.travis.yml

# Source: https://github.com/boostorg/hana/blob/master/.travis.yml

# Use C++ build environment
language: cpp

# Protobuf requires g++ (see https://github.com/google/protobuf/blob/master/src/README.md)
compiler:
    - gcc

# Cache dependencies to speed up the build.
cache:
    directories:
        - ${TRAVIS_BUILD_DIR}/deps/cmake
        - ${TRAVIS_BUILD_DIR}/deps/protobuf

# Handle dependencies in separate directory
before_install:
    - DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
    - mkdir -p "${DEPS_DIR}"
    - cd "${DEPS_DIR}"

install:
    # Install a recent version of CMake
    - |
        CMAKE_URL="https://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz"
        if [ ! -f ${DEPS_DIR}/cmake/bin/cmake ] ; then mkdir -p cmake ; travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C cmake ; fi
        export PATH=${DEPS_DIR}/cmake/bin:${PATH}

    # Install a recent version of the Protobuf
    - |
        PROTOBUF_URL="https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz"
        if [ ! -f ${DEPS_DIR}/protobuf/install/bin/protoc ] ; then mkdir -p protobuf ; travis_retry wget --no-check-certificate --quiet -O - ${PROTOBUF_URL} | tar --strip-components=1 -xz -C protobuf ; cd protobuf ; ./configure --prefix=${DEPS_DIR}/protobuf/install ; make ; make install ; fi
        export PATH=${DEPS_DIR}/protobuf/install/bin:${PATH}

# Change directory back to default build directory
before_script:
    - cd "${TRAVIS_BUILD_DIR}/examples"

# Run the build script
script:
    - mkdir -p build
    - cd build
    - cmake -D CMAKE_PREFIX_PATH:PATH=${DEPS_DIR}/protobuf/install ..
    - cmake --build .