Extensible SDK update mechanism needs to be tested, For do it, - Generate an sdk ext. - Install sdk ext. - Update build system (adding a recipe). - Generate again sdk ext. - Execute sdk-update.
At, http://lists.openembedded.org/pipermail/openembedded-core/2016-February/117853.html
Merged at, http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=c7e5a38d232b97da81eb87aa1ef520c65c4692b4