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Message-ID: <411631EC.8050207@gnu.org>
Date: Sun, 08 Aug 2004 14:00:00 -0000
From: Andrew Cagney <cagney@gnu.org>
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To: Joel Brobecker <brobecker@gnat.com>
Cc: gdb-patches@sources.redhat.com, Andrew Cagney <cagney@redhat.com>,
        Peter Schauer <Peter.Schauer@regent.e-technik.tu-muenchen.de>,
        Kevin Buettner <kevinb@redhat.com>
Subject: Re: [RFC/AIX] xm-aix4.h - Can we remove NULL re-define?
References: <20040808045246.GE24160@gnat.com>
In-Reply-To: <20040808045246.GE24160@gnat.com>
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> config/xm-aix4.h contains the following definition:
> 
> | /* Brain death inherited from PC's pervades.  */
> | #undef NULL
> | #define NULL 0

I'd assume that the PC perversity was along the lines of either:
	-- NULL not defined
	-- #define NULL ((void *)0)
where PC is AIX running on an i386 (yea, right :-).

> Is this still needed? Where does this come from?
> 
> It looks pretty scary that a compiler would actually defined NULL
> as being non-zero. I have always heard that NULL is not garantied
> to be zero, but I've seen so much code kind of confusing NULL and
> zero that I thought nobody in their right mind would actually do
> otherwise...
> 
> If still necessary, can this be replaced by something like this in
> defs.h?
> 
>         #if (NULL != 0)
>         #undef NULL
>         #define NULL 0
>         #endif

So just delete it.

Andrew