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Date: Mon, 1 Dec 2008 23:22:48 +0100
From: Roman Divacky <rdivacky@freebsd.org>
To: Dag-Erling Sm??rgrav <des@des.no>
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Cc: Alexander Leidinger <Alexander@leidinger.net>,
	Marius N??nnerich <marius@nuenneri.ch>,
	Tim Kientzle <kientzle@freebsd.org>,
	Ivan Voras <ivoras@freebsd.org>, freebsd-current@freebsd.org
Subject: Re: HOWTO in wiki: adding custom dtrace probes in the kernel
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On Mon, Dec 01, 2008 at 06:50:43PM +0100, Dag-Erling Sm??rgrav wrote:
> "Marius N??nnerich" <marius@nuenneri.ch> writes:
> > Tim Kientzle <kientzle@freebsd.org> wrote:
> > > Seems that SDT_PROBE() should be using C99s "variadic macro"
> > > feature.
> > Is the kernel compiled in C99 mode?
> 
> No, but it is compiled using a compiler that supports variadic macros
> and has for many years (even before C99), and variadic macros are
> already used in many places, including GEOM, ZFS and WITNESS.

are you sure? I am seeing -std=c99 in the kernel build. check 
sys/conf/kern.pre.mk. it has been introduced more than 2 years
ago in rev 1.75 of kern.pre.mk if I read it correctly.

roman