.travis.yml

language: cpp
os: linux # default
dist: trusty # default
sudo: false

matrix:
  include:
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-6
      env:
        - MATRIX_EVAL="CCCOMPILER=gcc-6 && CXXCOMPILER=g++-6"

    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-7
      env:
        - MATRIX_EVAL="CCCOMPILER=gcc-7 && CXXCOMPILER=g++-7"

    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-8
      env:
        - MATRIX_EVAL="CCCOMPILER=gcc-8 && CXXCOMPILER=g++-8"

    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-3.9
          packages:
            - clang-3.9
      env:
        - MATRIX_EVAL="CCCOMPILER=clang-3.9 && CXXCOMPILER=clang++-3.9"

    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-4.0
          packages:
            - clang-4.0
      env:
        - MATRIX_EVAL="CCCOMPILER=clang-4.0 && CXXCOMPILER=clang++-4.0"

    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-5.0
          packages:
            - clang-5.0
      env:
        - MATRIX_EVAL="CCCOMPILER=clang-5.0 && CXXCOMPILER=clang++-5.0"
        
    - os: osx
      osx_image: xcode9.4
      env:
        - MATRIX_EVAL="CCCOMPILER=clang && CXXCOMPILER=clang++"

    - os: osx
      osx_image: xcode10
      env:
        - MATRIX_EVAL="CCCOMPILER=clang && CXXCOMPILER=clang++"

before_install:
    - eval "${MATRIX_EVAL}"

install:
  - export CXX=${CXXCOMPILER}
  - export CC=${CCCOMPILER}
  ############################################################################
  # Preparation
  ############################################################################
  - DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
  - mkdir ${DEPS_DIR} && cd ${DEPS_DIR}
  - |
    if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
      if [[ "${CCCOMPILER}" == "gcc-8" ]]; then
        brew install gcc
        brew link --overwrite gcc
      fi
    fi
  ############################################################################
  # Update CMake
  ############################################################################
  - |
    if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
      export CMAKE_VER="3.13.2"
      travis_retry wget --no-check-certificate https://github.com/Kitware/CMake/releases/download/v${CMAKE_VER}/cmake-${CMAKE_VER}-Linux-x86_64.tar.gz
      tar -xvf cmake-${CMAKE_VER}-Linux-x86_64.tar.gz > /dev/null
      PATH=${DEPS_DIR}/cmake-${CMAKE_VER}-Linux-x86_64:${DEPS_DIR}/cmake-${CMAKE_VER}-Linux-x86_64/bin:$PATH
      cd ${TRAVIS_BUILD_DIR}
      cmake --version
    fi
  ############################################################################
  # Clang specific setup (inspired by boost::hana!)
  ############################################################################
  - |
    if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
      if [[ "${CXX%%+*}" == "clang" ]]; then
        if [[ "${CXX}" == "clang++-3.8" ]]; then LLVM_VERSION="3.8.1";
        elif [[ "${CXX}" == "clang++-3.9" ]]; then LLVM_VERSION="3.9.1";
        elif [[ "${CXX}" == "clang++-4.0" ]]; then LLVM_VERSION="4.0.1";
        elif [[ "${CXX}" == "clang++-5.0" ]]; then LLVM_VERSION="5.0.1";
        fi
        LLVM_URL="http://llvm.org/releases/${LLVM_VERSION}/llvm-${LLVM_VERSION}.src.tar.xz"
        LIBCXX_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxx-${LLVM_VERSION}.src.tar.xz"
        LIBCXXABI_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxxabi-${LLVM_VERSION}.src.tar.xz"
        mkdir -p llvm llvm/build llvm/projects/libcxx llvm/projects/libcxxabi
        travis_retry wget -O - ${LLVM_URL} | tar --strip-components=1 -xJ -C llvm || exit 1
        travis_retry wget -O - ${LIBCXX_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxx || exit 1
        travis_retry wget -O - ${LIBCXXABI_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxxabi || exit 1
        (cd llvm/build && cmake .. -DCMAKE_INSTALL_PREFIX=${DEPS_DIR}/llvm/install) || exit 1
        (cd llvm/build/projects/libcxx && make install -j2) || exit 1
        (cd llvm/build/projects/libcxxabi && make install -j2) || exit 1
        export CXXFLAGS="-isystem ${DEPS_DIR}/llvm/install/include/c++/v1"
        export LDFLAGS="-L ${DEPS_DIR}/llvm/install/lib -l c++ -l c++abi"
        export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${DEPS_DIR}/llvm/install/lib"
      fi
    fi
  ############################################################################
  # Compile GTest
  ############################################################################
  - cd ${DEPS_DIR}
  - git clone https://github.com/google/googletest.git
  - cd googletest && mkdir build && cd build
  - cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${DEPS_DIR}/googletest/install ..
  - make -j4 && make install

before_script:
  - cd ${TRAVIS_BUILD_DIR}
  - export GTEST_ROOT=${DEPS_DIR}/googletest/install

script:
  - cd ${TRAVIS_BUILD_DIR}/src && mkdir build && cd build
  - cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=~/.local/ ..
  - cmake --build . --target install
  - cd ${TRAVIS_BUILD_DIR}/test && mkdir build && cd build
  - cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=~/.local/ ..
  - make
  - ctest -VV

# after_success:
#   - bash <(curl -s https://codecov.io/bash)