Re: [Dev-C++] linker errors

[Per W. <pw...@ia...>]

You didn't exactly send any source code for us to look at...

However, if you get multiple declarations of _pGame, I would suspect that
one header file contains a line 'GameEngine *pGame;' or similar. If that
include file is used by more than one cpp file (main.cpp and
GameEngine.cpp) then you'll get a link error.

In the header, the declaration should say 'extern GameEngine *pGame;' and
then in one of the source files, there should be a 'GameEngine *pGame;'.

Is GameEngine::m_pGameEngine declared as static? In that case, you should
declare a variable of that type in one of the cpp files.

/Per W


On Fri, 13 Jun 2003, Vlada Djurovic wrote:

> Hi.
>
> I just got a book about games programming and I got stuck in the first step.
> When trying to compile an example from the book, I keep getting linker
> errors. The output looks like this:
>
>  C:\Visual\engine\main.o
> [Warning] In function `GameEngine::GetFrameDelay(void)':
> //C/Visual/engine/main.cpp(.bss+0x0) C:\Visual\engine\main.cpp(.bss+0x0)
> multiple definition of `_pGame'
> //C/Visual/engine/GameEngine.h C:\Visual\engine\skeleton.o(.bss+0x0)
> first defined here
>  C:\Visual\engine\GameEngine.o
> [Warning] In function `_10GameEngineP11HINSTANCE__PcT2UsUsii':
>
> [Linker error] undefined reference to `GameEngine::m_pGameEngine'
>
>
> I can't figure out what this means. I tried looking for multiple definitions
> of   _pGame, but I can't find any. Can something else be causing this?
> As for the other error, m_pGameEngine is a member of GameEngine class and
> it's referenced only in the class constructor. Can somebody give me a hint
> about possible problems?
>
> Thanks.
> ------------
> Vlada
>
>
>
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