build: Require GLib 2.32 or above

GLib 2.32 has been released in March 2012, so we can now require it a
build and run time. This allows us to remove GLib 2.31 conditionals,
mark the Thread.Init as obsolete, and remove all references to
libgthread.

Please note that the API exposed in glib and gio is still from 2.28, but
we will have some API additions in the future. First example is the next
commit, which brings GBytes, an addition in GLib 2.32.

configure.ac

@@ -180,7 +180,7 @@ AC_SUBST(GENERATED_SOURCES_OPTION)
 AC_SUBST(ASSEMBLYINFO)
 
 GTK_REQUIRED_VERSION=3.0.0
-GLIB_REQUIRED_VERSION=2.28.0
+GLIB_REQUIRED_VERSION=2.32.0
 
 PKG_CHECK_MODULES(GLIB, gobject-2.0 >= $GLIB_REQUIRED_VERSION)
 AC_SUBST(GLIB_CFLAGS)
@@ -193,13 +193,6 @@ AC_SUBST(GIO_LIBS)
 CSFLAGS="$CSFLAGS $DEBUG_FLAGS $WIN64DEFINES"
 AC_SUBST(CSFLAGS)
 
-PKG_CHECK_MODULES(GLIB_2_31,
-	glib-2.0 >= 2.31,
-	HAVE_GLIB_2_31_OR_HIGHER=yes, HAVE_GLIB_2_31_OR_HIGHER=no)
-if test "x$HAVE_GLIB_2_31_OR_HIGHER" = "xno" ; then
-	CSFLAGS="$CSFLAGS -define:ENABLE_GTHREAD_INIT"
-fi
-
 PKG_CHECK_MODULES(PANGO, pango)
 AC_SUBST(PANGO_CFLAGS)
 AC_SUBST(PANGO_LIBS)

gio/gio-sharp.dll.config.in

@@ -2,5 +2,4 @@
   <dllmap dll="libgio-2.0-0.dll" target="libgio-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
   <dllmap dll="libglib-2.0-0.dll" target="libglib-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
   <dllmap dll="libgobject-2.0-0.dll" target="libgobject-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
-  <dllmap dll="libgthread-2.0-0.dll" target="libgthread-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
 </configuration>

glib/GType.cs

@@ -110,9 +110,6 @@ namespace GLib {
 
 		static GType ()
 		{
-			if (!GLib.Thread.Supported)
-				GLib.Thread.Init ();
-
 			g_type_init ();
 
 			Register (GType.Char, typeof (sbyte));

glib/Thread.cs

@@ -27,28 +27,8 @@ namespace GLib
 	public class Thread
 	{
 		private Thread () {}
-		
-#if ENABLE_GTHREAD_INIT
-		const string GThreadNativeLib = "libgthread-2.0-0.dll";
 
-		[DllImport (GThreadNativeLib, CallingConvention = CallingConvention.Cdecl)]
+		[Obsolete ("This is no longer needed, GLib automatically initializes threads")]
-		static extern void g_thread_init (IntPtr i);
-
-		public static void Init ()
-		{
-			g_thread_init (IntPtr.Zero);
-		}
-
-		[DllImport (GThreadNativeLib, CallingConvention = CallingConvention.Cdecl)]
-		static extern bool g_thread_get_initialized ();
-
-		public static bool Supported
-		{
-			get {
-				return g_thread_get_initialized ();
-			}
-		}
-#else
 		public static void Init ()
 		{
 			// GLib automatically inits threads in 2.31 and above
@@ -59,7 +39,6 @@ namespace GLib
 		{
 			get { return true; }
 		}
-#endif
 
 	}
 }

glib/glib-sharp.dll.config.in

@@ -1,5 +1,4 @@
 <configuration>
   <dllmap dll="libglib-2.0-0.dll" target="libglib-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
   <dllmap dll="libgobject-2.0-0.dll" target="libgobject-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
-  <dllmap dll="libgthread-2.0-0.dll" target="libgthread-2.0@LIB_PREFIX@.0@LIB_SUFFIX@"/>
 </configuration>

msi/unmanaged/unmanaged.wxs

@@ -1362,9 +1362,6 @@
           <Component Id="libgobject_2.0_0.dll" Guid="BDCAFC4C-F092-4244-BD06-2B95DB9229F9">
             <File Id="libgobject_2.0_0.dll" KeyPath="yes" Source="source\bin\libgobject-2.0-0.dll" />
           </Component>
-          <Component Id="libgthread_2.0_0.dll" Guid="55431703-86FC-47E8-B754-0960E50B712E">
-            <File Id="libgthread_2.0_0.dll" KeyPath="yes" Source="source\bin\libgthread-2.0-0.dll" />
-          </Component>
           <Component Id="libgtk_3_0.dll" Guid="14B44C8B-4EF6-43F3-8848-F8499E3885E8">
             <File Id="libgtk_3_0.dll" KeyPath="yes" Source="source\bin\libgtk-3-0.dll" />
           </Component>