.travis.yml

matrix:
    include:
        - os: linux
          language: cpp
          env:
              - MATRIX_EVAL="export CXX=g++-5"
          addons:
              apt:
                  sources:
                      - ubuntu-toolchain-r-test
                  packages:
                      - g++-5
        - os: linux
          language: cpp
          env:
              - MATRIX_EVAL="export CXX=clang++-4.0"
          addons:
              apt:
                  sources:
                      - llvm-toolchain-trusty-4.0
                      - ubuntu-toolchain-r-test
                  packages:
                      - clang-4.0
                      - g++-5
        - os: osx
          language: cpp

before_install:
  - test -n $CXX && unset CXX
  - eval "${MATRIX_EVAL}"
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then pip install --user flask==1.0 gunicorn httpbin; fi
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew upgrade python; fi
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then pip3 install --user flask==1.0 gunicorn httpbin; fi

script:
    - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then ~/.local/bin/gunicorn httpbin:app; fi &
    - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then ~/Library/Python/3.7/bin/gunicorn httpbin:app; fi &
    - mkdir build && cd build
    - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then cmake .. -DCMAKE_CXX_COMPILER=$CXX; fi
    - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then cmake ..; fi
    - make -j2
    - ./http_client http://127.0.0.1:8000/get