Linux下Cmake引用第三方静态库示例

# Linux下Cmake引用第三方静态库示例

> 构建静态库：https://www.milinger.com/a256.html

## 创建两个主要文件：demo.cpp、CMakeLists.txt

### 1. demo.cpp
```C++
#include <iostream>
#include <string>
#include "lib/signature.h"

int main(int argc, char *argv[]) {

std::string result;   // 签名

Signature mySign;
    
    result = mySign.sign("hello world");

std::cout << "sign return:" << result << std::endl;
    return 0;
}
```

### 2. CMakeLists.txt
```C++
# Cmake最低版本要求
cmake_minimum_required(VERSION 3.22)

# 项目名称
project(demo)

# C++库版本
set(CMAKE_CXX_STANDARD 17)

# 声明三方库的位置
set(LIB_PATH ${CMAKE_SOURCE_DIR}/lib)
link_directories(${LIB_PATH})

add_executable(demo demo.cpp)

# 声明用了哪些三方库
target_link_libraries(demo signature)
```

## 开始构建

### 1. 指定源码目录，生成构建目录
```Shell
cmake -S . -B build 
```
[![生成构建目录](/upload/202405/zTChmNJiwGvt6J7ClO.png "生成构建目录")](https://www.milinger.com/a257.html "生成构建目录")
### 指定目录开始构建
```shell
cmake --build build
```
[![构建成功](/upload/202405/wlGAAFb72YshSPw6m0.png "构建成功")](https://www.milinger.com/a257.html "构建成功")
# 构建完成，运行结果
[![构建成功](/upload/202405/JV4kpED6RojBjmT59E.png "生成文件")](https://www.milinger.com/a257.html "生成文件")

# 完成

Linux下使用Cmake构建静态库示例

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