RE: RE : [lwip-users] APIPA / AutoIP / Zeroconf / RFC 3927 Module

[Spies, Dominik]

I also did this before..

-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Kieran Mansley
Sent: Dienstag, 22. Mai 2007 16:11
To: Mailing list for lwIP users
Subject: RE: RE : [lwip-users] APIPA / AutoIP / Zeroconf / RFC 3927
Module

On Tue, 2007-05-22 at 16:01 +0200, Spies, Dominik wrote:
> It's unlikely the comliler has a bug ;)

My guess is a typo on the include file name, or the wrong include path.

> I'm not a c expert, maybe this is caused by a cyclic include? Because:
> apipa.h includes etharp.h and netif.h
> netif.h includes apipa.h
> etharp.h includes netif.h
> 
> And if it is, how can one solve this?

Headers normally have something like this (where THIS_HEADER'S_CONSTANT
is replaced with something specific to that file):

#ifndef THIS_HEADER'S_CONSTANT
#define THIS_HEADER'S_CONSTANT

<insert rest of the header here>

#endif /* THIS_HEADER'S_CONSTANT */

That way the contents of each header are only included once in the
cycle.  Look at the other lwIP headers for examples of this.

Kieran



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