Path: chuka.playstation.co.uk!news
From: Toby Hutton <thutton@cybec.com.au>
Newsgroups: scee.yaroze.programming.gnu_compiler
Subject: Re: implicit declaration of function : warning
Date: 17 Jun 1998 14:46:40 +1000
Organization: PlayStation Net Yaroze (SCEE)
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"Tim" <tim@no_spammusicweb.co.uk> writes:

> 
> Hi,
> I'm getting these warning's from the gnu compiler and was wondering
> if anyone could tell me what they mean.
> Tim.
> 
> main.c:30: warning: implicit declaration of function `PadInit'
> main.c:31: warning: implicit declaration of function `InitialiseGraphics'
> main.c:33: warning: implicit declaration of function `build_viewpoint'
> main.c:35: warning: implicit declaration of function `build_scene'
> main.c:37: warning: implicit declaration of function `InitAllLights'
> main.c:44: warning: implicit declaration of function `RenderWorld'

You're not prototyping your functions properly.  You're either making
calls to functions that appear later in the same module (file)
ie. main.c, or to functions in a different module without including a
header file with the exported prototypes.

So, you need to declare all your functions in order, making sure that
functions that are called by other functions appear before them -
callee before caller.  Or, if you like to have main() up the top, put
some prototypes before it.  eg.

int proc(int a, char b);

int main()
{
    proc(1, 'A');

    return 0;
}

int proc(int a, char b)
{
    // code...
}

Or, if these functions (PadInit, etc) are in different files, you need
to make a header file with prototypes and #include it at the top of
main.c
-- 
Toby.