Re: Problems with emacs built against gtk3

[Ken Brown <kbrown@cornell.edu>]

On 11/30/2011 9:09 AM, Ken Brown wrote:
> On 11/29/2011 10:51 PM, Yaakov (Cygwin/X) wrote:
>> On Sat, 2011-11-26 at 08:40 -0500, Ken Brown wrote:
>>> On 11/25/2011 7:38 PM, Ken Brown wrote:
>>>> When I build emacs against gtk3, it is unusable. Here are the symptoms
>>>> when the resulting emacs is started in an xterm window:
>>>>
>>>> $ ./emacs -Q&
>>>> [1] 3344
>>>>
>>>> (emacs:3344): GLib-WARNING **: In call to g_spawn_sync(), exit
>>>> status of
>>>> a child process was requested but SIGCHLD action was set to SIG_IGN and
>>>> ECHILD was received by waitpid(), so exit status can't be returned.
>>>> This
>>>> is a bug in the program calling g_spawn_sync(); either don't request
>>>> the
>>>> exit status, or don't set the SIGCHLD action.
>>>>
>>>> ** (emacs:3344): WARNING **: Abnormal program termination spawning
>>>> command line `dbus-launch --autolaunch=0b8f184fe6d82872ee8db8724ecfdb90
>>>> --binary-syntax --close-stderr':
>>>>
>>>> I think the pango warning is Cygwin specific, but the rest of it might
>>>> not be. Similar symptoms were reported on Fedora:
>>>>
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=654027
>>
>> This appears to be the same bug. The solution is to launch a DBus
>> session bus *before* starting emacs (or any other gtk3 programs for that
>> matter), IOW:
>>
>> $ eval `dbus-launch --sh-syntax`
>> $ emacs-X11&
>
> That gets rid of the warning, but emacs still dies after a few seconds
> (no error message, no stackdump), unless I uninstall dconf-service. I'll
> see if I can get more information by running emacs under gdb. I'd
> appreciate any suggestions you might have as to where I should look.
>
> I forgot to say in my first post that the emacs I'm testing is a pretest
> of the upcoming emacs-24.1. If I'm not able to figure out what's going
> on, maybe I'll make an experimental version available so that you can
> try to reproduce the problem.

I have some further information: The problem is related to the GSettings 
backend.  If I uninstall dconf-service and start emacs, I get a warning 
that the GSettings `memory' backend will be used.  Emacs then works 
fine.  If I reinstall dconf-service but set GSETTINGS_BACKEND=memory 
before starting emacs, it again works fine.  Does this provide any clue 
as to what the problem might be?

Ken


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