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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.std.c
Subject: Re: bit-fields of type unsigned long and unsigned long long
Date: Wed, 23 Jun 2021 10:22:10 -0700
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Philipp Klaus Krause <pkk@spth.de> writes:
>> Given that no compiler (to my knowledge - and I'd be very interested in
>> counter-examples) actually has extended integer types, that is surely
>> not a problem.
>
> I think they are mostly used in lesser-known compilers targeting
> embedded systems; but AFAIK both GCC and clang have a 24-bit extended
> integer type when targeting avr, also used as int24_t and uint24_t in
> stdint.h.

gcc's documentation says "GCC does not support any extended integer types.".
I don't see anything about 24-bit integers.

[...]

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */