build: Define G_THREADS_MANDATORY everywhere

We require threads to be supported in any case and defining this
will simplify the mutex, condition variable, etc. macros from gthread
to not always check if threads are really supported.

Fixes bug #607481.

configure.ac

@@ -619,7 +619,7 @@ dnl - src and build dirs need to be added because every piece that gets built
 dnl   will need the GStreamer source and generated headers
 dnl LIBS: XML doesn't need to be added because we don't explicitly use symbols
 dnl       from LibXML except for in the core library
-GST_ALL_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir) -I\$(top_builddir)/libs -I\$(top_builddir) $GLIB_CFLAGS $XML_CFLAGS \$(GST_OPTION_CFLAGS)"
+GST_ALL_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir) -I\$(top_builddir)/libs -I\$(top_builddir) $GLIB_CFLAGS $XML_CFLAGS \$(GST_OPTION_CFLAGS) -DG_THREADS_MANDATORY"
 
 dnl FIXME: check if LTLIBINTL is needed everywhere
 dnl I presume it is given that it contains the symbols that _() stuff maps to

gst/gst.c

@@ -364,7 +364,11 @@ gst_init_get_option_group (void)
    * called gst_init() yet or initialised the threading system otherwise, we
    * better issue a warning here (since chances are high that the application
    * has already called other GLib functions such as g_option_context_new() */
+#if GLIB_CHECK_VERSION (2,20,0)
+  if (!g_thread_get_initialized ()) {
+#else
   if (!g_thread_supported ()) {
+#endif
     g_warning ("The GStreamer function gst_init_get_option_group() was\n"
         "\tcalled, but the GLib threading system has not been initialised\n"
         "\tyet, something that must happen before any other GLib function\n"
@@ -417,7 +421,11 @@ gst_init_check (int *argc, char **argv[], GError ** err)
 #endif
   gboolean res;
 
+#if GLIB_CHECK_VERSION (2,20,0)
+  if (!g_thread_get_initialized ())
+#else
   if (!g_thread_supported ())
+#endif
     g_thread_init (NULL);
 
   if (gst_initialized) {
@@ -514,8 +522,8 @@ prepare_for_load_plugin_func (gpointer data, gpointer user_data)
 
 #ifndef GST_DISABLE_OPTION_PARSING
 static void
-split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
-    gpointer user_data)
+split_and_iterate (const gchar * stringlist, gchar * separator,
+    GFunc iterator, gpointer user_data)
 {
   gchar **strings;
   gint j = 0;
@@ -562,7 +570,11 @@ init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
   g_type_init ();
 
   /* we need threading to be enabled right here */
+#if GLIB_CHECK_VERSION (2,20,0)
+  g_assert (g_thread_get_initialized ());
+#else
   g_assert (g_thread_supported ());
+#endif
   _gst_debug_init ();
 
 #ifdef ENABLE_NLS

pkgconfig/gstreamer-uninstalled.pc.in

@@ -11,4 +11,4 @@ Description: Streaming media framework, Not Installed
 Version: @VERSION@
 Requires: @GST_PKG_DEPS@@LIBXML_PKG@
 Libs: ${libdir}/gst/libgstreamer-@GST_MAJORMINOR@.la
-Cflags: -I${includedir}  -I@srcdir@/.. -I${includedir}/libs  -I@srcdir@/../libs
+Cflags: -I${includedir}  -I@srcdir@/.. -I${includedir}/libs  -I@srcdir@/../libs -DG_THREADS_MANDATORY

pkgconfig/gstreamer.pc.in

@@ -10,4 +10,4 @@ Description: Streaming media framework
 Requires: @GST_PKG_DEPS@@LIBXML_PKG@
 Version: @VERSION@
 Libs: -L${libdir} -lgstreamer-@GST_MAJORMINOR@
-Cflags: -I${includedir}
+Cflags: -I${includedir} -DG_THREADS_MANDATORY