在 travis 上为 clang 使用不同的 libc++ 版本

Question

Travis 使用 Ubuntu Trusty，默认的 libc++ 版本是 svn199600.

但是我想用不同的（更新的）版本进行测试，就像我已经用不同的 clang 版本做的那样。

我目前的 .travis.yml 看起来如下：

language: generic

dist: trusty
sudo: required

matrix:
    include:
    - env: CXX=g++-7 CC=gcc-7
      addons:
        apt:
          packages:
            - g++-7
          sources: &sources
            - ubuntu-toolchain-r-test
            - llvm-toolchain-precise
            - llvm-toolchain-precise-3.9
            - llvm-toolchain-precise-3.8
            - llvm-toolchain-precise-3.7
            - llvm-toolchain-precise-3.6
            - sourceline: 'deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-4.0 main'
              key_url: 'http://apt.llvm.org/llvm-snapshot.gpg.key'
    - env: CXX=g++-6 CC=gcc-6
      addons:
        apt:
          packages:
            - g++-6
          sources: *sources
    - env: CXX=g++-5 CC=gcc-5
      addons:
        apt:
          packages:
            - g++-5
          sources: *sources
    - env: CXX=g++-4.9 CC=gcc-4.9
      addons:
        apt:
          packages:
            - g++-4.9
          sources: *sources
    - env: CXX=clang++-4.0 CC=clang-4.0
      addons:
        apt:
          packages:
            - clang-4.0
            - libc++-dev
          sources: *sources
    - env: CXX=clang++-3.9 CC=clang-3.9
      addons:
        apt:
          packages:
            - clang-3.9
            - libc++-dev
          sources: *sources
    - env: CXX=clang++-3.8 CC=clang-3.8
      addons:
        apt:
          packages:
            - clang-3.8
            - libc++-dev
          sources: *sources
    - env: CXX=clang++-3.7 CC=clang-3.7
      addons:
        apt:
          packages:
            - clang-3.7
            - libc++-dev
          sources: *sources
    - env: CXX=clang++-3.6 CC=clang-3.6
      addons:
        apt:
          packages:
            - clang-3.6
            - libc++-dev
          sources: *sources

script:
    - ./build_and_test.sh

before_install:
    - ./before_install.sh

例如用 libc++-dev-3.9 替换 libc++-dev 没有帮助（仍然使用旧的库版本），即使添加以下行：

- sourceline: 'deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main'

我还尝试将以下内容添加到我的 before_install.sh 但没有成功（仍然是旧库）：

sudo apt-add-repository "deb http://llvm.org/apt/trusty/ llvm-toolchain-trusty-3.9 main"   
sudo apt-get update   
sudo apt-get install -y libc++-dev libc++-helpers libc++1 libc++abi-dev lldb-3.9

如何在不从源代码构建的情况下正确完成？

Answer 1

看起来如果不从源代码构建是不可能做到的。 range-v3 library uses a script 正是这样做的。

我调整了我的 travis.yml 来使用它：

language: generic

dist: trusty
sudo: required

matrix:
    include:
    - os: linux
      compiler: gcc
      env: GCC_VERSION=7
        - CC=gcc-7
        - CXX=g++-7
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test']
          packages: ['g++-7']

    - os: linux
      compiler: gcc
      env: GCC_VERSION=6
        - CC=gcc-6
        - CXX=g++-6
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test']
          packages: ['g++-6']

    - os: linux
      compiler: gcc
      env: GCC_VERSION=5
        - CC=gcc-5
        - CXX=g++-5
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test']
          packages: ['g++-5']

    - os: linux
      compiler: clang
      env: CLANG_VERSION=5.0 LIBCXX=On
        - CC=clang-5.0
        - CXX=clang++-5.0
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
          packages: ['clang-5.0', 'g++-6']

    - os: linux
      compiler: clang
      env: CLANG_VERSION=4.0 LIBCXX=On
        - CC=clang-4.0
        - CXX=clang++-4.0
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-4.0']
          packages: ['clang-4.0', 'g++-6']

    - os: linux
      compiler: clang
      env: CLANG_VERSION=3.9 LIBCXX=On
        - CC=clang-3.9
        - CXX=clang++-3.9
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.9']
          packages: ['clang-3.9', 'g++-6']

    - os: linux
      compiler: clang
      env: CLANG_VERSION=3.8 LIBCXX=On
        - CC=clang-3.8
        - CXX=clang++-3.8
      addons:
        apt:
          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.8']
          packages: ['clang-3.8', 'g++-6']

before_install:
  - wget https://raw.githubusercontent.com/onqtam/doctest/master/doctest/doctest.h
  - sudo mv ./doctest.h /usr/local/include/doctest.h
  - |
    if [ -n "$GCC_VERSION" ]; then
      export CXX="g++-${GCC_VERSION}" CC="gcc-${GCC_VERSION}"
    fi
    if [ -n "$CLANG_VERSION" ]; then
      export CXX="clang++-${CLANG_VERSION}" CC="clang-${CLANG_VERSION}"
    fi
    if [ "$LIBCXX" == "On" ]; then
      sudo apt-get purge cmake
      sudo apt-get install cmake3
      cmake --version
      sudo CXX="$CXX" CC="$CC"
      sudo ./cmake/install_libcxx.sh
      export CXXFLAGS="-stdlib=libc++"
    fi

install:
  - mkdir -p build && cd build
  - cmake .. -DUNITTEST=ON

script:
  - which $CXX
  - $CXX --version
  - cmake --build . --target unittest --config Release -- -j4

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