Use CMake-generated export headers.

Config/BaseDefines.hh

 // (C) Copyright 2019 by Autodesk, Inc.
 
-#ifndef BASEDLLEXPORT
-	#if defined(WIN32) || defined(_WIN32)
-    #ifdef BASEDLL
-      #ifdef USEBASE
-        #define BASEDLLEXPORT __declspec(dllimport)
-        #define BASEDLLEXPORTONLY
-			#else
-        #define BASEDLLEXPORT __declspec(dllexport)
-        #define BASEDLLEXPORTONLY __declspec(dllexport)
-			#endif
-    #else
-      #define BASEDLLEXPORT
-      #define BASEDLLEXPORTONLY
-		#endif
-	#else // non-Windows symbols export:
-    #ifdef BASEDLL
-      // only export symbols if BASEDLL is defined (same behavior as Windows)
-      #define BASEDLLEXPORT __attribute__((visibility("default")))
-      #define BASEDLLEXPORTONLY BASEDLLEXPORT
-    #else // BASEDLL not defined
-      // this allows building Base as static library without exposing its symbols
-      #define BASEDLLEXPORT
-      #define BASEDLLEXPORTONLY
-    #endif // BASEDLL
-	#endif
-#endif
-
-#undef min
-#undef max
+#include <Base/Config/Export.hh>
+#define BASEDLLEXPORT BASE_EXPORT
 
 #if defined(_MSC_VER)