Lower our glib requirement to 2.22, as we claim

Required to build on RHEL, even upcoming 6.3

gtk/Makefile.am

@@ -185,6 +185,7 @@ USB_ACL_HELPER_SRCS =
 endif
 
 libspice_client_glib_2_0_la_SOURCES =	\
+	glib-compat.c			\
 	glib-compat.h			\
 	spice-audio.c			\
 	spice-audio-priv.h		\
@@ -366,6 +367,8 @@ spicy_CPPFLAGS =			\
 
 if WITH_POLKIT
 spice_client_glib_usb_acl_helper_SOURCES =	\
+	glib-compat.c				\
+	glib-compat.h				\
 	spice-client-glib-usb-acl-helper.c	\
 	$(NULL)
 

gtk/channel-usbredir.c

@@ -34,6 +34,7 @@
 #include "spice-common.h"
 
 #include "spice-channel-priv.h"
+#include "glib-compat.h"
 
 /**
  * SECTION:channel-usbredir

gtk/glib-compat.c

@@ -0,0 +1,49 @@
+/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "glib-compat.h"
+
+#if !GLIB_CHECK_VERSION(2,26,0)
+G_DEFINE_BOXED_TYPE (GError, spice_error, g_error_copy, g_error_free)
+#endif
+
+#if !GLIB_CHECK_VERSION(2,28,0)
+/**
+ * spice_simple_async_result_take_error: (skip)
+ * @simple: a #GSimpleAsyncResult
+ * @error: a #GError
+ *
+ * Sets the result from @error, and takes over the caller's ownership
+ * of @error, so the caller does not need to free it any more.
+ *
+ * Since: 2.28
+ **/
+G_GNUC_INTERNAL void
+g_simple_async_result_take_error (GSimpleAsyncResult *simple,
+                                  GError             *error)
+{
+    /* this code is different from upstream */
+    /* we can't avoid extra copy/free, since the simple struct is
+       opaque */
+    g_simple_async_result_set_from_error (simple, error);
+    g_error_free (error);
+}
+#endif
+
+#if !GLIB_CHECK_VERSION(2,30,0)
+G_DEFINE_BOXED_TYPE (GMainContext, spice_main_context, g_main_context_ref, g_main_context_unref)
+#endif
+

gtk/glib-compat.h

@@ -17,6 +17,7 @@
 #define GLIB_COMPAT_H
 
 #include <glib-object.h>
+#include <gio/gio.h>
 
 #if !GLIB_CHECK_VERSION(2,26,0)
 #define G_DEFINE_BOXED_TYPE(TypeName, type_name, copy_func, free_func) G_DEFINE_BOXED_TYPE_WITH_CODE (TypeName, type_name, copy_func, free_func, {})
@@ -60,8 +61,47 @@ type_name##_get_type (void) \
                                       (GBoxedFreeFunc) free_func); \
       { /* custom code follows */
 #endif /* __GNUC__ */
+
+#define g_source_set_name(source, name) G_STMT_START { } G_STMT_END
+
+#define G_TYPE_ERROR (spice_error_get_type ())
+GType spice_error_get_type (void) G_GNUC_CONST;
+
+#if    __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+#define G_GNUC_DEPRECATED_FOR(f)                        \
+  __attribute__((deprecated("Use " #f " instead")))
+#else
+#define G_GNUC_DEPRECATED_FOR(f)        G_GNUC_DEPRECATED
+#endif /* __GNUC__ */
+
+#define G_PARAM_DEPRECATED  (1 << 31)
 #endif /* glib 2.26 */
 
+#if !GLIB_CHECK_VERSION(2,28,0)
+#define g_clear_object(object_ptr) \
+  G_STMT_START {                                                             \
+    /* Only one access, please */                                            \
+    gpointer *_p = (gpointer) (object_ptr);                                  \
+    gpointer _o;                                                             \
+                                                                             \
+    do                                                                       \
+      _o = g_atomic_pointer_get (_p);                                        \
+    while G_UNLIKELY (!g_atomic_pointer_compare_and_exchange (_p, _o, NULL));\
+                                                                             \
+    if (_o)                                                                  \
+      g_object_unref (_o);                                                   \
+  } G_STMT_END
+
+void
+g_simple_async_result_take_error(GSimpleAsyncResult *simple,
+                                 GError             *error);
+#endif /* glib 2.28 */
+
+#if !GLIB_CHECK_VERSION(2,30,0)
+#define G_TYPE_MAIN_CONTEXT (spice_main_context_get_type ())
+GType spice_main_context_get_type (void) G_GNUC_CONST;
+#endif
+
 #if !GLIB_CHECK_VERSION(2,32,0)
 # define G_SIGNAL_DEPRECATED (1 << 9)
 #endif

gtk/spice-audio.c

@@ -51,6 +51,8 @@
 #include "spice-gstaudio.h"
 #endif
 
+#include "glib-compat.h"
+
 #define SPICE_AUDIO_GET_PRIVATE(obj)                                  \
     (G_TYPE_INSTANCE_GET_PRIVATE ((obj), SPICE_TYPE_AUDIO, SpiceAudioPrivate))
 

gtk/spice-client-glib-usb-acl-helper.c

@@ -33,6 +33,8 @@
 #include <polkit/polkit.h>
 #include <acl/libacl.h>
 
+#include "glib-compat.h"
+
 #define FATAL_ERROR(...) \
     do { \
         /* We print the error both to stdout, for the app invoking us and \

gtk/spice-session.c

@@ -28,6 +28,7 @@
 #include "ring.h"
 
 #include "gio-coroutine.h"
+#include "glib-compat.h"
 
 struct channel {
     SpiceChannel      *channel;

gtk/usb-acl-helper.c

@@ -26,6 +26,7 @@
 #include <string.h>
 
 #include "usb-acl-helper.h"
+#include "glib-compat.h"
 
 /* ------------------------------------------------------------------ */
 /* gobject glue                                                       */