failing to call class from main function

[zuluMagic]

I am trying to call a class that i created from the main function of my program in code blocks.
main.cpp

  #include <iostream>
#include "display.h"
int main()
{
     Display d;
    return 0;
}

display.h

#ifndef DISPLAY_H
#define DISPLAY_H
class Display
{
    public:
        Display();
        virtual ~Display();

    protected:
    private:
    Display(const Display& other){}
        Display& operator=(const Display& other){}
};

#endif // DISPLAY_H 

display.cpp

#include "display.h"

Display::Display()
{
    //ctor
}

Display::~Display()
{
    //dtor
}

build messages:

||=== Build: Debug in igotthis (compiler: GNU GCC Compiler) ===|
/home/ron/Desktop-Development/igotthis/display.h||In member function ‘Display& Display::operator=(const Display&)’:|
/home/ron/Desktop-Development/igotthis/display.h|14|warning: no return statement in function returning non-void [-Wreturn-type]|
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o||In function `_start':|
(.text+0x20)||undefined reference to `main'|
||=== Build failed: 1 error(s), 1 warning(s) (0 minute(s), 0 second(s)) ===|

i have added the linked libraries GL, SDL2, and GLEW to build options. may you help me figure out whats going on here.

[Peter87]

It doesn't seem to find the main function. Are you only compiling display.cpp? Make sure you have added both main.cpp and display.cpp to the same project.

[zuluMagic]

I press the build icon when I have the main.cpp file opened. Not sure if that is how I add it to the project, I have also tried to right click on project name and clicking 'Add files recursively' with no success. If its a problem caused by my paths not working, how would I fix it? Sorry I am all over the place I am new to c++ and do not really know where to start to figure this out.