fix-gui-gtk-fork-issue.diff

diff -r 273fbf501965 src/gui.c
--- a/src/gui.c	Mon Apr 30 21:09:43 2012 +0200
+++ b/src/gui.c	Tue May 01 19:32:14 2012 +0900
@@ -270,6 +270,12 @@
     }
     /* Child */
 
+#ifdef FEAT_GUI_GTK
+    /* Call gtk_init_check() here. See gui_init_check(). */
+    if (gui_mch_init_check() != OK)
+	exit(1);
+#endif
+
 # if defined(HAVE_SETSID) || defined(HAVE_SETPGID)
     /*
      * Change our process group.  On some systems/shells a CTRL-C in the
@@ -430,7 +436,16 @@
 #ifdef ALWAYS_USE_GUI
     result = OK;
 #else
+# ifdef FEAT_GUI_GTK
+    /*
+     * Note: Don't call gtk_init(), gtk_init_check() before fork.
+     * This will be called after the fork. When calling that before fork,
+     * it make vim hang for a while. See gui_do_fork().
+     */
+    result = gui.dofork ? OK : gui_mch_init_check();
+# else
     result = gui_mch_init_check();
+# endif
 #endif
     return result;
 }

should be:

#ifdef FEAT_GUI_GTK
      /* Call gtk_init_check() here. See gui_init_check(). */
      if (gui_mch_init_check() != OK)
       exit(1);
#endif

What do you mean?

I mean we should use "#ifdef FEAT_GUI_GTK", but not use "#ifndef" in child process.

I tested your patch in Ubuntu 12.04, if change "#ifndef" -> "#ifdef", then everything is Ok.

Ah, I noticed it just now. hehehe.
Thanks for your notice.