## 外部构建
# 1. 在当前目录下，创建build文件夹
mkdir build 
# 2. 进入到build文件夹
cd build
# 3. 编译上级目录的CMakeLists.txt，生成Makefile和其他文件
cmake ..
# 4. 执行make命令，生成target
make

6.5 【实战】CMake代码实践

6.5.1 最小CMake工程（5.3.1 目录）

目录结构

helloworld.cpp

#include <algorithm>
#include <iostream>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
using namespace std;int main(int argc, char *argv[]) {cout<<"hello world"<<endl;return 0; }

CMakeLists.txt

# Set the minimum version of CMake that can be used
cmake_minimum_required(VERSION 3.0)
# Set the project name
project (HELLO)
# Add an executable
add_executable(hello_cmake main.cpp)

#命令 mkdir build ->cd build -> cmake ..（build 文件下生成makefile 内容）  ->make 

6.5.2 多目录工程 - 直接编译(5.3.2)

目录

include 文件下

include/swap.h

#pragma once
#include <iostream>
using namespace std;class swap11 {
private:int _a;int _b;public:void run();void printInfo();swap11(int a, int b) {this->_a = a;this->_b = b;}
};

src/

#include "../include/swap.h"
// #include"swap.h"void swap11::run(){int temp;temp=_a;_a=_b;_b=temp;}void swap11::printInfo(){cout<<"_a:"<<_a<<endl;cout<<"_b:"<<_b<<endl;}

CMakeLists.txt.

# Set the minimum version of CMake that can be used
cmake_minimum_required(VERSION 3.0)
#project name
project(SWAP)
#head file pat
include_directories( include )#source directory files to var
add_subdirectory( src DIR_SRCS )#add executable file  
add_executable(swap_02 ${TEST_MATH})#add link library  

target_link_libraries(${FS_BUILD_BINARY_PREFIX}sqrt ${LIBRARIES})

6.5.3 多目录工程 - 生成库编译

# Set the minimum version of CMake that can be used
cmake_minimum_required(VERSION 3.0)
#project name  
project(SWAP_LIBRARY)
#add compile options
add_compile_options("-Wall -std=c++11")
#set CMAKE_BUILD_TYPE
set( CMAKE_BUILD_TYPE Debug )
# set output binary path  
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
############################################################
# Create a library
############################################################
#Generate the static library from the library sources
add_library( swap_library STATIC src/Swap.cpp )
target_include_directories( swap_lib PUBLIC ${PROJECT_SOURCE_DIR}/include )
############################################################
# Create an executable
############################################################
# Add an executable with the above sources
add_executable( swap_01 main.cpp )
# link the new swap_01 target with the swap_lib target
target_link_libraries( swap_01 swap_liby )

#命令 mkdir build ->cd build -> cmake ..（build 文件下生成makefile 内容）  ->make