如何通过CMake编译一个示例C项目（demo）进行实例分享？

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下面是一个简化版的CMake示例，用于编译一个C++项目并生成可执行文件：

通过一个例子来说明如何使用CMake编译一个C++项目，生成可执行文件：

整理目录结构：- CMakeLists.txt- addlib- build - main.cpp

由于电脑上没有tree命令，也无法截屏，就简单看看：

在CMakeLists.txt中添加以下内容：cmake_minimum_required(VERSION 3.0)project(MyProject)

add_executable(MyProject main.cpp)

build是CMake编译的步骤，其中包含以下命令：cmake -B build -S . -DCMAKE_BUILD_TYPE=Release

下面通过一个小例子来说明cmake编译一个c++项目，生成可执行文件：

整理目录结构：

CMake Lists.txt addlib build main.cpp

电脑上没有tree命令，也不大敢截图，将就着看看，其中build是cmake编译指定的路径，addlib下面也有一个头文件和源文件 ，还有一个CmakeLists.txt,可以看下：

CMake Lists.txt library.cpp library.h

先看各个文件的代码：

addlib/library.h:

#ifndef CPPPROJECT_LIBRARY_H #define CPPPROJECT_LIBRARY_H int acc_add(int); #endif

addlib/library.cpp:

#include "library.h" #include <iostream> void hello(){ std::cout<<"hello world"<<std::endl; } int acc_add(int n){ int sum=0; for(int i=0;i<n;i++){ sum+=i; } return sum; }

addlib/CMakeLists.txt:

cmake_minimum_required(VERSION 3.10) project(accliblibrary) set(CMAKE_CXX_STANDARD 11) add_library(accliblibrary SHARED library.cpp library.h) # 诉生成一个库文件。

main.cpp:

#include <iostream> #include <string> #include "addlib/library.h" using namespace std; int main(){ int n=10; int ans=acc_add(n); cout<<"1+....+"<<n<<"="<<ans<<endl; return 0; }

CMakeLists.txt:

cmake_minimum_required(VERSION 3.10) project(cppproject) set(CMAKE_CXX_STANDARD 11) add_subdirectory(acclib) add_executable(cppproject main.cpp) #生成一个可执行的文件 target_link_libraries(cppproject accliblibrary)

下面就是编译该项目，生成可执行文件：

cd build/

cmake ..

-- The C compiler identification is AppleClang 8.0.0.8000042
-- The CXX compiler identification is AppleClang 8.0.0.8000042
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/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: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/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/zhoumeixu/Documents/cmakedemo/build

make:

Scanning dependencies of target addliblibrary
[ 25%] Building CXX object addlib/CMakeFiles/addliblibrary.dir/library.cpp.o
[ 50%] Linking CXX shared library libaddliblibrary.dylib
[ 50%] Built target addliblibrary
Scanning dependencies of target cmakedemo
[ 75%] Building CXX object CMakeFiles/cmakedemo.dir/main.cpp.o
[100%] Linking CXX executable cmakedemo
[100%] Built target cmakedemo

./cmakedemo

1+....+10=45

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