C ++构造函数未定义

Question

我从事C ++项目，我使用CMake构建文件。我的构建失败原因

  

对`Software :: Software（）'的未定义引用

，但我看不到问题。如果您有想法，请不要犹豫，谢谢

文件体系结构：

CMake：

# cmake_minimum_required(VERSION <specify CMake version here>)
project(untitled)

cmake_minimum_required(VERSION 2.8.9)
set(CMAKE_CXX_STANDARD 11)

include_directories(include)

file(GLOB SOURCES "src/*.cpp")
add_executable(untitled ${SOURCES})

Software.h：

#include <string>
class Software{
    private : 
        std::string name;

    public :
        Software();
}

Software.cpp：

#include "Software.h"

Software::Software() {
    this->name = "defaultName";
}

SoftwaresConfigurations.h（称为软件的构造者）：

#include "Software.h"

class SoftwaresConfigurations {
    public:
        SoftwaresConfigurations();
}

SoftwaresConfiguration.cpp：

#include "SoftwaresConfigurations.h"

SoftwaresConfigurations::SoftwaresConfigurations(){
    Software software = Software();
}