deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main 
deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-4.0 main
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-4.0 main