netdev - Re: [PATCH net-next] ipv4: use IS_ENABLED() macro to cleanup code

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Message-ID: <1319616054.11727.19.camel@deadeye>
Date:	Wed, 26 Oct 2011 10:00:54 +0200
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] ipv4: use IS_ENABLED() macro to cleanup code

On Wed, 2011-10-26 at 08:34 +0200, Eric Dumazet wrote:
> Le mardi 25 octobre 2011 à 19:30 -0400, David Miller a écrit :
> 
> > net/ipv4/ip_sockglue.c: In function ‘do_ip_setsockopt’:
> > net/ipv4/ip_sockglue.c:523:29: error: ‘LOOPBACK4_IPV6’ undeclared (first use in this function)
> > net/ipv4/ip_sockglue.c:523:29: note: each undeclared identifier is reported only once for each function it appears in
> > 
> > This fails because ip_sockglue.c guards the net/transp_v6.h header
> > inclusion with a real CPP guard.
> 
> Yep, it seems compiler was not able to perform optimisation of dead
> code.
[...]

No, the compiler is just checking the code further than you wanted
before optimising it away.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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