linux-kernel - Re: [PATCH 04/10] ARM: ftrace: allow building without frame pointers

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Message-ID: <1266948185.24271.6079.camel@gandalf.stny.rr.com>
Date:	Tue, 23 Feb 2010 13:03:05 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rabin Vincent <rabin@....in>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Ingo Molnar <mingo@...hat.com>,
	Abhishek Sagar <sagar.abhishek@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 04/10] ARM: ftrace: allow building without frame
 pointers

On Tue, 2010-02-23 at 23:28 +0530, Rabin Vincent wrote:

> The easiest option to have a more obvious message than a linker error
> would be to add something like this in entry-common.S:
> 
>   #if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) \
> 	&& !defined(OLD_MCOUNT)
>   #warning Ftrace on GCC < 4.4 requires frame pointers
>   #endif
> 
> Messages like this are also present in other places in ARM (for example
> arch/arm/kernel/unwind.c), so this wouldn't be this first.
> 
> Note that the above message would help in all cases except the one where
> someone builds the kernel with !fp and GCC 4.4+, and then builds a
> module with an older GCC.  That would still be only a linker error.

I was going to recommend the #if above. But shouldn't it be a #error
instead of a #warning?

-- Steve


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