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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Wed, 02 Apr 2025 21:00:14 -0700
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scott@slp53.sl.home (Scott Lurndal) writes:

> bart <bc@freeuk.com> writes:
[...]
>> So it is not true that you need include stddef.h, nor obvious
>> that that is where NULL is defined, if you are used to having it
>> available indirectly.
>
> Indeed, and it is well documented.
>
> For example, in the POSIX description for the string functions
> you'll find the following statement:
>
>     [CX] Inclusion of the <string.h> header may also make visible
>          all symbols from <stddef.h>.  [Option End]
>
> This is true for a number of POSIX headers, include those you
> enumerate above.
>
> [CX] marks a POSIX extension to ISO C.

How strange.  I don't know why anyone would ever want either to
rely on or to take advantage of this property.  To make the extra
symbols visible, does there need to be something like

    #define __POSIX 1

to enable the non-conforming behavior?