liblua visibility and compiler-flags

libs/lua/lua/liblua_visibility.h

@@ -0,0 +1,35 @@
+#ifndef __liblua_visibility_h__
+#define __liblua_visibility_h__
+
+#if defined(COMPILER_MSVC)
+#  define LIBLUA_DLL_IMPORT __declspec(dllimport)
+#  define LIBLUA_DLL_EXPORT __declspec(dllexport)
+#  define LIBLUA_DLL_LOCAL
+#else
+#  define LIBLUA_DLL_IMPORT __attribute__ ((visibility ("default")))
+#  define LIBLUA_DLL_EXPORT __attribute__ ((visibility ("default")))
+#  define LIBLUA_DLL_LOCAL  __attribute__ ((visibility ("hidden")))
+#endif
+
+
+#ifdef COMPILER_MSVC
+// MSVC: build liblua as DLL
+#  define LIBLUA_BUILD_AS_DLL
+#else
+// others currently use a static lib (incl. with libardour)
+#  define LIBLUA_STATIC
+#endif
+
+
+#ifdef LIBLUA_STATIC
+#  define LIBLUA_API
+#else
+// define when building the DLL (instead of using it)
+#  ifdef LIBLUA_DLL_EXPORTS
+#    define LIBLUA_API LIBLUA_DLL_EXPORT
+#  else
+#    define LIBLUA_API LIBLUA_DLL_IMPORT
+#  endif
+#endif
+
+#endif /* __liblua_visibility_h__ */

libs/lua/lua/luastate.h

@@ -22,9 +22,10 @@
 #include <string>
 #include <sigc++/sigc++.h>
 
+#include "lua/liblua_visibility.h"
 #include "lua/lua.h"
 
-class LuaState {
+class LIBLUA_API LuaState {
 public:
 	LuaState();
 	LuaState(lua_State *ls);