Merge pull request #21285 from lidizheng/add-ignores

Add side-products of Python compilation to gitignore

.gitignore

@@ -19,6 +19,8 @@ py27_gevent/
 py27_native/
 py3[0-9]_gevent/
 py3[0-9]_native/
+a.out
+src/python/grpcio_*/LICENSE
 
 # Node installation output
 node_modules

src/python/grpcio/commands.py

@@ -217,6 +217,7 @@ class BuildExt(build_ext.build_ext):
             """Test if default compiler is okay with specifying c++ version
             when invoked in C mode. GCC is okay with this, while clang is not.
             """
+            # TODO(lidiz) Remove the generated a.out for success tests.
             cc_test = subprocess.Popen(
                 ['cc', '-x', 'c', '-std=c++11', '-'],
                 stdin=subprocess.PIPE,