os: linux # Use linux unless specified otherwise.
dist: xenial
sudo: required

language: cpp

git:
  depth: 1

matrix:
  include:
    - os: linux
      compiler: g++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-7
      env:
        - CXX_COMPILER=g++-7 CC_COMPILER=gcc-7

    - os: linux
      compiler: g++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-8
      env:
        - CXX_COMPILER=g++-8 CC_COMPILER=gcc-8

    - os: linux
      compiler: g++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-9
      env:
        - CXX_COMPILER=g++-9 CC_COMPILER=gcc-9

    - os: linux
      compiler: clang++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-xenial-5.0
          packages:
            - clang-5.0
      env:
        - CXX_COMPILER=clang++-5.0 CC_COMPILER=clang-5.0

    - os: linux
      compiler: clang++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-xenial-6.0
          packages:
            - clang-6.0
      env:
        - CXX_COMPILER=clang++-6.0 CC_COMPILER=clang-6.0

    - os: linux
      compiler: clang++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-xenial-7
          packages:
            - clang-7
      env:
        - CXX_COMPILER=clang++-7 CC_COMPILER=clang-7

    - os: linux
      compiler: clang++
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-xenial-8
          packages:
            - clang-8
      env:
        - CXX_COMPILER=clang++-8 CC_COMPILER=clang-8

    - os: osx
      compiler: clang++
      osx_image: xcode9.4
      env:
        - CXX_COMPILER=clang++ CC_COMPILER=clang

    - os: osx
      compiler: clang++
      osx_image: xcode10.2
      env:
        - CXX_COMPILER=clang++ CC_COMPILER=clang

install:
  - export CC=${CC_COMPILER}
  - export CXX=${CXX_COMPILER}
  - JOBS=2 # Travis machines have 2 cores.
  - |
    # getting Catch2 library
    git clone https://github.com/catchorg/Catch2.git
    cd Catch2
    git checkout v2.9.1
    mkdir build
    cd build
    pwd
    cmake -DCATCH_BUILD_TESTING=OFF -DCATCH_INSTALL_DOCS=OFF -DCATCH_INSTALL_HELPERS=OFF -DCMAKE_INSTALL_PREFIX=../installed ..
    cmake --build . --target install --config Release
    cd ../..

    # If linux and clang install the right version of libc++.
    if [[ "${TRAVIS_OS_NAME}" == "linux" && "${CXX%%+*}" == "clang" && -n "$(ls -A ${LLVM_INSTALL})" ]]; then
      LLVM_INSTALL=${DEPS_DIR}/llvm/install
      if   [[ "${CXX}" == "clang++-3.5" ]]; then LLVM_VERSION="3.5.2";
      elif [[ "${CXX}" == "clang++-3.6" ]]; then LLVM_VERSION="3.6.2";
      elif [[ "${CXX}" == "clang++-3.7" ]]; then LLVM_VERSION="3.7.1";
      elif [[ "${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 [[ "${CXX}" == "clang++-5.0" ]]; then LLVM_VERSION="5.0.2";
      elif [[ "${CXX}" == "clang++-6.0" ]]; then LLVM_VERSION="6.0.1";
      elif [[ "${CXX}" == "clang++-7" ]]; then LLVM_VERSION="7.0.1";
      elif [[ "${CXX}" == "clang++-8" ]]; then LLVM_VERSION="8.0.0";
      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
      travis_retry wget -O - ${LIBCXX_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxx
      travis_retry wget -O - ${LIBCXXABI_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxxabi
      (cd llvm/build && cmake .. -DCMAKE_INSTALL_PREFIX=${LLVM_INSTALL})
      (cd llvm/build/projects/libcxx && sudo make install -j${JOBS})
      (cd llvm/build/projects/libcxxabi && sudo make install -j${JOBS})
      export CXXFLAGS="-isystem ${LLVM_INSTALL}/include/c++/v1"
      export LDFLAGS="-L ${LLVM_INSTALL}/lib -l c++ -l c++abi"
      export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${LLVM_INSTALL}/lib"
    fi

before_script:
  - rm -rf build
  - mkdir -p build
  - cd build
  - pwd
  - cmake -G "Unix Makefiles" -DCMAKE_PREFIX_PATH=../Catch2/installed ..

script:
  - cmake --build . -- -j${JOBS}
  - ctest --output-on-failure -j${JOBS}

notifications:
  email: false