Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!ctrsol!uakari.primate.wisc.edu!ginosko!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!peregrine!ccicpg!taurus!capone!ndjc
From: ndjc@capone.UUCP (Nick Crossley)
Newsgroups: comp.lang.c
Subject: Re: Concatenating with a compile-time definition in "ANSI" CPP
Summary: V.4 preprocessor allows old stuff in transition mode
Message-ID: <264@capone.UUCP>
Date: 4 Oct 89 21:51:30 GMT
References: <470004@gore.com> <29351@watmath.waterloo.edu> <17936@pasteur.Berkeley.EDU> <11212@smoke.BRL.MIL>
Reply-To: ndjc@ccicpg.UUCP (Nick Crossley)
Organization: ICL NA, Irvine CA
Lines: 27

In article <11212@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:
>In article <17936@pasteur.Berkeley.EDU> hunt@ernie.Berkeley.EDU.UUCP (Jim Hunt) writes:
>>You can do this in non ANSI environments (at least Sun) with
>>#define MyInit(arg)   arg/**/Init
>>which is an ugly hack on the preprocessor, that is also defined
>>in the ANSI C preprocessor!
>
>What are you talking about?  That's two tokens, not one spliced one,
>in both Standard C and K&R C.  It was the UNIX (Reiser) cpp that was
>responsible for this misimplementation becoming widespread.

He might be referring to the preprocessor that is part of the AT&T
Unix V.4 compilation system.  In that, if the 'transition mode' flag
-Xt is given to cc, most if not all of the "Reiserisms", including
parameter substitution is strings and token pasting with comments,
are allowed, with a warning.  Since -Xt is the default at the moment,
it appears to the user that an 'ANSI C compiler' supports this
behaviour.  Of course, AT&T said at the V.4 developers conferences
that the default mode will not be -Xt in the next release, so you
should abviously start converting your code to the correct ANSI C
preprocessor forms, and certainly not write new code using the old
forms (at least, not without appropriate #ifs).
-- 

<<< standard disclaimers >>>
Nick Crossley, ICL NA, 9801 Muirlands, Irvine, CA 92718-2521, USA 714-458-7282
uunet!ccicpg!ndjc  /  ndjc@ccicpg.UUCP