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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Abstract Syntax Tree for C programs
Date: Tue, 04 Jun 2019 14:26:57 -0700
Organization: None to speak of
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Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
[...]
> GNU C has a macro called "NAN", which could conflict with an ISO
> C program which used the same identifier, probably for the same purpose.

ISO C defines NAN in <math.h>.  N1570 7.12p5.  (It's defined if an only
if the implementation supports quiet NaNs for float.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */