From owner-freebsd-arch Mon Aug 13 9:58:39 2001
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Date: Mon, 13 Aug 2001 19:58:26 +0300
From: Ruslan Ermilov <ru@FreeBSD.ORG>
To: "David O'Brien" <obrien@FreeBSD.ORG>
Cc: Alexey Zelkin <phantom@FreeBSD.ORG>,
Bruce Evans <bde@FreeBSD.ORG>, arch@FreeBSD.ORG
Subject: Re: __RCSID() and __VERSION() macros and their ``static const char'' equivalents
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In-Reply-To: <20010813094549.A94831@dragon.nuxi.com>; from obrien@FreeBSD.ORG on Mon, Aug 13, 2001 at 09:45:49AM -0700
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On Mon, Aug 13, 2001 at 09:45:49AM -0700, David O'Brien wrote:
> On Mon, Aug 13, 2001 at 05:41:14PM +0300, Alexey Zelkin wrote:
> > I raised almost same questions two months ago. We even came to
> > conclusion, but David asked to suspend this task until he'll make
> > some kinds of this black magic in FreeBSD src tree (to avoid merge
> > conflicts). But I still not hear anything back.
>
> Acutally I am waiting to hear back from you and BDE about the proposals I
> made in June (last message I sent on the topic was 21-June-2001).
>
>
> > > What is the reason why we should use the old style VCS ID declarations
> > > like this:
> > >
> > > static const char rcsid[] =
> > > "$FreeBSD$";
> > >
> > > instead of their modern equivalent, <sys/cdefs.h> __RCSID() macro?
>
> __RCSID() should be forgotten about. It is a lost cause like using
> "$Id$". There is just too much imported and barrowed code that uses
> __RCSID for us to try to use it also (I tried). I have a few ideas on
> the topic and let see if the small group of us discussing the issue can
> flush something out.
>
I can't see what's wrong with current implementation of __RCSID(),
it definitely works.
> > > Not only the macro is backwards compatible in the non-gcc or non-ELF
> > > case, but it also "produces" more compact objects.
>
> How is it going to produce more compat objects [all the time for GCC and
> non-GCC compilers]. I believe you mean in some implimentations.
>
Umm, there are two versions of lower level __IDSTRING():
#if defined(__GNUC__) && defined(__ELF__)
#define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
#else
#define __IDSTRING(name,string) static const char name[] __unused = string
#endif
And the version using ``.ident'' produces more compact objects.
Just check it!
Cheers,
--
Ruslan Ermilov Oracle Developer/DBA,
ru@sunbay.com Sunbay Software AG,
ru@FreeBSD.org FreeBSD committer,
+380.652.512.251 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
http://www.oracle.com Enabling The Information Age
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