diff --git a/tensorflow/c/eager/c_api.cc b/tensorflow/c/eager/c_api.cc
old mode 100644
new mode 100755
index dfb1c9a37644c7..1ccae3f138920b
--- a/tensorflow/c/eager/c_api.cc
+++ b/tensorflow/c/eager/c_api.cc
@@ -244,8 +244,8 @@ void TFE_ContextOptionsSetConfig(TFE_ContextOptions* options, const void* proto,
 }
 
 void TFE_ContextOptionsSetAsync(TFE_ContextOptions* options,
-                                unsigned char async) {
-  options->async = async;
+                                unsigned char enable) {
+  options->async = enable;
 }
 void TFE_ContextOptionsSetDevicePlacementPolicy(
     TFE_ContextOptions* options, TFE_ContextDevicePlacementPolicy policy) {
@@ -253,9 +253,9 @@ void TFE_ContextOptionsSetDevicePlacementPolicy(
 }
 
 TF_CAPI_EXPORT extern void TFE_ContextSetAsyncForThread(TFE_Context* ctx,
-                                                        unsigned char async,
+                                                        unsigned char enable,
                                                         TF_Status* status) {
-  status->status = ctx->context.SetAsyncForThread(async);
+  status->status = ctx->context.SetAsyncForThread(enable);
 }
 
 void TFE_DeleteContextOptions(TFE_ContextOptions* options) { delete options; }
diff --git a/tensorflow/c/eager/c_api.h b/tensorflow/c/eager/c_api.h
old mode 100644
new mode 100755
index a0ebc6fa0a22ed..eec2750d6eb3bc
--- a/tensorflow/c/eager/c_api.h
+++ b/tensorflow/c/eager/c_api.h
@@ -76,7 +76,7 @@ typedef enum TFE_ContextDevicePlacementPolicy {
 // Sets the default execution mode (sync/async). Note that this can be
 // overridden per thread using TFE_ContextSetAsyncForThread.
 TF_CAPI_EXPORT extern void TFE_ContextOptionsSetAsync(TFE_ContextOptions*,
-                                                      unsigned char async);
+                                                      unsigned char enable);
 
 TF_CAPI_EXPORT extern void TFE_ContextOptionsSetDevicePlacementPolicy(
     TFE_ContextOptions*, TFE_ContextDevicePlacementPolicy);
@@ -114,7 +114,7 @@ TFE_ContextGetDevicePlacementPolicy(TFE_Context*);
 
 // Overrides the execution mode (sync/async) for the current thread.
 TF_CAPI_EXPORT extern void TFE_ContextSetAsyncForThread(TFE_Context*,
-                                                        unsigned char async,
+                                                        unsigned char enable,
                                                         TF_Status* status);
 
 // A tensorflow.ServerDef specifies remote workers (in addition to the current
diff --git a/tensorflow/python/eager/pywrap_tfe.h b/tensorflow/python/eager/pywrap_tfe.h
old mode 100644
new mode 100755
index a916a75f00cafc..823c4078b86f89
--- a/tensorflow/python/eager/pywrap_tfe.h
+++ b/tensorflow/python/eager/pywrap_tfe.h
@@ -89,7 +89,7 @@ int MaybeRaiseExceptionFromStatus(const tensorflow::Status& status,
                                   PyObject* exception);
 
 // Returns the string associated with the passed-in python object.
-char* TFE_GetPythonString(PyObject* o);
+const char* TFE_GetPythonString(PyObject* o);
 
 // Returns a unique id on each call.
 int64_t get_uid();
diff --git a/tensorflow/python/eager/pywrap_tfe_src.cc b/tensorflow/python/eager/pywrap_tfe_src.cc
index 2d54555cd37e63..64cf36d079a624 100644
--- a/tensorflow/python/eager/pywrap_tfe_src.cc
+++ b/tensorflow/python/eager/pywrap_tfe_src.cc
@@ -216,7 +216,7 @@ bool ParseStringValue(const string& key, PyObject* py_value, TF_Status* status,
 #if PY_MAJOR_VERSION >= 3
   if (PyUnicode_Check(py_value)) {
     Py_ssize_t size = 0;
-    char* buf = PyUnicode_AsUTF8AndSize(py_value, &size);
+    const char* buf = PyUnicode_AsUTF8AndSize(py_value, &size);
     if (buf == nullptr) return false;
     *value = tensorflow::StringPiece(buf, size);
     return true;
@@ -825,7 +825,7 @@ int MaybeRaiseExceptionFromStatus(const tensorflow::Status& status,
   return -1;
 }
 
