.travis.yml

matrix:
  include:
    #C with clang
    - os: linux
      language: c
      script:
        make c
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-5.0
          packages:
            - clang-5.0
      env:
        - MATRIX_EVAL="CC=clang-5.0"
    
    #C with gcc
    - os: linux
      language: c
      script:
        make c
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - gcc-7
      env:
        - MATRIX_EVAL="CC=gcc-7"
        
    #C++ with gcc
    - os: linux
      language: cpp
      script:
        make cpp
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-7
      env:
        - MATRIX_EVAL="CXX=g++-7"
        
    #C++ with clang
    - os: linux
      language: cpp
      script:
        make cpp
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-5.0
          packages:
            - clang-5.0
      env:
        - MATRIX_EVAL="CXX=clang++-5.0"
        
before_install:
    - eval "${MATRIX_EVAL}"