cmake编译一个简单c++项目(demo)

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：

CMakeLists.txt	addlib		build		main.cpp

CMakeLists.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