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Re: GCC headers and DJGPP port
> From: Geoff Keating <geoffk@cygnus.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.