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From: ado@elsie.UUCP
Newsgroups: comp.unix.wizards,comp.unix.questions
Subject: Re: need cpp macros to concatenate names
Message-ID: <7414@elsie.UUCP>
Date: Wed, 6-May-87 05:35:21 EDT
Article-I.D.: elsie.7414
Posted: Wed May  6 05:35:21 1987
Date-Received: Fri, 8-May-87 01:15:37 EDT
References: <634@calma.UUCP> <18010@sun.uucp>
Organization: NIH-LEC, Bethesda, MD
Lines: 27
Xref: utgpu comp.unix.wizards:2013 comp.unix.questions:1934
Summary: With an eye to the future

> > Our intent is to be portable to any System V machine with a minimum of
> > changes.
> > 
> > Anybody have a suggestion? (We know about m4 and sed, but we can't afford to
> > add another step to the compilation of many thousands of lines of code. . .)
> 
> . . .I suggest you use "m4" and/or "sed", since there's no
> *documented* way of gluing tokens together in pre-ANSI C.
> 
> The following trick works on the versions of the "Reiser" preprocessor
> that are distributed with AT&T UNIX releases. . .
> 
> 	#define concat(x,y) x/**/y

And if you think the code will have a good long lifetime, think about using

	#ifdef __STDC__
	#define concat(x,y) x ## y
	#else
	#define concat(x,y) x/**/y
	#endif

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