Date: Thu, 5 Jan 2006 09:19:29 +0100
From: bert hubert <bert.hubert@netherlabs.nl>
To: linux-kernel@vger.kernel.org
Subject: heads up: Ubuntu Breezy GCC 4.0.2-prerelease miscompiles 2.6.15 with -Os
Message-ID: <20060105081928.GA13722@outpost.ds9a.nl>
Mail-Followup-To: bert hubert <bert.hubert@netherlabs.nl>,
	linux-kernel@vger.kernel.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.9i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1250
Lines: 34

Hi,

For Ubuntu and perhaps other pre-release shipping distribution users:

If you get errors like:
# ip route add default via 10.0.0.12
RTNETLINK answers: Network is unreachable

for no good reason, and you can't delete any routes either, you may be
compiling your kernel optimized for size (CONFIG_CC_OPTIMIZE_FOR_SIZE),
which is triggering a bug in your gcc 4.0.2 pre-release, or at a stretch, a
bug in the kernel.

The fix is to either turn off optimization for size ("-Os"), or to compile
with a real gcc 4.0.2 release and not a pre-release.

For more details see
http://marc.theaimsgroup.com/?l=linux-netdev&m=113641427215320&w=2 and
http://marc.theaimsgroup.com/?l=linux-netdev&m=113641859718902&w=2 and
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=322723

I'll be heading to the ubuntu bug tracker to see if this problem is there
already.

Good luck!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/