Symbol Lookup Error when Executing Main

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C++

Linux

Ubuntu

Hello,

I'm working on my game framework in C++. It is composed of a shared library containing all the features and an executable used to test the features (The executable will eventually become a working game).

The library and executable both compile and link fine, but when I try to execute it, I get this error:

main/bin/debug/main: symbol lookup error: main/bin/debug/main: undefined symbol: _ZN7Survive8Graphics4TwoD6SpriteC1Ev

Survive::Graphics::TwoD::Sprite is a sprite class for 2D images.

I'm wondering, what would cause this error?

Sprite and Graphics2D, a class used to draw to a given Sprite, are both defined in Sprite.hpp and implemented in their respective .cpp files. Could this be a cause of the problem?

Here's the code to Main.cpp:

#include "system/App.hpp"
#include "graphics/2d/Sprite.hpp"
#include "game/2d/Entity2D.hpp"
#include <iostream>

//using namespace Survive::Math;
using namespace Survive::System;
using namespace Survive::Graphics;
using namespace Survive::Graphics::TwoD;
using namespace Survive::Game::TwoD;

int main(int argc, char* argv[]) {
	App *theApp = AppSingleton::instance();
	
	// create a new entity
	Entity2D entity;
	
	// Create a new blank 100x100 sprite, and obtain a Graphics2D object to draw to it.
	Graphics2D *gr = entity.create(100, 100);
	
	if (gr) {
		gr->beginDrawing();
		gr->pixelRGB(50, 50, 255, 1, 1);
		gr->endDrawing();
	}
	
	entity.setPosition(20, 20);
	
	theApp->addEntity(entity);
	
	return theApp->onExecute();
}

Some additional details:

• I'm working in Ubuntu, compiling from the command line using makefiles generated by premake.
• The constructor
  
  C++

  Survive::Graphics::TwoD::Sprite::Sprite()

  *is* defined in Sprite.cpp
• The relative locations of the executable and the shared library are not a problem, because I've been able to run the executable with the library, each in the same locations, before.

Any suggestions on how to fix this?

Note: I have no idea where this might originate, so if further code is necessary to find what's causing this, please tell me.

Thanks in advance!