merge 2.6.0 to trunk

Author: jieluo@google.com

python/README.txt

@@ -48,8 +48,8 @@ Installation
      $ python setup.py build
      $ python setup.py google_test
 
-     if you want to test c++ implementation, run:
-     $ python setup.py test
+     If you want to test c++ implementation, run:
+     $ python setup.py test --cpp_implementation
 
    If some tests fail, this library may not work correctly on your
    system.  Continue at your own risk.
@@ -66,7 +66,7 @@ Installation
 
      $ python setup.py install
      or:
-     $ python setup.py install --nocpp_implementation
+     $ python setup.py install --cpp_implementation
 
    This step may require superuser privileges.
    NOTE: To use C++ implementation, you need to install C++ protobuf runtime
@@ -84,8 +84,6 @@ web at:
 C++ Implementation
 ==================
 
-WARNING: This is EXPERIMENTAL and only available for CPython platforms.
-
 The C++ implementation for Python messages is built as a Python extension to
 improve the overall protobuf Python performance.
 

python/setup.py

@@ -138,10 +138,9 @@ def run(self):
 
 if __name__ == '__main__':
   ext_module_list = []
-  nocpp = '--nocpp_implementation'
-  if nocpp in sys.argv:
+  cpp_impl = '--cpp_implementation'
+  if cpp_impl in sys.argv:
     sys.argv.remove(cpp_impl)
-  else:
     # C++ implementation extension
     ext_module_list.append(Extension(
         "google.protobuf.pyext._message",