From mboxrd@z Thu Jan  1 00:00:00 1970
From: Corinna Vinschen <corinna.vinschen@cityweb.de>
To: John Zheng <Yien@usa.net>, cygwin@sourceware.cygnus.com
Subject: Re: compiling file 3.26
Date: Wed, 31 Mar 1999 19:45:00 -0000
Message-ID: <36E29663.7B7D74A8@cityweb.de>
References: <Pine.GSU.4.05.9903070052510.15188-100000@viking.cris.com>
X-SW-Source: 1999-03n/msg00167.html
Message-ID: <19990331194500.C6zYevWAShqmXD8gN2BcTVAuKEKcrJ_cRljr4zQ1E70@z>

John Zheng wrote:
> 
> Corinna,
> 
> I downloaded file-3.26.tar.gz from ftp.astron.com, and tried to compile it.
> 
> Near the end of compilation, I get the error:
> [...]
> /a/cygnus/file-3.26/file.c:202: undefined reference to `errno'
> [...]
> Do you know what the problem is?  errno appears to be defined as:
> 
> extern int errno;               /* Some unixes don't define this..      */

The `extern' declaration of errno must be substituted with

#include <errno.h>

Cygwin defines errno not as a global variable, but as a
#define to a function call. This is needed, because it
wouldn't be reentrant else.

Regards,
Corinna



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