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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Thu, 03 Apr 2025 11:47:03 -0700
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scott@slp53.sl.home (Scott Lurndal) writes:
> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>>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.
>
> Some existing unix implementations at the time the standard was adopted
> had that behavior and the committee was not willing to break existing
> implementations.

You mean the POSIX standard, yes?  The C standard does not permit
<string.h> to include <stddef.h>.

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */