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Article #4556

Re: static and extern, and a variable be both ?

#4556
From: Jerry Coffin
Date: Thu, 04 Jan 1996 17:33
34 lines
1905 bytes
ahicks@netcom.com (Aaron Hicks at Netcom) wrote:

>   After much looking and little finding I have come to ask for your 
>assistance.  I'm working on a project in which we believed the best way
>to insure a 500K array was allocated corectly was to declare it as static  
>and then when we needed to use it in a nother program to declare it there as 
>an extern.  When we did this we got a variable undefined error during the
>linking of the programs.  Now my question is this a standard C compiler 
>thing or is this compiler wrong.  Below are the relative parts of the code:

[ ... ] 

>I have found that this will work if I just do not declare the array as 
>a static in the first place.  It then will work fine, but we a slightly 
>afraid that if we do not declare this as static when it is declared there
>may not be enough memory left after the other parts of this program have 
>ran of a while.

As long as the varaible is declared at file scope (i.e. outside any
function), it'll have static storage duration (which seems to be what
you want.)  If you use `static' explicitly, it will give the identifier
internal linkage, which means it will only be visible within that
translation unit. (i.e. that source module)

In short, it sounds like leaving the `static' off is exactly what you
need, and shouldn't cause a problem.
    Later,
    Jerry.

/* I can barely express my own opinions; I certainly can't
 * express anybody else's.
 *
 * The universe is a figment of its own imagination.
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Path: arc1-ca.pugleaf.net!news.rmii.com!usenet
From: jcoffin@rmii.com (Jerry Coffin)
Newsgroups: comp.std.c
Subject: Re: static and extern, and a variable be both ?
Date: Thu, 04 Jan 1996 17:33:43 GMT
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