Date: Sat, 22 Jul 2000 05:06:22 -0400 (EDT)
Message-Id: <200007220906.FAA11985@indy.delorie.com>
From: Eli Zaretskii <eliz AT delorie DOT com>
To: Geoff Keating <geoffk AT cygnus DOT com>
CC: dj AT delorie DOT com, djgpp-workers AT delorie DOT com, gcc AT gcc DOT gnu DOT org
In-reply-to: <jm66pzbaeh.fsf@envy.cygnus.com> (message from Geoff Keating on
	21 Jul 2000 11:33:58 -0700)
Subject: Re: GCC headers and DJGPP port
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> From: Geoff Keating <geoffk AT cygnus DOT com>
> Date: 21 Jul 2000 11:33:58 -0700
> 
> Note that:
> - size_t is defined by stdio.h and stddef.h and string.h and wchar.h;
> - NULL is defined by stdio.h and stddef.h and string.h and time.h and wchar.h;
> - wchar_t is defined by stdlib.h and stddef.h and wchar.h;
> 
> so you already have to test if NULL is defined before defining it.

Not if every definition of NULL says the same.  This is allowed by
ANSI/ISO C (AFAIK), and GCC quite rightfully doesn't print any warnings.

As for size_t and wchar_t, we have a private header that defines them,
which is included by all the headers that need those types.  There are
safeguards to prevent multiple typedefs.