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Date: Fri, 12 Sep 2014 14:40:52 -0400
From: Ken Brown <kbrown@cornell.edu>
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To: cygwin@cygwin.com
Subject: Re: glib errors with latest gdb
References: <53EB7607.3040004@cornell.edu> <20140813145714.GK21106@calimero.vinschen.de> <20140828135712.GV20700@calimero.vinschen.de> <54133542.80207@cornell.edu>
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On 9/12/2014 2:02 PM, Ken Brown wrote:
> 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.)

I'm not sure when Corinna will be back from vacation, but if anyone 
wants to test my fix in the meantime, you can get it from my Cygwin 
repository:

   http://sanibeltranquility.com/cygwin/

There are instructions at that URL.

Ken


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