使用庫存 CMake 配置 Travis CI

Travis CI 預裝了 CMake 2.8.7。

用於源外構建的最小 .travis.yml 指令碼

language: cpp

compiler:
  - gcc

before_script:
  # create a build folder for the out-of-source build
  - mkdir build
  # switch to build directory
  - cd build
  # run cmake; here we assume that the project's
  # top-level CMakeLists.txt is located at '..'
  - cmake ..

script:
  # once CMake has done its job we just build using make as usual
  - make
  # if the project uses ctest we can run the tests like this
  - make test