如何使用cmake去编译c++项目

前提准备：是手动安装好了gcc编译器
gcc编译器的安装
https://www.jianshu.com/p/1e1276e05f3f

1.首先整体的目录结构

[root@iZuf6ac930m7q6b48s3u34Z cmakedemo]# tree .
|-- CMakeLists.txt
|-- addlib
|   |-- CMakeLists.txt
|   |-- library.cpp
|   `-- library.h
|-- build
|   `-- main.cpp

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(addlib)

set(CMAKE_CXX_STANDARD 11)
add_library(addlib SHARED library.cpp library.h) # create a dynamic library file

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(accliblibrary) #define a projectname

set(CMAKER_CXX_STANDARD 11) # show the variable
add_subdirectory(addlib output)  # add sub directory of source code and define the directory where the binary code  is put

add_executable(cppproject main.cpp) #create an executable file cppproject

target_link_libraries(cppproject addlib) # 向target添加需要链接的共享库

下面就是编译该项目，生成可执行文件：
cd build/
cmake ..

make

./cppproject

1+....+10=45