From: kagel AT quasar DOT bloomberg DOT com
Date: Fri, 10 May 1996 09:38:47 -0400
Message-Id: <9605101338.AA06148@quasar.bloomberg.com >
To: ugunther AT diamond DOT tufts DOT edu
Cc: djgpp AT delorie DOT com
In-Reply-To: <4mt6p0$rog@d2.tufts.edu> (ugunther@diamond.tufts.edu)
Subject: Re: DJGPP warning: ... locatopn of previous def
Reply-To: kagel AT dg1 DOT bloomberg DOT com

   From: ugunther AT diamond DOT tufts DOT edu (Ulrich Guenther)
   Date: 9 May 1996 16:33:36 GMT

   invoking djgpp2 (just installed) I get the error

   "c:/djgpp/include/math.h:57: warning: this is the location of the 
look at this line(57):      ^^ 
   previous definition"

   The prg runs anyway.

The compiler is warning you that a function you have prototyped in your code is
defined differently in math.h.  The message immediately preceding this one is
the one being referenced.  This message also indicates that the definition in
your code is at line 57.  This usually happens when porting UNIX code to DJGPP
as most UNIX compilers maintain the older definitions of functions or do not
define all functions.  UNIX programmers get used to adding the definitions
in-code.  Either way the UNIX compilers will pass them without notice but they
can conflict with the stricter definitions in the DJGPP headers.  Best to not
define functions which are already defined in the headers.  If you need reverse
compatible code put the define in a #if defined(__unix__) or the safer 
#if defined( __DGUX__ ) or even #if !defined( __GNUC__ ).

-- 
Art S. Kagel, kagel AT quasar DOT bloomberg DOT com

A proverb is no proverb to you 'till life has illustrated it.  -- John Keats