diff --git a/src/google/protobuf/arena.cc b/src/google/protobuf/arena.cc
index 2ce987cb2f..1853678140 100644
--- a/src/google/protobuf/arena.cc
+++ b/src/google/protobuf/arena.cc
@@ -38,7 +38,14 @@ namespace google {
 namespace protobuf {
 
 google::protobuf::internal::SequenceNumber Arena::lifecycle_id_generator_;
+#ifdef PROTOBUF_USE_DLLS
+Arena::ThreadCache& Arena::thread_cache() {
+  static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_ = { -1, NULL };
+  return thread_cache_;
+}
+#else
 GOOGLE_THREAD_LOCAL Arena::ThreadCache Arena::thread_cache_ = { -1, NULL };
+#endif
 
 void Arena::Init(const ArenaOptions& options) {
   lifecycle_id_ = lifecycle_id_generator_.GetNext();
@@ -130,18 +137,18 @@ void* Arena::AllocateAligned(size_t n) {
   // If this thread already owns a block in this arena then try to use that.
   // This fast path optimizes the case where multiple threads allocate from the
   // same arena.
-  if (thread_cache_.last_lifecycle_id_seen == lifecycle_id_ &&
-      thread_cache_.last_block_used_ != NULL) {
-    if (thread_cache_.last_block_used_->avail() < n) {
+  if (thread_cache().last_lifecycle_id_seen == lifecycle_id_ &&
+      thread_cache().last_block_used_ != NULL) {
+    if (thread_cache().last_block_used_->avail() < n) {
       return SlowAlloc(n);
     }
-    return AllocFromBlock(thread_cache_.last_block_used_, n);
+    return AllocFromBlock(thread_cache().last_block_used_, n);
   }
 
   // Check whether we own the last accessed block on this arena.
   // This fast path optimizes the case where a single thread uses multiple
   // arenas.
-  void* me = &thread_cache_;
+  void* me = &thread_cache();
   Block* b = reinterpret_cast<Block*>(google::protobuf::internal::Acquire_Load(&hint_));
   if (!b || b->owner != me || b->avail() < n) {
     // If the next block to allocate from is the first block, try to claim it
@@ -169,7 +176,7 @@ void* Arena::AllocFromBlock(Block* b, size_t n) {
 }
 
 void* Arena::SlowAlloc(size_t n) {
-  void* me = &thread_cache_;
+  void* me = &thread_cache();
   Block* b = FindBlock(me);  // Find block owned by me.
   // See if allocation fits in my latest block.
   if (b != NULL && b->avail() >= n) {
diff --git a/src/google/protobuf/arena.h b/src/google/protobuf/arena.h
index b5822bdbff..d0cb163c0a 100644
--- a/src/google/protobuf/arena.h
+++ b/src/google/protobuf/arena.h
@@ -312,7 +312,12 @@ class LIBPROTOBUF_EXPORT Arena {
 
   static const size_t kHeaderSize = sizeof(Block);
   static google::protobuf::internal::SequenceNumber lifecycle_id_generator_;
+#ifdef PROTOBUF_USE_DLLS
+  static ThreadCache& thread_cache();
+#else
   static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_;
+  static ThreadCache& thread_cache() { return thread_cache_; }
+#endif
 
   // SFINAE for skipping addition to delete list for a Type. This is mainly to
   // skip proto2/proto1 message objects with cc_enable_arenas=true from being
@@ -434,8 +439,8 @@ class LIBPROTOBUF_EXPORT Arena {
   void CleanupList();
 
   inline void SetThreadCacheBlock(Block* block) {
-    thread_cache_.last_block_used_ = block;
-    thread_cache_.last_lifecycle_id_seen = lifecycle_id_;
+    thread_cache().last_block_used_ = block;
+    thread_cache().last_lifecycle_id_seen = lifecycle_id_;
   }
 
