configure build for cpp target as a library

build.hxml

@@ -0,0 +1,21 @@
+-cp src
+
+# exposed classes
+io.colyseus.Client
+io.colyseus.Room
+
+-lib hxcpp
+-lib haxe-ws
+
+# this is for Mac OS X:
+-D HXCPP_M64
+
+# this is required on Windows. the "d" stands for debug:
+# -D ABI=-MTd
+
+-dce full
+-cpp build/cpp
+
+-D static_link
+# -D dll_export # WINDOWS?
+-D actuate

src/io/colyseus/Client.hx

@@ -10,6 +10,7 @@ interface RoomAvailable {
     public var metadata: Dynamic;
 }
 
+@:keep
 class Client {
     public var id: String = "";
     public var endpoint: String;