One more warning to disable [kde-next] should anyone still have it enabled.
The toolchain will move to GCC 5, this means a full rebuild of all in core, plus another 600 in main and apps (including a complete rebuild of all Qt & KDE)
Once core is rebuild, kde-next will start to be in use for further rebuilds. DO NOT use kde-next until further notice here. It can only be back in use once the above mentioned rebuilds are done.