From: "John M. Aldrich" <fighteer AT NO DOT SPAM DOT cs DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: dos/unix defines
Date: Mon, 21 Apr 1997 08:40:39 +0000
Organization: Two pounds of chaos and a pinch of salt
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Andrew Deren wrote:
> 
> Does anyone know what #define I have to use to detect whether a program is
> compiled on DOS or UNIX. I use Borland C++ and DJGPP for DOS and gcc and
> CC for unix if that matters.

You can pass the '-E -dM' parameters to gcc to see only a list of the
preprocessor macros that are defined when you compile your programs.

To detect Unix, use #ifdef(unix).
To detect MS-DOS, use #ifdef(MSDOS).
To detect DJGPP, use #ifdef(DJGPP).
To detect GNU C, use #ifdef(__GNUC__).

On some compilers (such as DJGPP), both 'unix' and 'MSDOS' will be
defined due to the nature of the compiler.

-- 
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| John M. Aldrich, aka Fighteer I |     mailto:fighteer AT cs DOT com      |
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