Fixed DLL compile under MSVC.

src/google/protobuf/compiler/plugin.h

@@ -47,7 +47,7 @@ class CodeGenerator;    // code_generator.h
 //     MyCodeGenerator generator;
 //     return PluginMain(argc, argv, &generator);
 //   }
-int PluginMain(int argc, char* argv[], const CodeGenerator* generator);
+LIBPROTOC_EXPORT int PluginMain(int argc, char* argv[], const CodeGenerator* generator);
 
 }  // namespace compiler
 }  // namespace protobuf

src/google/protobuf/extension_set.h

@@ -136,24 +136,8 @@ class LIBPROTOBUF_EXPORT GeneratedExtensionFinder : public ExtensionFinder {
   const MessageLite* containing_type_;
 };
 
-// Implementation of ExtensionFinder which finds extensions in a given
-// DescriptorPool, using the given MessageFactory to construct sub-objects.
-// This class is implemented in extension_set_heavy.cc.
-class LIBPROTOBUF_EXPORT DescriptorPoolExtensionFinder : public ExtensionFinder {
- public:
-  DescriptorPoolExtensionFinder(const DescriptorPool* pool,
-                                MessageFactory* factory,
-                                const Descriptor* containing_type)
-      : pool_(pool), factory_(factory), containing_type_(containing_type) {}
-  virtual ~DescriptorPoolExtensionFinder() {}
-
-  virtual bool Find(int number, ExtensionInfo* output);
-
- private:
-  const DescriptorPool* pool_;
-  MessageFactory* factory_;
-  const Descriptor* containing_type_;
-};
+// Note:  extension_set_heavy.cc defines DescriptorPoolExtensionFinder for
+// finding extensions from a DescriptorPool.
 
 // This is an internal helper class intended for use within the protocol buffer
 // library and generated classes.  Clients should not use it directly.  Instead,

src/google/protobuf/extension_set_heavy.cc

@@ -46,6 +46,25 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
+// Implementation of ExtensionFinder which finds extensions in a given
+// DescriptorPool, using the given MessageFactory to construct sub-objects.
+// This class is implemented in extension_set_heavy.cc.
+class DescriptorPoolExtensionFinder : public ExtensionFinder {
+ public:
+  DescriptorPoolExtensionFinder(const DescriptorPool* pool,
+                                MessageFactory* factory,
+                                const Descriptor* containing_type)
+      : pool_(pool), factory_(factory), containing_type_(containing_type) {}
+  virtual ~DescriptorPoolExtensionFinder() {}
+
+  virtual bool Find(int number, ExtensionInfo* output);
+
+ private:
+  const DescriptorPool* pool_;
+  MessageFactory* factory_;
+  const Descriptor* containing_type_;
+};
+
 void ExtensionSet::AppendToList(const Descriptor* containing_type,
                                 const DescriptorPool* pool,
                                 vector<const FieldDescriptor*>* output) const {

src/google/protobuf/generated_message_util.h

@@ -66,8 +66,8 @@ namespace internal {
 
 
 // Constants for special floating point values.
-double Infinity();
-double NaN();
+LIBPROTOBUF_EXPORT double Infinity();
+LIBPROTOBUF_EXPORT double NaN();
 
 
 }  // namespace internal

src/google/protobuf/repeated_field.h

@@ -300,7 +300,7 @@ class LIBPROTOBUF_EXPORT StringTypeHandlerBase {
   static void Merge(const string& from, string* to) { *to = from; }
 };
 
-class LIBPROTOBUF_EXPORT StringTypeHandler : public StringTypeHandlerBase {
+class StringTypeHandler : public StringTypeHandlerBase {
  public:
   static int SpaceUsed(const string& value)  {
     return sizeof(value) + StringSpaceUsedExcludingSelf(value);