Date: Wed, 28 Oct 1998 21:36:01 -0800 From: John Polstra <jdp@polstra.com> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: current@FreeBSD.ORG Subject: Re: FreeBSD_cc_... Message-ID: <199810290536.VAA29610@austin.polstra.com> In-Reply-To: Your message of "Thu, 29 Oct 1998 08:25:24 %2B0300." <19981029082524.A16434@nagual.pp.ru>
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> John, why you choose to have such complex bitfielding-like thing
> in one variable? It is too difficult to compare with it. Imagine
> that next time GNU will issue release something like 2.7.2.1.12345,
> what happens with your cdefs.h checking then? Better way just put
> FreeBSD extensions version in separate variable without tracking GNU
> version at all. GNU compiler presence can be checked with __GNUC__
> predefined variable separately.
I wanted the variable to be self-contained, and interpretable without
the context of __GNUC__ and __GNUC_MINOR__. That simplifies the #ifs,
because it allows the use of just one comparison instead of several.
If you look at <sys/cdefs.h> you'll see what a mess results from
needing to check several variables.
We already do a similar thing with <osreldate.h> and __FreeBSD_version.
I think it's pretty unlikely that GNU will release a version with a
5-component revision number.
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Nobody ever went broke underestimating the taste of the American public."
-- H. L. Mencken
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