Re: #ifndef/#ifdef problems in my header file (conditional header inclusion)

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#3644

From: James Youngman
Date: Fri, 03 Jan 1997 00:00

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In article <gnusenetraub-2412960039190001@dialup52.afn.org>, 
raub@kushana.aero.ufl.edu says...

[ ... ] What I am
>finding out is that is not the case.  Running C programs that have similar 
>conditional including of header files in gcc (Sparc), Think C (Mac), Borland
>TC++ 3.1 for Windows (PC), and SAS/C (Amiga) results in the same thing.  It
>really seems that the compiler simply *forgets* what was defined in the
>previous .c file and define them all over again.  

That's the way it's supposed to work.   It's called "separate compilation".

>As a result, my object files
>become unnecessarily large.  Yes, the executable seems to take care of that,
>but still I am using more disk space than I should.  I am open for suggestions
>as usual.

Make sure you don't put *definitions* or *initialisations* in header files, 
just *declarations*.

-- 
James Youngman       VG Gas Analysis Systems |The trouble with the rat-race 
 Before sending advertising material, read   |is, even if you win, you're 
http://www.law.cornell.edu/uscode/47/227.html|still a rat.

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From: JYoungman@vggas.com (James Youngman)
Subject: Re: #ifndef/#ifdef problems in my header file (conditional header inclusion)
Date: 1997/01/03
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