diff --git a/tools/building.py b/tools/building.py
index e807188151..8e11de73e8 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -389,6 +389,16 @@ def PrepareModuleBuilding(env, root_directory, bsp_directory):
     PreProcessor.process_contents(contents)
     BuildOptions = PreProcessor.cpp_namespace
 
+    AddOption('--buildlib',
+                      dest = 'buildlib',
+                      type = 'string',
+                      help = 'building library of a component')
+    AddOption('--cleanlib',
+                      dest = 'cleanlib',
+                      action = 'store_true',
+                      default = False,
+                      help = 'clean up the library by --buildlib')
+
     # add program path
     env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
 
@@ -607,7 +617,7 @@ def DefineGroup(name, src, depend, **parameters):
             paths.append(os.path.abspath(item))
         group['LOCAL_CPPPATH'] = paths
 
-    
+
     if rtconfig.PLATFORM == 'gcc':
         if 'CFLAGS' in group:
             group['CFLAGS'] = utils.GCCC99Patch(group['CFLAGS'])
diff --git a/tools/options.py b/tools/options.py
index 3db1e8b653..947a0259f9 100644
--- a/tools/options.py
+++ b/tools/options.py
@@ -26,8 +26,8 @@ from SCons.Script import AddOption
 import platform
 
 def AddOptions():
-    ''' ===== Add options to SCons ===== '''
-    
+    ''' ===== Add generic options to SCons ===== '''
+
     AddOption('--dist',
                       dest = 'make-dist',
                       action = 'store_true',
@@ -120,4 +120,3 @@ def AddOptions():
                     action = 'store_true',
                     default = False,
                     help = 'make menuconfig for RT-Thread BSP')
-