diff --git a/libobjc/ChangeLog b/libobjc/ChangeLog
index 383d02f621c..569b6289515 100644
--- a/libobjc/ChangeLog
+++ b/libobjc/ChangeLog
@@ -1,3 +1,14 @@
+2010-10-16  Nicola Pero  <nicola.pero@meta-innovation.com>
+
+	* objc/runtime.h (class_getIvarLayout): New.
+	(class_getWeakIvarLayout): New.
+	(class_setIvarLayout): New.
+	(class_setWeakIvarLayout): New.
+	* ivars.c (class_getIvarLayout): New.
+	(class_getWeakIvarLayout): New.
+	(class_setIvarLayout): New.
+	(class_setWeakIvarLayout): New.	
+
 2010-10-15  Nicola Pero  <nicola.pero@meta-innovation.com>
 	
 	* objc/runtime.h (class_copyPropertyList): New.
diff --git a/libobjc/ivars.c b/libobjc/ivars.c
index b1e261bb8cc..827243a6c71 100644
--- a/libobjc/ivars.c
+++ b/libobjc/ivars.c
@@ -281,3 +281,29 @@ class_copyPropertyList (Class class_ __attribute__ ((__unused__)),
 
   return NULL;
 }
+
+const char *
+class_getIvarLayout (Class class_ __attribute__ ((__unused__)))
+{
+  return NULL;
+}
+
+const char *
+class_getWeakIvarLayout (Class class_ __attribute__ ((__unused__)))
+{
+  return NULL;
+}
+
+void
+class_setIvarLayout (Class class_ __attribute__ ((__unused__)),
+		     const char *layout __attribute__ ((__unused__)))
+{
+  return;
+}
+
+void
+class_setWeakIvarLayout (Class class_ __attribute__ ((__unused__)),
+			 const char *layout __attribute__ ((__unused__)))
+{
+  return;
+}
diff --git a/libobjc/objc/runtime.h b/libobjc/objc/runtime.h
index 27ecabf8850..0bbd7e9524e 100644
--- a/libobjc/objc/runtime.h
+++ b/libobjc/objc/runtime.h
@@ -336,6 +336,28 @@ objc_EXPORT Property class_getProperty (Class class_, const char *propertyName);
 objc_EXPORT Property * class_copyPropertyList 
 (Class class_, unsigned int *numberOfReturnedProperties);
 
+/* Return the ivar layout for class 'class_'.
+
+   At the moment this function always returns NULL.  */
+objc_EXPORT const char * class_getIvarLayout (Class class_);
+
+/* Return the weak ivar layout for class 'class_'.
+
+   At the moment this function always returns NULL.  */
+objc_EXPORT const char * class_getWeakIvarLayout (Class class_);
+
+/* Set the ivar layout for class 'class_'.
+
+   At the moment, this function does nothing.  */
+objc_EXPORT void class_setIvarLayout (Class class_, const char *layout);
+
+/* Set the weak ivar layout for class 'class_'.
+
+   At the moment, this function does nothing.  With the GNU runtime,
+   you should use class_ivar_set_gcinvisible () to hide variables from
+   the Garbage Collector.  */
+objc_EXPORT void class_setWeakIvarLayout (Class class_, const char *layout);
+
 
 /** Implementation: the following functions are in class.c.  */