g++ -o allacrost src/audio.o src/battle.o src/boot.o src/data.o src/engine.o src/global.o src/main.o src/map.o src/pause.o src/quit.o src/scene.o src/utils.o src/video/color.o src/video/coord_sys.o src/video/primative.o src/video/simpletext.o src/video/tgaread.o src/video/video.o  -lm -lSDL -lGL -lGLU -lIL -lILUT -lSDL_mixer -llua -llualib
src/main.o(.text+0x9ee): In function `main':
: undefined reference to `hoa_engine::GameSettings::SetTimer()'
src/main.o(.text+0xa0a): In function `main':
: undefined reference to `hoa_engine::GameModeManager::GetTop()'
src/main.o(.text+0xa37): In function `main':
: undefined reference to `hoa_engine::GameSettings::UpdateTime()'
src/main.o(.text+0xa44): In function `main':
: undefined reference to `hoa_engine::GameModeManager::GetTop()'
src/quit.o(.text+0x701): In function `hoa_quit::QuitMode::Update(unsigned)':
: undefined reference to `hoa_engine::GameModeManager::PopAll()'
collect2: ld returned 1 exit status
make: *** [allacrost] Error 1

// Free the top mode on the stack and pop it off
inline void GameModeManager::Pop() { 
	if (game_stack.size() > 0) {
		delete game_stack.back();
		game_stack.pop_back();
	}
}



// Pop off all game modes
void GameModeManager::PopAll() { 
	while (game_stack.size() > 0) {
		delete game_stack.back();
		game_stack.pop_back();
	}
}

class GameModeManager {
private:
	SINGLETON_DECLARE(GameModeManager)
	std::vector<GameMode*> game_stack;
public: 
	SINGLETON_METHODS(GameModeManager)
	
	void Pop();
        void PopAll();
	void Push(GameMode* gm);
	gmode GetGameType();
	GameMode* GetTop();
	void PrintStack();
};