I will check the details later, and let you know. But I think the problem is not in the build itself (I'm using manually build and it is perfect from 3.5 version). The problem is in config of Debian/Ubuntu package. I installed llvm-3.6-dev package. I think it has moved cmake files from /usr/lib/llvm/share/llvm/cmake to /usr/share/llvm/cmake but some paths points to the old location.
I will check the details later, and let you know. But I think the problem is not in the build itself (I'm using manually build and it is perfect from 3.5 version). The problem is in config of Debian/Ubuntu package. I installed llvm-3.6-dev package. I think it has moved cmake files from /usr/lib/ llvm/share/ llvm/cmake to /usr/share/ llvm/cmake but some paths points to the old location.