Date: Sun, 27 May 2001 19:07:37 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: "Paul Gardiner" <paul AT laser-point DOT co DOT uk>
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In-reply-to: <9er4iu$g26$1@newsg2.svr.pol.co.uk> (paul@laser-point.co.uk)
Subject: Re: Questions about overlay files
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> From: "Paul Gardiner" <paul AT laser-point DOT co DOT uk>
> Newsgroups: comp.os.msdos.djgpp
> Date: Sun, 27 May 2001 15:58:10 +0100
> 
> Sorry, I'm not explaining myself at all well.  What I want to do is write a
> replacement for glide2x.ovl.  As far as I know, this is a sort of dll, but
> for DOS rather than Windows.

I don't know what glide2x.ovl is, but from the file name it doesn't
sound as if it is a DLL.  Anyway, it is probably specific to the
compiler used to produce the program which can load this file.  Binary
compatibility between executable formats produced by different
compilers is not something you can rely on.

> > In a nutshell, DJGPP is a compiler and a suite of development tools.
> 
> That's what I thought really, but I guess what I don't understand is how it
> relates to other development systems for DOS, with regard to compatibility.

It doesn't: there's no compatibility at all.  Chapter 17 of the FAQ
explains what little compatibility there is, but the bottom line is:
you cannot practically use binary files produced by other compilers,
or produce binary files that other compilers can use.