C++ Constructor undefined - c++

Question

I work on C++ project, i use CMake to build my file. My build fail cause
undefined reference to `Software::Software()'
, but I do not see the problem. If you have an idea, do not hesitate, thank you
Files architecture:
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 (who call the contructor of Software) :
#include "Software.h"
class SoftwaresConfigurations {
public:
SoftwaresConfigurations();
}
SoftwaresConfiguration.cpp :
#include "SoftwaresConfigurations.h"
SoftwaresConfigurations::SoftwaresConfigurations(){
Software software = Software();
}

Answer 1

You have fallen into the trap that is FILE(GLOB ...).
Re-running CMake should fix this, but you should probably move away from using GLOB to collect your source files. For example, you can list them explicitly as follows:
set(SOURCES src/main.cpp src/Softwares.cpp src/SoftwaresConfigurations.cpp)
I will explain what happened below.
The official documentation says the following:
We do not recommend using GLOB to collect a list of source files from your source tree. If no CMakeLists.txt file changes when a source is added or removed then the generated build system cannot know when to ask CMake to regenerate.
So what probably happened is that you created the project with just one source file. CMake ran the GLOB at configuration-time and found only the one .cpp file.
Then, you added two files (which CMake did not know about) and added the #include to your SoftwaresConfiguration.cpp. This triggers a rebuild. However, since CMake does not know about Softwares.cpp, it does not build that file and the linker produces an unreferenced symbol.