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error: ld returned 1 exit status

bishoposiris (70)
I'm using Ubuntu 14.04 and gcc 4.8.2. I'm trying to compile the following code using this command:

g++ -Wall -W -std=c++11 game.cpp -o game

I'm getting the following error:

game.cpp:(.text+0x24): undefined reference to 'GameLoop::WelcomePlayer(sPlayer&)'
game.cpp:(.text+0x2f): undefined reference to 'GameLoop::RunGame()'
collect2: error: ld returned 1 exit status

Here is the part of my code where I'm assuming my error is:

game.cpp
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//#include "stdafx.h"
#include "Player.h"
#include "GameLoop.h"

int main(int argc, char* argv[])
{
	sPlayer player;
	GameLoop::WelcomePlayer(player);

	bool bIsPlaying = true;
	while(bIsPlaying)
	{
	  bIsPlaying = GameLoop::RunGame();
	}
	
	return 0;
}


GameLoop.cpp
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#include "GameLoop.h"
#include <iostream>
using namespace std;

namespace GameLoop
{
void WelcomePlayer(sPlayer& player)
{
	cout<< "What name shall adorn your gravestone? " << endl;
	
	cin>> player.m_name;

	cout<< endl << "Greetings " << player.m_name << endl;
}

void GivePlayerOptions()
{
	cout<< "What would you like to do? " << endl;
	cout<< "1: Quit" << endl;
}

void GetPlayerInput(string& playerInput)
{
	cin>> playerInput;
}

PlayerOptions EvaluateInput(string& playerInput)
{
	PlayerOptions chosenOption = PlayerOptions::None;

	if(playerInput.compare("1") == 0)
	{
	  cout<< "You have chosen to quit!" << endl;
	  chosenOption = PlayerOptions::Quit;
	}
	else
	{
	  cout<< "I do not recognize that option, try again." << endl;
	}

	return chosenOption;
}

bool RunGame()
{
	bool bShouldEnd = false;

	GivePlayerOptions();

	string playerInput;
	GetPlayerInput(playerInput);

	bShouldEnd = EvaluateInput(playerInput) == PlayerOptions::Quit;

	return !bShouldEnd;
}
}


GameLoop.h
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#pragma once
#include "Player.h"
#include "PlayerOptions.h"

namespace GameLoop
{
	void WelcomePlayer(sPlayer& player);
	void GivePlayerOptions();
	void GetPlayerInput(std::string& playerInput);
	PlayerOptions EvaluateInput(std::string& playerInput);
	bool RunGame();
}


Player.h
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#pragma once
#include <string>

struct sPlayer
{
	std::string m_name;
};


Any help would be appreciated. Thanks.
Zhuge (4664)
You need to include GameLoop.cpp on the command line otherwise those function definitions you supply won't be linked in.
bishoposiris (70)
That did it! Thank you.
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