heads up: Ubuntu Breezy GCC 4.0.2-prerelease miscompiles 2.6.15 with -Os

heads up: Ubuntu Breezy GCC 4.0.2-prerelease miscompiles 2.6.15 with -Os

[bert hubert]

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!

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