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':
(emacs:3344): Pango-WARNING **: No such file or directory
A few seconds later, emacs dies (the window disappears and the process
is gone, with no error messages), and two dbus processes remain:
$ ps | grep dbus
5188 1 3344 5188 7 1002 19:07:31 /usr/bin/dbus-launch
6452 1 6452 6452 ? 1002 19:07:31 /usr/bin/dbus-daemon
If I start emacs again without killing the dbus processes, I don't get
the first two warnings but I still get the third. Again, emacs dies
after a few seconds.
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
But there are some differences, so I thought I should report it here
just in case part of the problem is Cygwin specific. My cygcheck output
is attached but probably not relevant.