sources:
  cfe-3.7.0.src.tar.xz: 4ff8100565528b13d99a73f807e9b426c3b3bed9
  clang-tools-extra-3.7.0.src.tar.xz: 99a8c8e04936d37b711664539a1a2271a9663825
  compiler-rt-3.7.0.src.tar.xz: b61362b409bb7909a6d11097b5f69fded061073c
  llvm-3.7.0.src.tar.xz: 0355c2fe01a8d17c3315069e6f2ef80c281e7dad
  polly-3.7.0.src.tar.xz: 16851c89d56c18442e76ad657c260bb3619a6745