   int64 lifecycle_id_;  // Unique for each arena. Changes on Reset().
diff --git a/src/google/protobuf/arenastring.h b/src/google/protobuf/arenastring.h
index 2adad16a73..d829ed9191 100755
--- a/src/google/protobuf/arenastring.h
+++ b/src/google/protobuf/arenastring.h
@@ -53,7 +53,7 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
-struct ArenaStringPtr {
+struct LIBPROTOBUF_EXPORT ArenaStringPtr {
   inline void Set(const ::std::string* default_value,
                   const ::std::string& value, ::google::protobuf::Arena* arena) {
     if (ptr_ == default_value) {
diff --git a/src/google/protobuf/compiler/cpp/cpp_unittest.cc b/src/google/protobuf/compiler/cpp/cpp_unittest.cc
index 20fcfa62e0..2a04b2931b 100644
--- a/src/google/protobuf/compiler/cpp/cpp_unittest.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_unittest.cc
@@ -153,6 +153,7 @@ TEST(GeneratedMessageTest, Defaults) {
             &message.optional_import_message());
 }
 
+#ifndef PROTOBUF_USE_DLLS
 TEST(GeneratedMessageTest, Int32StringConversion) {
   EXPECT_EQ("971", Int32ToString(971));
   EXPECT_EQ("(~0x7fffffff)", Int32ToString(kint32min));
@@ -165,6 +166,7 @@ TEST(GeneratedMessageTest, Int64StringConversion) {
   EXPECT_EQ("GOOGLE_LONGLONG(~0x7fffffffffffffff)", Int64ToString(kint64min));
   EXPECT_EQ("GOOGLE_LONGLONG(9223372036854775807)", Int64ToString(kint64max));
 }
+#endif  // !PROTOBUF_USE_DLLS
 
 TEST(GeneratedMessageTest, FloatingPointDefaults) {
   const unittest::TestExtremeDefaultValues& extreme_default =
diff --git a/src/google/protobuf/map.h b/src/google/protobuf/map.h
index f6ae3e52ef..6d8a9d03fb 100644
--- a/src/google/protobuf/map.h
+++ b/src/google/protobuf/map.h
@@ -110,7 +110,7 @@ class Map {
   ~Map() { clear(); }
 
   // Iterators
-  class LIBPROTOBUF_EXPORT const_iterator
+  class const_iterator
       : public std::iterator<std::forward_iterator_tag, value_type, ptrdiff_t,
                              const value_type*, const value_type&> {
     typedef typename hash_map<Key, value_type*>::const_iterator InnerIt;
@@ -139,7 +139,7 @@ class Map {
     InnerIt it_;
   };
 
-  class LIBPROTOBUF_EXPORT iterator : public std::iterator<std::forward_iterator_tag, value_type> {
+  class iterator : public std::iterator<std::forward_iterator_tag, value_type> {
     typedef typename hash_map<Key, value_type*>::iterator InnerIt;
 
    public:
@@ -302,7 +302,7 @@ class Map {
 
   template <typename K, typename V, FieldDescriptor::Type KeyProto,
             FieldDescriptor::Type ValueProto, int default_enum>
-  friend class LIBPROTOBUF_EXPORT internal::MapField;
+  friend class internal::MapField;
 };
 
 }  // namespace protobuf
diff --git a/src/google/protobuf/map_entry.h b/src/google/protobuf/map_entry.h
index 4d3fcfb6f1..217b15f6a3 100644
--- a/src/google/protobuf/map_entry.h
+++ b/src/google/protobuf/map_entry.h
@@ -45,7 +45,7 @@ namespace internal {
 
 // Register all MapEntry default instances so we can delete them in
 // ShutdownProtobufLibrary().
-void RegisterMapEntryDefaultInstance(MessageLite* default_instance);
+void LIBPROTOBUF_EXPORT RegisterMapEntryDefaultInstance(MessageLite* default_instance);
 
