep 2014 14:02:42 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: glib errors with latest gdb
References:	<53EB7607 DOT 3040004 AT cornell DOT edu> <20140813145714 DOT GK21106 AT calimero DOT vinschen DOT de> <20140828135712 DOT GV20700 AT calimero DOT vinschen DOT de>
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Hi Corinna,

On 8/28/2014 9:57 AM, Corinna Vinschen wrote:
> On Aug 13 16:57, Corinna Vinschen wrote:
>> On Aug 13 10:28, Ken Brown wrote:
>>> I'm getting errors with the latest gdb when trying to debug programs that
>>> depend on glib.  Here's an example, run from an xterm window:
>>>
>>> $ gdb /usr/bin/gvim
>>> GNU gdb (GDB) 7.8
>>> [...]
>>> Reading symbols from /usr/bin/gvim...(no debugging symbols found)...done.
>>> (gdb) r
>>> Starting program: /usr/bin/gvim
>>> [New Thread 4860.0x1b44]
>>> Traceback (most recent call last):
>>>    File "/usr/share/gdb/auto-load/usr/bin/cyggobject-2.0-0.dll-gdb.py", line
>>> 9, in <module>
>>>      from gobject import register
>>>    File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
>>>      import gdb.backtrace
>>> ImportError: No module named backtrace
>>
>> I see this error, too.  Unfortunately I'm not a python guru so this
>> is rather opaque to me.  gdb itself doesn't provide a gdb.backtrace
>> method, afaics.
>>
>> However, despite this message, gvim starts normally.  And emacs-nox as
>> well as many other CLI applications can be started just fine, too.
>>
>> But GDB hangs with emacs-X11 for some reason, even if I disable the
>> python modules.  From a quick GDB session it's not clear why this occurs :(
>
> I reported the problem upstream in a bugzilla entry already handling
> strange GDB hangs:
>
>    https://sourceware.org/bugzilla/show_bug.cgi?id=17247

That bug appears to be something different.  But I managed to fix the 
problem without actually understanding the code.  I looked at cgf's 
patches from his build of gdb-7.6.50-4, and I noticed that some of his 
changes didn't make it into your gdb-7.8-1.src.patch.  The missing ones 
are collected in the attached "cgf.patch" file.

If I apply that patch on top of your gdb-7.8-1.src.patch, the problem is 
gone.  (The python warning is still there, but it seems to be harmless.)

Ken


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