-char* TFE_GetPythonString(PyObject* o) {
+const char* TFE_GetPythonString(PyObject* o) {
   if (PyBytes_Check(o)) {
     return PyBytes_AsString(o);
   }
diff --git a/tensorflow/python/pywrap_tfe.i b/tensorflow/python/pywrap_tfe.i
old mode 100644
new mode 100755
index 157f2341e08467..e1c233cdd9f29d
--- a/tensorflow/python/pywrap_tfe.i
+++ b/tensorflow/python/pywrap_tfe.i
@@ -105,20 +105,29 @@ limitations under the License.
   }
 }
 
+// For const parameters in a function, SWIG pretty much ignores the const.
+// See: http://www.swig.org/Doc2.0/SWIG.html#SWIG_nn13
+// Hence the 'const_cast'.
 %typemap(in) const char* serialized_function_def {
-  $1 = TFE_GetPythonString($input);
+  $1 = const_cast<char*>(TFE_GetPythonString($input));
 }
 
+// For const parameters in a function, SWIG pretty much ignores the const.
+// See: http://www.swig.org/Doc2.0/SWIG.html#SWIG_nn13
+// Hence the 'const_cast'.
 %typemap(in) const char* device_name {
   if ($input == Py_None) {
     $1 = nullptr;
   } else {
-    $1 = TFE_GetPythonString($input);
+    $1 = const_cast<char*>(TFE_GetPythonString($input));
   }
 }
 
+// For const parameters in a function, SWIG pretty much ignores the const.
+// See: http://www.swig.org/Doc2.0/SWIG.html#SWIG_nn13
+// Hence the 'const_cast'.
 %typemap(in) const char* op_name {
-  $1 = TFE_GetPythonString($input);
+  $1 = const_cast<char*>(TFE_GetPythonString($input));
 }
 
 %typemap(in) (TFE_Context*) {
diff --git a/tensorflow/workspace.bzl b/tensorflow/workspace.bzl
old mode 100644
new mode 100755
index 34b4a66c41eccd..5c822857494b21
--- a/tensorflow/workspace.bzl
+++ b/tensorflow/workspace.bzl
@@ -365,14 +365,18 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
         },
     )
 
+    PROTOBUF_urls =[
+        "https://mirror.bazel.build/github.com/google/protobuf/archive/v3.6.0.tar.gz",
+        "https://github.com/google/protobuf/archive/v3.6.0.tar.gz",
+    ]
+    PROTOBUF_sha256 = "50a5753995b3142627ac55cfd496cebc418a2e575ca0236e29033c67bd5665f4"
+    PROTOBUF_strip_prefix = "protobuf-3.6.0"
+
     tf_http_archive(
         name = "protobuf_archive",
-        urls = [
-            "https://mirror.bazel.build/github.com/google/protobuf/archive/v3.6.0.tar.gz",
-            "https://github.com/google/protobuf/archive/v3.6.0.tar.gz",
-        ],
-        sha256 = "50a5753995b3142627ac55cfd496cebc418a2e575ca0236e29033c67bd5665f4",
-        strip_prefix = "protobuf-3.6.0",
+        urls = PROTOBUF_urls,
+        sha256 = PROTOBUF_sha256,
+        strip_prefix = PROTOBUF_strip_prefix,
     )
 
     # We need to import the protobuf library under the names com_google_protobuf
@@ -380,22 +384,16 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
     # Unfortunately there is no way to alias http_archives at the moment.
     tf_http_archive(
         name = "com_google_protobuf",
-        urls = [
-            "https://mirror.bazel.build/github.com/google/protobuf/archive/v3.6.0.tar.gz",
-            "https://github.com/google/protobuf/archive/v3.6.0.tar.gz",
-        ],
-        sha256 = "50a5753995b3142627ac55cfd496cebc418a2e575ca0236e29033c67bd5665f4",
-        strip_prefix = "protobuf-3.6.0",
+        urls = PROTOBUF_urls,
+        sha256 = PROTOBUF_sha256,
+        strip_prefix = PROTOBUF_strip_prefix,
     )
 
     tf_http_archive(
         name = "com_google_protobuf_cc",
-        urls = [
-            "https://mirror.bazel.build/github.com/google/protobuf/archive/v3.6.0.tar.gz",
-            "https://github.com/google/protobuf/archive/v3.6.0.tar.gz",
-        ],
-        sha256 = "50a5753995b3142627ac55cfd496cebc418a2e575ca0236e29033c67bd5665f4",
-        strip_prefix = "protobuf-3.6.0",
+        urls = PROTOBUF_urls,
+        sha256 = PROTOBUF_sha256,
+        strip_prefix = PROTOBUF_strip_prefix,
     )
 
     tf_http_archive(