From 92a7e778e7394386f413cec28d67a07630f784b1 Mon Sep 17 00:00:00 2001
From: Adam Cozzette <acozzette@google.com>
Date: Fri, 1 Dec 2017 10:05:10 -0800
Subject: Integrated internal changes from Google

---
 src/google/protobuf/extension_set.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'src/google/protobuf/extension_set.cc')

diff --git a/src/google/protobuf/extension_set.cc b/src/google/protobuf/extension_set.cc
index cf6b6fb4..8f104800 100644
--- a/src/google/protobuf/extension_set.cc
+++ b/src/google/protobuf/extension_set.cc
@@ -33,6 +33,7 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #include <google/protobuf/stubs/hash.h>
+#include <utility>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/once.h>
 #include <google/protobuf/extension_set.h>
@@ -750,8 +751,10 @@ MessageLite* ExtensionSet::AddMessage(int number, FieldType type,
 
   // RepeatedPtrField<MessageLite> does not know how to Add() since it cannot
   // allocate an abstract object, so we have to be tricky.
-  MessageLite* result = extension->repeated_message_value
-      ->AddFromCleared<GenericTypeHandler<MessageLite> >();
+  MessageLite* result =
+      reinterpret_cast< ::google::protobuf::internal::RepeatedPtrFieldBase*>(
+          extension->repeated_message_value)
+          ->AddFromCleared<GenericTypeHandler<MessageLite> >();
   if (result == NULL) {
     result = prototype.New(arena_);
     extension->repeated_message_value->AddAllocated(result);
@@ -925,8 +928,10 @@ void ExtensionSet::InternalExtensionMergeFrom(
             other_extension.repeated_message_value;
         for (int i = 0; i < other_repeated_message->size(); i++) {
           const MessageLite& other_message = other_repeated_message->Get(i);
-          MessageLite* target = extension->repeated_message_value
-                   ->AddFromCleared<GenericTypeHandler<MessageLite> >();
+          MessageLite* target =
+              reinterpret_cast< ::google::protobuf::internal::RepeatedPtrFieldBase*>(
+                  extension->repeated_message_value)
+                  ->AddFromCleared<GenericTypeHandler<MessageLite> >();
           if (target == NULL) {
             target = other_message.New(arena_);
             extension->repeated_message_value->AddAllocated(target);
@@ -1747,6 +1752,9 @@ void ExtensionSet::Extension::Free() {
 // Defined in extension_set_heavy.cc.
 // int ExtensionSet::Extension::SpaceUsedExcludingSelf() const
 
+// Dummy key method to avoid weak vtable.
+void ExtensionSet::LazyMessageExtension::UnusedKeyMethod() {}
+
 // ==================================================================
 // Default repeated field instances for iterator-compatible accessors
 
-- 
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