CMAKE入门笔记

step1：简单一个main函数实现方法

CMakeFiles.txt:

cmake_minimum_required(VERSION 3.0)

set the project name project(Tutorial)

add_executable(Tutorial tutorial.cpp)

tutorial.cpp:

#include \<cmath>
#include \<cstdlib>
#include \<iostream>
#include \<string>
 
 int main(int argc, char* argv[]) {
     if (argc < 2) {
         std::cout << "Usage: " << argv[0] << " number" << std::endl;
         return 1;
              }
     // convert input to double
     const double inputValue = atof(argv[1]);
     // calculate square root
     const double outputValue = sqrt(inputValue);
     std::cout << "The square root of " << inputValue
                    << " is " << outputValue
               << std::endl;
     return 0; }

执行：

mkdir build
cd build
cmake ../  #会自动寻找上一级目录里的cmake文件
cd ..
./Tutorial 5

output:

The square root of 5 is 2.23607

文件解构：

step2:在定义头文件和库下实现

首先建一个文件夹MathFunctions。在/MathFunction 文件夹中创建一个文件mysqrt.cpp:

#include <iostream>
?
double mysqrt(double x) //自己实现的开平方根函数
{
  if (x <= 0) {
    return 0;
  }
?
  double result = x;
?
  // do ten iterations
  for (int i = 0; i < 10; ++i) {
    if (result <= 0) {
      result = 0.1;
    }
    double delta = x - (result * result);
    result = result + 0.5 * delta / result;
    std::cout << "Computing sqrt of " << x << " to be " << result << std::endl;
  }
  return result;
}

并且创建头文件MathFunctions.h:

double mysqrt(double x);

在库文件下也要新建cmakefile.txt：
add_library() 为创建静态或动态库，库名称自定(如Message), 静态库或动态库由两个关键字指定（STATIC、SHARED)。再添加生成库的源文件路径

add_library(MathFunctions mysqrt.cpp)

执行：

cd build
cmake ../
cmake --build .

参考：https://blog.csdn.net/m0_46327721/article/details/128517261