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From: boris@sftri.UUCP (B.Altman)
Newsgroups: net.lang.c
Subject: Re: Can #define `token-string' be empty?
Message-ID: <363@sftri.UUCP>
Date: Sun, 24-Feb-85 20:13:45 EST
Article-I.D.: sftri.363
Posted: Sun Feb 24 20:13:45 1985
Date-Received: Wed, 27-Feb-85 06:59:22 EST
References: <151@cci-bdc.UUCP> <282@cmu-cs-k.ARPA>
Organization: AT&T Bell Laboratories, Summit N.J.
Lines: 22

> 
> #ifndef EXTERN
> #define EXTERN extern
> #endif
> 
> Then the include file should contain declaratons of this form:
> 
> EXTERN int global_int;
> EXTERN struct marsupial *wombat;
> 
> Including the file normally causes these to be external declarations, that
> is, no space is allocated for the variables.  Then, in the source file where
> you want to actually have the variables' storage allocated, you just say
> 
> #define EXTERN
> #include "whatever.h"

This is not necessary on System V release 2 C compiler. You can omit extern
everywhere. ld will be able to handle those constructs.

			Boris Altman
			{ucbvax,ihnp4}!attunix!boris