CMake Tutorial1_3 设置语言标准

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最新推荐文章于 2025-01-15 23:06:32 发布

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分类专栏： # CMake 文章标签： CMake 设置语言标准

本文链接：https://blog.youkuaiyun.com/luoshabugui/article/details/117353787

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本文介绍了如何在CMake中设置C++语言标准，以C++11为例展示了CMakeLists.txt的配置，并通过修改为C++98标准引发的错误来说明不同标准的兼容性问题。在构建过程中，详细列出了编译和链接的步骤，最后提到了代码已上传至Github供参考。

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                    一 内容 
在 CMake Tutorial1_1 最简单的例子 基础上修改。
主要说明 CMake如何设置C++语言标准。
修改CMakeLists.txt# 设置CMake最低版本
cmake_minimum_required(VERSION 3.16)

# 设置项目名称及版本
project(Tutorial VERSION 1.0)

# 设置语言标准,此处为C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

# 生成可执行文件
add_executable(Tutorial main.cc)
 
 
从 CXX_STANDARD 可知，当前CMAKE_CXX_STANDARD可设置的值有98，11，14，17，20，23。
 
修改 main.ccint main() {
  auto f = [](){
   std::cout << "C++11, auto & lambda express feature." << std::endl;
  };
  f();
  return 0;
}
 
 
二 构建 
与Tutorial1_1相同，创建并进入构建目录build
build&runlee@leedeMacBook-Pro build % cmake ..
-- The C compiler identification is AppleClang 12.0.0.12000032
-- The CXX compiler identification is AppleClang 12.0.0.12000032
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/lee/research/cmake_learn/cmake_tutorial/step1_3/build
lee@leedeMacBook-Pro build % cmake --build .
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/lee/research/cmake_learn/cmake_tutorial/step1_3/build
Scanning dependencies of target Tutorial
[ 50%] Building CXX object CMakeFiles/Tutorial.dir/main.cc.o
[100%] Linking CXX executable Tutorial
[100%] Built target Tutorial
lee@leedeMacBook-Pro build % ./Tutorial 
C++11, auto & lambda express feature.
 
如果将标准设置为C++98呢？有如下报错：lee@leedeMacBook-Pro build % cmake --build .
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/lee/research/cmake_learn/cmake_tutorial/step1_3/build
[ 50%] Building CXX object CMakeFiles/Tutorial.dir/main.cc.o
/Users/lee/research/cmake_learn/cmake_tutorial/step1_3/main.cc:4:3: warning: 
      'auto' type specifier is a C++11 extension [-Wc++11-extensions]
  auto f = [](){
  ^
/Users/lee/research/cmake_learn/cmake_tutorial/step1_3/main.cc:4:12: error: 
      expected expression
  auto f = [](){
           ^
1 warning and 1 error generated.
make[2]: *** [CMakeFiles/Tutorial.dir/main.cc.o] Error 1
make[1]: *** [CMakeFiles/Tutorial.dir/all] Error 2
make: *** [all] Error 2
 
 
三 Github 
代码已上传Github
 
四 参考 
CXX_STANDARD
Tutorial

                