This paper presents recent developments of the LAAS architecture for autonomous systems: the GenoM3 component generator for functional components design. The GenoM tool was originally designed for autonomous and terrestrial mobile robots. This tool remains fairly general and is supported by a consistently integrated set of tools and methodologies, in order to properly design, integrate, test and validate a complex autonomous system. GenoM3 intends to grant middleware independance to robotic software components so that a clear separation of concerns is achieved between highly reusable algorithmic parts and integration frameworks. Such a decoupling let middlewares be used interchangeably, while fully benefitting from their specific, individual features.