Bump glib > 2.22, add compat file

We use API from 2.22, and some from further version. Add
virt-glib-compat.h fallback file for those.

configure.ac

@@ -12,7 +12,7 @@ AC_CANONICAL_HOST
 m4_ifndef([AM_SILENT_RULES], [m4_define([AM_SILENT_RULES],[])])
 AM_SILENT_RULES([yes])
 
-GLIB2_REQUIRED=2.12.0
+GLIB2_REQUIRED=2.22.0
 LIBXML2_REQUIRED="2.6.0"
 LIBVIRT_REQUIRED="0.9.7"
 GTK2_REQUIRED="2.18.0"

mingw32-virt-viewer.spec.in

@@ -21,6 +21,7 @@ Source0:        ftp://virt-manager.org/downloads/virt-viewer/virt-viewer-%{versi
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  mingw32-filesystem >= 23
+BuildRequires:  mingw32-glib2 >= 2.22
 %if %{with_gtk3}
 BuildRequires:  mingw32-gtk3 >= 3.0.0
 %else

src/Makefile.am

@@ -32,6 +32,7 @@ $(BUILT_SOURCES): %: %.etemplate $(ENUMS_FILES)
 
 COMMON_SOURCES =					\
 	$(BUILT_SOURCES)				\
+	virt-glib-compat.h				\
 	virt-gtk-compat.h				\
 	virt-viewer-util.h virt-viewer-util.c		\
 	virt-viewer-auth.h virt-viewer-auth.c		\

src/virt-glib-compat.h

@@ -0,0 +1,56 @@
+/*
+ * Virt Viewer: A virtual machine console viewer
+ *
+ * Copyright (C) 2007-2009 Red Hat, Inc.
+ * Copyright (C) 2009-2012 Daniel P. Berrange
+ * Copyright (C) 2010 Marc-André Lureau
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#include <config.h>
+
+#ifndef _VIRT_GLIB_COMPAT_H
+# define _VIRT_GLIB_COMPAT_H 1
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#ifndef g_clear_pointer
+#define g_clear_pointer(pp, destroy) \
+  G_STMT_START {                                                               \
+    G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer));                       \
+    /* Only one access, please */                                              \
+    gpointer *_pp = (gpointer *) (pp);                                         \
+    gpointer _p;                                                               \
+    /* This assignment is needed to avoid a gcc warning */                     \
+    GDestroyNotify _destroy = (GDestroyNotify) (destroy);                      \
+                                                                               \
+    (void) (0 ? (gpointer) *(pp) : 0);                                         \
+    do                                                                         \
+      _p = g_atomic_pointer_get (_pp);                                         \
+    while G_UNLIKELY (!g_atomic_pointer_compare_and_exchange (_pp, _p, NULL)); \
+                                                                               \
+    if (_p)                                                                    \
+      _destroy (_p);                                                           \
+  } G_STMT_END
+#endif
+
+G_END_DECLS
+
+#endif // _VIRT_GLIB_COMPAT_H

virt-viewer.spec.in

@@ -38,6 +38,7 @@ Requires(postun): %{_sbindir}/update-alternatives
 Requires(post): desktop-file-utils
 Requires(postun): desktop-file-utils
 
+BuildRequires: glib2-devel >= 2.22
 %if %{with_gtk3}
 BuildRequires: gtk3-devel >= 3.0.0
 %else