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Date: Fri, 23 Jan 1998 01:54:05 +0100
From: Eivind Eklund <eivind@yes.no>
To: Ted Buswell <tbuswell@mediaone.net>
Cc: questions@FreeBSD.ORG
Subject: Re: determine OS version at compile time.
References: <199801220224.VAA09579@tbuswell.ne.mediaone.net>
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In-Reply-To: <199801220224.VAA09579@tbuswell.ne.mediaone.net>; from Ted Buswell on Wed, Jan 21, 1998 at 09:24:27PM -0500
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On Wed, Jan 21, 1998 at 09:24:27PM -0500, Ted Buswell wrote:
> 
> What's the best way to determine the version of the operating system
> that a given file is being compiled for?
> I'd like to do something like:
> 
> #if defined(__FreeBSD__)
> #if (FREEBSD_MAJOR > 2) && (FREEBSD_MINOR > 2) && (FREEBSD_PATCH < 5)
> ...
> #else
> ...
> #endif
> #endif

Go for <osreldate.h>.  It is upgraded with each major interface
change, and with each OS release.  Its format should be fairly obvious
(100000major + 10000minor + 1000patch + post-release-interface-changes).

Eivind.