.travis.yml

language: cpp
script: make
matrix:
  include:
    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-4.9
      env:
         - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"

    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-8
      env:
        - MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"

    # works on Trusty
    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-4.0
          packages:
            - clang-4.0
      env:
        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"

    # windows mingw32
    - os: windows
      install: choco install mingw
      script: mingw32-make

    # osx
    - os: osx
      osx_image: xcode10.1

    - os: osx
      osx_image: xcode9.4

before_install:
    - eval "${MATRIX_EVAL}"