 // This is the common base class for MapEntry. It is used by MapFieldBase in
 // reflection api, in which the static type of key and value is unknown.
@@ -84,7 +84,7 @@ class LIBPROTOBUF_EXPORT MapEntryBase : public Message {
 // Moreover, default_enum_value is used to initialize enum field in proto2.
 template <typename Key, typename Value, FieldDescriptor::Type KeyProtoType,
           FieldDescriptor::Type ValueProtoType, int default_enum_value>
-class LIBPROTOBUF_EXPORT MapEntry : public MapEntryBase {
+class MapEntry : public MapEntryBase {
   // Handlers for key/value's proto field type. Used to infer internal layout
   // and provide parsing/serialization support.
   typedef MapProtoTypeHandler<KeyProtoType> KeyProtoHandler;
@@ -363,7 +363,7 @@ class LIBPROTOBUF_EXPORT MapEntry : public MapEntryBase {
   template <typename KeyNested, typename ValueNested,
             FieldDescriptor::Type KeyProtoNested,
             FieldDescriptor::Type ValueProtoNested, int default_enum>
-  class LIBPROTOBUF_EXPORT MapEntryWrapper
+  class MapEntryWrapper
       : public MapEntry<KeyNested, ValueNested, KeyProtoNested,
                         ValueProtoNested, default_enum> {
     typedef MapEntry<KeyNested, ValueNested, KeyProtoNested, ValueProtoNested,
@@ -394,7 +394,7 @@ class LIBPROTOBUF_EXPORT MapEntry : public MapEntryBase {
   template <typename KeyNested, typename ValueNested,
             FieldDescriptor::Type KeyProtoNested,
             FieldDescriptor::Type ValueProtoNested, int default_enum>
-  class LIBPROTOBUF_EXPORT MapEnumEntryWrapper
+  class MapEnumEntryWrapper
       : public MapEntry<KeyNested, ValueNested, KeyProtoNested,
                         ValueProtoNested, default_enum> {
     typedef MapEntry<KeyNested, ValueNested, KeyProtoNested, ValueProtoNested,
@@ -433,7 +433,7 @@ class LIBPROTOBUF_EXPORT MapEntry : public MapEntryBase {
   template <typename K, typename V,
             FieldDescriptor::Type KType,
             FieldDescriptor::Type VType, int default_enum>
-  friend class LIBPROTOBUF_EXPORT internal::MapField;
+  friend class internal::MapField;
   friend class LIBPROTOBUF_EXPORT internal::GeneratedMessageReflection;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntry);
diff --git a/src/google/protobuf/map_field.h b/src/google/protobuf/map_field.h
index 0fad1351fd..8516d74eaa 100644
--- a/src/google/protobuf/map_field.h
+++ b/src/google/protobuf/map_field.h
@@ -137,7 +137,7 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
 template<typename Key, typename T,
          FieldDescriptor::Type KeyProto,
          FieldDescriptor::Type ValueProto, int default_enum_value = 0>
-class LIBPROTOBUF_EXPORT MapField : public MapFieldBase {
+class MapField : public MapFieldBase {
   // Handlers for key/value's proto field type.
   typedef MapProtoTypeHandler<KeyProto> KeyProtoHandler;
   typedef MapProtoTypeHandler<ValueProto> ValueProtoHandler;
diff --git a/src/google/protobuf/message.h b/src/google/protobuf/message.h
index 1d8f249977..a200bc9290 100644
--- a/src/google/protobuf/message.h
+++ b/src/google/protobuf/message.h
@@ -967,6 +967,7 @@ const RepeatedField<TYPE>& Reflection::GetRepeatedField<TYPE>(   \
     const Message& message, const FieldDescriptor* field) const; \
                                                                  \
 template<>                                                       \
+LIBPROTOBUF_EXPORT                                               \
 RepeatedField<TYPE>* Reflection::MutableRepeatedField<TYPE>(     \
     Message* message, const FieldDescriptor* field) const;