hxcpp

% cat Main.hx
interface TestInterface {
        function fubar(s: String) : Void;
}

class Test implements TestInterface {
        public function new() {}
        public function fubar(s: String) {
                trace(s);
        }
}

class Main {
        static function main() {
                var test = new Test();
                test.fubar("Interface");
        }
}

% haxe
Haxe Compiler 3.0.0 - (C)2005-2013 Haxe Foundation

% haxelib list
...
hxcpp: [3.0.0]
...

% haxe -main Main -cpp out
haxelib run hxcpp Build.xml haxe -Dhaxe3="1" -Dhaxe_ver="3."
<compiling>

% ./out/Main
Main.hx:8: Interface