Path: utzoo!utgpu!water!watmath!clyde!att!pacbell!ames!fxgrp!ljz
From: ljz@fxgrp.UUCP (Lloyd Zusman)
Newsgroups: comp.lang.c
Subject: Re: Help needed with #include problems
Message-ID: <631@fxgrp.UUCP>
Date: 20 May 88 17:37:57 GMT
References: <28400001@ntvax> <6104@sigi.Colorado.EDU> <2955@ihlpe.ATT.COM>
Reply-To: ljz%fx.com@ames.arc.nasa.gov (Lloyd Zusman)
Organization: Master Byte Software, Los Gatos, California
Lines: 39

In article <2955@ihlpe.ATT.COM> dcon@ihlpe.UUCP (David Connet) writes:
 >  ...
 > Here is a method I often use ...
 >  ...
 > In the main file I do:
 > 
 > #define GLOBAL
 > #include "file.h"
 > #undef GLOBAL /* sometimes */
 > 
 > All other .c files just include file.h
 > 
 > In file.h:
 >  ...
 > #ifdef GLOBAL
 > #define EXTERN
 > #define INIT(x) = x
 > #else
 > #define EXTERN extern
 > #define INIT(x)
 > #endif
 > 
 > EXTERN int variable INIT(2);

Here's a slight variation that I use:

#ifdef GLOBAL
#define _ , 	    /* allows you to init multilple values ... see below */
#define EXTERN
#define INIT(x) = { x }	    /* note the braces */
#else
#define EXTERN extern
#define INIT(x)
#endif

EXTERN int variable INIT(2);
EXTERN int array[] INIT( 1 _ 2 _ 3 _ 4 );   /* this works! */

I saw this on the net a year or two ago.