netdev - Re: [net-2.6 PATCH] bonding: fix broken multicast with round-robin mode

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Message-Id: <20100331.140055.246389406.davem@davemloft.net>
Date:	Wed, 31 Mar 2010 14:00:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	andy@...yhouse.net, netdev@...r.kernel.org, lhh@...hat.com,
	fubar@...ibm.com, bonding-devel@...ts.sourceforge.net
Subject: Re: [net-2.6 PATCH] bonding: fix broken multicast with round-robin
 mode

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 31 Mar 2010 17:14:08 +0200

> ARCH=x86_64 CROSS_COMPILE=x86_64-unknown-linux- make vmlinux
> 
> so, it was a cross compiler :
> 
> /data/x86-64/bin/x86_64-unknown-linux-gcc-4.1.2 -v
> Using built-in specs.
> Target: x86_64-unknown-linux
> Configured with: ../gcc-4.1.2/configure --prefix=/data/x86-64
> --target=x86_64-unknown-linux --enable-languages=c --disable-shared
> --disable-multilib --disable-threads --disable-libssp --without-headers
> --disable-libmudflap
> Thread model: single
> gcc version 4.1.2

Funny how going back in time gives us better diagnostic messages from
the compiler :-)

FWIW I also didn't get the warning, and that was with gcc-4.5 built
from the gcc trunk just the other day.

I suspect this is to do with a change to what warnings get enabled by
default with the -W options we put in the cflags rather than gcc
losing the ability to detect this case.
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