Newsgroups: comp.lang.c
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: 3B2 cpp #ifdef + #include
Message-ID: <1988Apr1.233810.12882@utzoo.uucp>
Organization: U of Toronto Zoology
References: <109@iquery.UUCP> <3127@csli.STANFORD.EDU>
Date: Fri, 1 Apr 88 23:38:10 GMT

> I've found the relevant statement in 3.8.1: "[when a group is skipped]
> directives are processed only through the name that determines the directive
> in order to keep track of the level of nested conditionals; the rest of the
> directives' preprocessing tokens are ignored...
> the non-VMS system is obliged to stop reading after the word "ifdef" in the
> second line, and NOT complain about the "$"...

Ah, but if the $ is not in the C character set the compiler is willing to
accept (outside comments and strings), then $ is arguably *not* a
preprocessing token at all!  Section 2.2.1 makes the compiler's action
in this case undefined, so the compiler is not wrong to complain.

(Note that I say "arguably"; there is some hairsplitting that could be
invoked here as a result of some fuzzy wording.)
-- 
"Noalias must go.  This is           |  Henry Spencer @ U of Toronto Zoology
non-negotiable."  --DMR              | {allegra,ihnp4,decvax,utai}!utzoo!henry