Date: Sat, 05 May 2001 09:40:58 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: jeffw AT darwin DOT sfbr DOT org
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CC: djgpp AT delorie DOT com
In-reply-to: <20010504160823.A19921@kendall.sfbr.org> (message from JT
	Williams on Fri, 4 May 2001 16:08:23 -0500)
Subject: Re: __DJGPP__ and MSDOS
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> Date: Fri, 4 May 2001 16:08:23 -0500
> From: JT Williams <jeffw AT darwin DOT sfbr DOT org>
> 
> % gcc -c hello.c
> In file included from hello.c:1:
> hello.h:6: warning: #warning Found msdos.   <-- does *not* see __DJGPP__
> % gcc -o hello.exe hello.o
> % ./hello.exe
> hello, world
> hello, djgpp   <-- but hello.c *does* see __DJGPP__
> hello, dos
> 
> 2. Compile `hello.c' with headers in this order:
> 	#include <stdio.h>
> 	#include "hello.h"
> 
> % gcc -c hello.c
> In file included from hello.c:2:
> hello.h:2: warning: #warning Found djgpp.   <--
> hello.h:6: warning: #warning Found msdos.
> % gcc -o hello.exe hello.o
> % ./hello.exe
> hello, world
> hello, djgpp   <--
> hello, dos
> 
> So, depending on header #include order, __DJGPP__ may not be defined
> and available for #ifdef testing inside `hello.h'.

I suspect that you don't have a specs file, or use specs from a later
GCC distribution.  GCC 2.7.x needs lib/specs to define the symbol
__DJGPP__ (and also __DJGPP_MINOR__) to the right values.

Compile with -v, and GCC will tell you where does it take specs, and
what other hidden arguments does it pass to cpp and cc1.