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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: Portability and /**/
Message-ID: <6215@brl-smoke.ARPA>
Date: Sat, 1-Aug-87 23:09:55 EDT
Article-I.D.: brl-smok.6215
Posted: Sat Aug  1 23:09:55 1987
Date-Received: Sun, 2-Aug-87 10:57:16 EDT
References: <949@oakhill.UUCP> <23575@sun.uucp> <4983@prls.UUCP> <118@geovision.UUCP> <167@spar.SPAR.SLB.COM>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 15

In article <167@spar.SPAR.SLB.COM> hunt@spar.UUCP (Neil Hunt) writes:
>#define Same(token)		token
>#define	Join(left, right)	Join(left)right

Presumably the last line should have read
	#define	Join(left,right)	Same(left)right
but that still doesn't work in general, since the token resulting
from the macro expansion should not be spliced onto the token to
its right, at least not during macro scanning and replacement.

I think the outcome of the X3J11 work on this is that preprocessing
will be forced to tokenize, and splicing will require explicit use
of the new ## operator.  Meanwhile, the above trick (with the bug
fixed) is probably the most universal approach.  Be careful not to
include whitespace in the macro invocation argument list.