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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: pure C90 environment
Date: Mon, 04 May 2020 13:57:26 -0700
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Bart <bc@freeuk.com> writes:
[...]
> So it picks and chooses its compilers. (I assume size_t is not part of C90?)

size_t is defined in C90.  It's declared in <stddef.h> and several other
headers, including <string.h>, <stdlib.h>, etc.  (The implementations of
those headers have to play some tricks to avoid multiple definitions.)

-- 
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 */