linux-kernel - Re: [PATCH] clocksource: Fix build in non-OF case

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Date:	Thu, 28 Mar 2013 13:10:44 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robherring2@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Tomasz Figa <tomasz.figa@...il.com>,
	Axel Lin <axel.lin@...ics.com>
Subject: Re: [PATCH] clocksource: Fix build in non-OF case

On Thu, Mar 28, 2013 at 01:08:22PM +0000, Arnd Bergmann wrote:
> On Thursday 28 March 2013, Mark Brown wrote:

> > That still looks like it'll reference the function?

> Yes, that is intentional. The idea is to create a reference to the
> function so gcc doesn't complain about unused symbols if the function
> gets marked static, but at the same time mark the data structure we
> define as unused so gcc can drop the structure as well as the function
> if they are not referenced from anywhere else.  This should let us
> get away with fewer #ifdef hacks in the code, better build-time coverage
> but without producing larger object code.

So GCC is supposed to be smart enough to figure this out and users need
to not do the ifdefs?  I have to say this does seem a bit surprising
from a user point of view but it does make sense from a general niceness
point of view.

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