message: Try some Travis updates for Xenial (to correct the clang config failures)
diff: @@ -59,14 +59,13 @@ matrix:
  addons: &clang37
  apt:
  packages:
  - - util-linux
  - clang-3.7
  - libstdc++-5-dev
  - valgrind
  sources:
  - ubuntu-toolchain-r-test
  - - llvm-toolchain-trusty-3.7
  - - sourceline: 'deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main'
  + - llvm-toolchain-xenial-3.7
  + - sourceline: 'deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.7 main'
  key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
  - env: CLANG_VERSION=3.7 BUILD_TYPE=Release CPP=14 LIBCXX=On HEADERS=On
  @@ -113,14 +112,13 @@ matrix:
  addons: &clang5
  apt:
  packages:
  - - util-linux
  - clang-5.0
  - libstdc++-6-dev
  - valgrind
  sources:
  - ubuntu-toolchain-r-test
  - - llvm-toolchain-trusty-5.0
  - - sourceline: 'deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-5.0 main'
  + - llvm-toolchain-xenial-5.0
  + - sourceline: 'deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-5.0 main'
  key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
  - env: CLANG_VERSION=5.0 BUILD_TYPE=Release CPP=11 ASAN=On LIBCXX=On
  