Question

我的repo中有一个.travis.yml文件（每次推送到github时都会运行），如下所示：

---
language: java
sudo: true
jdk: oraclejdk8
addons:
  apt:
    sources:
      - ubuntu-toolchain-r-test
      - llvm-toolchain-precise-3.5
      - george-edison55-precise-backports # cmake 3.2.3 / doxygen 1.8.3
    packages:
      - cmake
      - cmake-data
      - gcc-4.9
      - g++-4.9
      - clang-3.5
      - valgrind
before_install:
  - sudo apt-get -qq update
  - git clone https://github.com/open-source-parsers/jsoncpp.git
  - cd jsoncpp
  - python amalgamate.py
  - mkdir build
  - cd build
  - cmake ..
  - make
script:
  - cd ../..
  - mvn install -Dlog4j.configurationFile="src/test/resources/log4j.xml"

yaml完美运行直到make语句，它会记录以下消息：

$ make
Scanning dependencies of target jsoncpp_lib_static
[ 16%] Building CXX object src/lib_json/CMakeFiles/jsoncpp_lib_static.dir/json_reader.cpp.o
[ 33%] Building CXX object src/lib_json/CMakeFiles/jsoncpp_lib_static.dir/json_value.cpp.o
/home/travis/build/fire-d/testDemo/jsoncpp/src/lib_json/json_value.cpp: In copy constructor ‘Json::Value::CZString::CZString(const Json::Value::CZString&)’:
/home/travis/build/fire-d/testDemo/jsoncpp/src/lib_json/json_value.cpp:273:78: error: conversion to ‘unsigned char:2’ from ‘unsigned int’ may alter its value [-Werror=conversion]
cc1plus: some warnings being treated as errors
make[2]: *** [src/lib_json/CMakeFiles/jsoncpp_lib_static.dir/json_value.cpp.o] Error 1
make[1]: *** [src/lib_json/CMakeFiles/jsoncpp_lib_static.dir/all] Error 2
make: *** [all] Error 2
The command "make" failed and exited with 2 during .

显然，构建失败是因为CMAKE_CXX_FLAGS已在包含文件json_value.cpp.o的文件夹中的CMakeLists.txt文件中设置了值-Werror = strict-aliasing。由于脚本总是远程运行，我无法修改这样的值。

有什么办法可以让“警告被视为错误”消息消失吗？有人有类似的问题吗？谢谢。

PD：链接到完整日志here。

Answer 1

我终于找到了解决方案：

问题是，即使安装了4.9版本的gcc和g ++编译器，容器也没有将这些作为默认值。因此，我必须强制构建将这些编译器作为默认值：

  - cd build
  - export CC=/usr/bin/gcc-4.9
  - export CXX=/usr/bin/g++-4.9
  - cmake ..

由于这些是CMakeFiles应该运行的编译器，因此构建顺利通过。

在TravisCI for github中执行时，Jsoncpp cmake抛出警告视为错误

1 个答案: