message: travis: set env CC, CXX vars earlier and correct
diff: @@ -15,7 +15,8 @@ matrix:
  compiler: gcc
  env:
  - BUILD_TARGET=gcc_build
  - - GCC_VERSION=5
  + - CC=gcc-5
  + - CXX=g++-5
  addons:
  apt:
  sources:
  @@ -29,7 +30,8 @@ matrix:
  compiler: gcc
  env:
  - BUILD_TARGET=gcc_build
  - - GCC_VERSION=6
  + - CC=gcc-6
  + - CXX=g++-6
  addons:
  apt:
  sources:
  @@ -40,7 +42,10 @@ matrix:
  - os: linux
  dist: trusty
  sudo: false
  - env: BUILD_TARGET=clang_build
  + env:
  + - BUILD_TARGET=clang_build
  + - CC=clang-3.8
  + - CXX=clang++-3.8
  compiler: clang
  addons:
  apt:
  @@ -57,7 +62,8 @@ matrix:
  env: BUILD_TARGET=docker_build
  - os: osx
  osx_image: xcode8
  - env: BUILD_TARGET=clang_build
  + env:
  + - BUILD_TARGET=clang_build
  addons:
  apt:
  @@ -76,12 +82,6 @@ install:
  $(aws ecr get-login --region eu-central-1);
  docker pull ${DOCKER_REPO};
  fi
  -- if [[ $GCC_VERSION -eq 5 ]]; then
  - export CXX=g++-5 CC=gcc-5;
  - fi
  -- if [[ $GCC_VERSION -eq 6 ]]; then
  - export CXX=g++-6 CC=gcc-6;
  - fi
  script:
  - if [[ "${BUILD_TARGET}" = "gcc_build" ]]; then
  