diff --git a/include/vsg/core/Array.h b/include/vsg/core/Array.h
index ebc3209a1..54cf11367 100644
--- a/include/vsg/core/Array.h
+++ b/include/vsg/core/Array.h
@@ -33,7 +33,7 @@ namespace vsg
 {
 
     template<typename T>
-    class Array : public Data
+    class VSG_DECLSPEC Array : public Data
     {
     public:
         using value_type = T;
@@ -101,7 +101,7 @@ namespace vsg
             _data(nullptr),
             _size(0)
         {
-            assign(data, offset, stride, l.size());
+            assign(data, offset, stride, static_cast<uint32_t>(l.size()));
 
             iterator itr = begin();
             for (const value_type& v : l) { (*itr++) = v; }
diff --git a/include/vsg/core/Export.h b/include/vsg/core/Export.h
index 3e46bcc17..c5b5941f9 100644
--- a/include/vsg/core/Export.h
+++ b/include/vsg/core/Export.h
@@ -25,5 +25,9 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #        define VSG_DECLSPEC
 #    endif
 #else
-#    define VSG_DECLSPEC
+#    if defined(VSG_SHARED_LIBRARY) || defined(VSG_EXPORTS)
+#        define VSG_DECLSPEC __attribute__((visibility("default")))
+#    else
+#        define VSG_DECLSPEC
+#    endif
 #endif
diff --git a/include/vsg/core/Object.h b/include/vsg/core/Object.h
index fce17f532..1bbc1280e 100644
--- a/include/vsg/core/Object.h
+++ b/include/vsg/core/Object.h
@@ -22,6 +22,12 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #include <vsg/core/ref_ptr.h>
 #include <vsg/core/type_name.h>
 
+#ifdef VSG_USE_DYNAMIC_CAST
+    #define VSG_CAST_DYNAMIC
+#else
+    #undef VSG_CAST_DYNAMIC
+#endif
+
 namespace vsg
 {
 
@@ -85,11 +91,19 @@ namespace vsg
         virtual const std::type_info& type_info() const noexcept { return typeid(Object); }
         virtual bool is_compatible(const std::type_info& type) const noexcept { return typeid(Object) == type; }
 
-        template<class T>
-        T* cast() { return is_compatible(typeid(T)) ? static_cast<T*>(this) : nullptr; }
+        #ifdef VSG_CAST_DYNAMIC  
+            template<class T>
+            T* cast() { return dynamic_cast<T*>(this); }
 
-        template<class T>
-        const T* cast() const { return is_compatible(typeid(T)) ? static_cast<const T*>(this) : nullptr; }
+            template<class T>
+            const T* cast() const { return dynamic_cast<const T*>(this); }
+        #else
+            template<class T>
+            T* cast() { return is_compatible(typeid(T)) ? static_cast<T*>(this) : nullptr; }
+
+            template<class T>
+            const T* cast() const { return is_compatible(typeid(T)) ? static_cast<const T*>(this) : nullptr; }
+        #endif
 
         /// clone this object using CopyOp's duplicates map to decide whether to clone or to return the original object.
         /// The default clone(CopyOp&) implementation simply returns ref_ptr<> to this object rather attempt to clone.
diff --git a/src/vsg/CMakeLists.txt b/src/vsg/CMakeLists.txt
index 26e87199a..1a8fa27ff 100644
--- a/src/vsg/CMakeLists.txt
+++ b/src/vsg/CMakeLists.txt
@@ -426,6 +426,14 @@ target_link_libraries(vsg ${LIBRARIES})
 
 if (BUILD_SHARED_LIBS)
     target_compile_definitions(vsg INTERFACE VSG_SHARED_LIBRARY)
+else()
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+        if (VSG_USE_DYNAMIC_CAST)
+            target_compile_definitions(vsg PRIVATE VSG_USE_DYNAMIC_CAST)
+        else ()
+            target_compile_definitions(vsg PRIVATE VSG_EXPORTS)
+        endif ()
+    endif()
 endif()
 
 # install headers