version: 2
jobs:
  build:
    docker:
      - image: circleci/buildpack-deps:16.04-curl-browsers
    environment:
      - PATH: "/home/ubuntu/cmake-3.11.0-Linux-x86_64/bin:$PATH"
      - CXX: g++-7.1
    steps:
      - checkout
      - save_cache:
          key: dependency-cache
          path: ~/cmake-3.11.0-Linux-x86_64
      - run: sudo add-apt-repository -y ppa:jonathonf/gcc-7.1
      - run: sudo apt-get update
      - run: sudo apt-get install gcc-7 g++-7
      - run:
          name: Build project
          command: |
            if [ ! -d ~/cmake-3.11.0-Linux-x86_64 ]; then
              echo "No cache - building CMake"
              cd ~ && wget --quiet https://cmake.org/files/v3.11/cmake-3.11.0-Linux-x86_64.tar.gz && tar -xvf cmake-3.11.0-Linux-x86_64.tar.gz
            else
              echo "Cached CMake found"
              ls -Ahl ~/cmake-3.11.0-Linux-x86_64
            fi
            cd build && cmake -DCMAKE_BUILD_TYPE=Debug .. && make -j