add initial libdl

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1052 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/libdl/dlerror.c

@@ -0,0 +1,24 @@
+/*
+ * File      : dlerror.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author		Notes
+ * 2010-11-17      yi.qiu	first version
+ */
+
+#include <rtthread.h>
+#include <rtm.h>
+
+const char *rt_dlerror(void)
+{
+	return "TODO";
+}
+
+RTM_EXPORT(rt_dlerror)
+