reconstruct USB host project directory

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2206 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/drivers/usb/SConscript

@@ -1,9 +1,14 @@
-Import('RTT_ROOT')
+# for module compiling
+import os
 from building import *
 
-cwd     = GetCurrentDir()
-src	= Glob('*.c')
-CPPPATH = [cwd]
-group = DefineGroup('Drivers', src, depend = ['RT_USING_USB_DEVICE'], CPPPATH = CPPPATH)
+cwd  = GetCurrentDir()
+objs = []
+list = os.listdir(cwd)
 
-Return('group')
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        objs = objs + SConscript(os.path.join(d, 'SConscript'))
+
+Return('objs')