cmake 单个目录多个文件的情况

参考：https://www.hahack.com/codes/cmake/#

源文件一共有三个：main.cpp、MathFunctions.h、MathFunctions.cpp

文件内容分别如下：

main.cpp

#include <stdio.h>
#include <stdlib.h>
#include "MathFunctions.h"

int main(int argc, char *argv[])
{
    if (argc < 3){
        printf("Usage: %s base exponent 
", argv[0]);
        return 1;
    }
    double base = atof(argv[1]);
    int exponent = atoi(argv[2]);
    double result = power(base, exponent);
    printf("%g ^ %d is %g
", base, exponent, result);
    return 0;
}

MathFunctions.h

#ifndef POWER_H
#define POWER_H

extern double power(double base, int exponent);

#endif

MathFunctions.cpp

 /**
 * power - Calculate the power of number.
 * @param base: Base value.
 * @param exponent: Exponent value.
 *
 * @return base raised to the power exponent.
 */
double power(double base, int exponent)
{
    int result = base;
    int i;

    if (exponent == 0) {
        return 1;
    }
    
    for(i = 1; i < exponent; ++i){
        result = result * base;
    }

    return result;
}

CMakeLists.txt内容如下：

# CMake 最低版本号要求
cmake_minimum_required (VERSION 2.8)

# 项目信息
project (Demo2)

# 查找目录下的所有源文件
# 并将名称保存到 DIR_SRCS 变量
aux_source_directory(. DIR_SRCS)

# 指定生成目标
add_executable(Demo ${DIR_SRCS})

这里需要学习的是使用变量获取目录下的所有源文件：

aux_source_directory(. DIR_SRCS)

# 指定生成目标
add_executable(Demo ${DIR_SRCS})

编译及执行结果如下：

wmz@ubuntu:~/Desktop/testcmake1$ cmake .
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /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: /usr/bin/c++
-- Check for working CXX compiler: /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: /home/wmz/Desktop/testcmake1
wmz@ubuntu:~/Desktop/testcmake1$ make 
Scanning dependencies of target Demo
[ 33%] Building CXX object CMakeFiles/Demo.dir/MatnFunctions.cpp.o
[ 66%] Building CXX object CMakeFiles/Demo.dir/main.cpp.o
[100%] Linking CXX executable Demo
[100%] Built target Demo
wmz@ubuntu:~/Desktop/testcmake1$ ls
CMakeCache.txt       CMakeLists.txt  Makefile
CMakeFiles           Demo            MathFunctions.h
cmake_install.cmake  main.cpp        MatnFunctions.cpp
wmz@ubuntu:~/Desktop/testcmake1$ ./Demo 2 3
2 ^ 3 is 8