THRIFT-325. Remove a bunch of uses of the old command line format


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@745242 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/py/src/TSCons.py b/lib/py/src/TSCons.py
index dce1d01..11f31b2 100644
--- a/lib/py/src/TSCons.py
+++ b/lib/py/src/TSCons.py
@@ -9,7 +9,7 @@
 
 def scons_env(env, add=''):
   opath = path.dirname(path.abspath('$TARGET'))
-  lstr = 'thrift --cpp -o ' + opath + ' ' + add + ' $SOURCE'
+  lstr = 'thrift --gen cpp -o ' + opath + ' ' + add + ' $SOURCE'
   cppbuild = Builder(action = lstr)
   env.Append(BUILDERS = {'ThriftCpp' : cppbuild})