message: travis: try to add gcc 5 and 6 to matrix
diff: @@ -6,13 +6,37 @@ matrix:
  - os: linux
  dist: trusty
  sudo: false
  - env: BUILD_TARGET=trusty_build
  compiler: gcc
  + env:
  + - BUILD_TARGET=trusty_build
  - os: linux
  dist: trusty
  sudo: false
  - env: BUILD_TARGET=trusty_build
  - compiler: gcc-5
  + compiler: gcc
  + env:
  + - BUILD_TARGET=trusty_build
  + - GCC_VERSION=5
  + addons:
  + apt:
  + sources:
  + - ubuntu-toolchain-r-test
  + packages:
  + - g++-5
  + - gcc-5
  + - os: linux
  + dist: trusty
  + sudo: false
  + compiler: gcc
  + env:
  + - BUILD_TARGET=trusty_build
  + - GCC_VERSION=6
  + addons:
  + apt:
  + sources:
  + - ubuntu-toolchain-r-test
  + packages:
  + - g++-6
  + - gcc-6
  - os: linux
  dist: trusty
  sudo: false
  @@ -29,7 +53,7 @@ addons:
  packages:
  - libcurl4-openssl-dev
  -before_script:
  +install:
  - set -e
  - if [[ "${BUILD_TARGET}" = "trusty_build" ]]; then
  mkdir -p ~/bin;
  @@ -41,6 +65,12 @@ before_script:
  $(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}" = "trusty_build" ]]; then
  