add export control to control protocol library

libs/surfaces/control_protocol/control_protocol/basic_ui.h

@@ -32,12 +32,14 @@
 
 #include "timecode/time.h"
 
+#include "control_protocol/visibility.h"
+
 namespace ARDOUR {
 	class Session;
 	class SessionEvent;
 }
 
-class BasicUI {
+class LIBCONTROLCP_API BasicUI {
   public:
 	BasicUI (ARDOUR::Session&);
 	virtual ~BasicUI ();

libs/surfaces/control_protocol/control_protocol/control_protocol.h

@@ -30,6 +30,7 @@
 #include "pbd/stateful.h"
 #include "pbd/signals.h"
 
+#include "control_protocol/visibility.h"
 #include "control_protocol/basic_ui.h"
 #include "control_protocol/types.h"
 
@@ -39,7 +40,7 @@ class Route;
 class Session;
 class Bundle;
 
-class ControlProtocol : public PBD::Stateful, public PBD::ScopedConnectionList, public BasicUI
+class LIBCONTROLCP_API ControlProtocol : public PBD::Stateful, public PBD::ScopedConnectionList, public BasicUI
 {
   public:
 	ControlProtocol (Session&, std::string name);

libs/surfaces/control_protocol/control_protocol/visibility.h

@@ -0,0 +1,56 @@
+/*
+    Copyright (C) 2013 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __libcontrolcp_visibility_h__
+#define __libcontrolcp_visibility_h__
+
+/* _WIN32 is defined by most compilers targetting Windows, but within the
+ * controlcp source tree, we also define COMPILER_MSVC or COMPILER_MINGW depending
+ * on how a Windows build is built.
+ */
+
+#if defined _WIN32 || defined __CYGWIN__ || defined(COMPILER_MSVC) || defined(COMPILER_MINGW)
+  #define LIBCONTROLCP_DLL_IMPORT __declspec(dllimport)
+  #define LIBCONTROLCP_DLL_EXPORT __declspec(dllexport)
+  #define LIBCONTROLCP_DLL_LOCAL
+#else
+  #if __GNUC__ >= 4
+    #define LIBCONTROLCP_DLL_IMPORT __attribute__ ((visibility ("default")))
+    #define LIBCONTROLCP_DLL_EXPORT __attribute__ ((visibility ("default")))
+    #define LIBCONTROLCP_DLL_LOCAL  __attribute__ ((visibility ("hidden")))
+  #else
+    #define LIBCONTROLCP_DLL_IMPORT
+    #define LIBCONTROLCP_DLL_EXPORT
+    #define LIBCONTROLCP_DLL_LOCAL
+  #endif
+#endif
+
+#ifdef LIBCONTROLCP_DLL // libcontrolcp is a DLL
+#ifdef LIBCONTROLCP_DLL_EXPORTS // defined if we are building the libcontrolcp DLL (instead of using it)
+    #define LIBCONTROLCP_API LIBCONTROLCP_DLL_EXPORT
+#else
+    #define LIBCONTROLCP_API LIBCONTROLCP_DLL_IMPORT
+#endif 
+#define     LIBCONTROLCP_LOCAL LIBCONTROLCP_DLL_LOCAL
+#else /* static lib, not DLL */
+#define LIBCONTROLCP_API
+#define LIBCONTROLCP_LOCAL
+#endif
+
+#endif /* __libcontrolcp_visibility_h__ */