message: Add clang-8 to use with travis-CI
diff: @@ -127,6 +127,22 @@ matrix:
  - libglu1-mesa-dev
  compiler: clang++-7
  + - os: linux
  + before_install:
  + - sudo apt-get update
  + - sudo apt-get purge g++
  + - sudo apt-get install clang-8
  + - CC=clang-8 && CXX=clang++-8
  + addons:
  + apt:
  + sources:
  + - ubuntu-toolchain-r-test
  + packages:
  + - ninja-build
  + - xorg-dev
  + - libglu1-mesa-dev
  + compiler: clang++-8
  +
  before_install:
  - eval "${MATRIX_EVAL}"
  