third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/patches/0008-uninline_getemptystring_and_getemptystringalreadyinited.patch

+diff --git a/src/google/protobuf/generated_message_util.cc b/src/google/protobuf/generated_message_util.cc
+index 73f5592..c4c8eef 100644
+--- a/src/google/protobuf/generated_message_util.cc
++++ b/src/google/protobuf/generated_message_util.cc
+@@ -60,6 +60,15 @@ void InitEmptyString() {
+   OnShutdown(&DeleteEmptyString);
+ }
+ 
++const ::std::string& GetEmptyStringAlreadyInited() {

[Peter Kasting, 2016/11/22 20:28:23]

How come you switched to deinlining this?  It seems like doing so ought not to
have much effect.

[jbriance, 2016/11/22 22:11:31]

fixed_address_empty_string is not exported, and thus "is_component_build=true"
builds fail without deinlining (because of undefined reference to
'google::protobuf::internal::fixed_address_empty_string')

I just realize that I should have done this in the 0011 patch instead of this
one, because the comment in README.chromium is misleading.

++  return fixed_address_empty_string.get();
++}
++
++const ::std::string& GetEmptyString() {
++  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
++  return GetEmptyStringAlreadyInited();
++}
++
+ int StringSpaceUsedExcludingSelf(const string& str) {
+   const void* start = &str;
+   const void* end = &str + 1;
+diff --git a/src/google/protobuf/generated_message_util.h b/src/google/protobuf/generated_message_util.h
+index 8dc64c4..fda2631 100644
+--- a/src/google/protobuf/generated_message_util.h
++++ b/src/google/protobuf/generated_message_util.h
+@@ -116,14 +116,9 @@ LIBPROTOBUF_EXPORT extern ProtobufOnceType empty_string_once_init_;
+ LIBPROTOBUF_EXPORT void InitEmptyString();
+ 
+ 
+-LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyStringAlreadyInited() {
+-  return fixed_address_empty_string.get();
+-}
++LIBPROTOBUF_EXPORT const ::std::string& GetEmptyStringAlreadyInited();
+ 
+-LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
+-  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
+-  return GetEmptyStringAlreadyInited();
+-}
++LIBPROTOBUF_EXPORT const ::std::string& GetEmptyString();
+ 
+ LIBPROTOBUF_EXPORT int StringSpaceUsedExcludingSelf(const string& str);
+