Date: Sat, 17 Dec 2005 16:20:12 -0500 (EST)
From: Nicolas Pitre <nico@cam.org>
Subject: Re: [2.6 patch] fix the EMBEDDED menu
In-reply-to: <20051214221702.GH7124@flint.arm.linux.org.uk>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: Andrew Morton <akpm@osdl.org>, Adrian Bunk <bunk@stusta.de>,
       torvalds@osdl.org, lkml <linux-kernel@vger.kernel.org>
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 <20051214221702.GH7124@flint.arm.linux.org.uk>
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On Wed, 14 Dec 2005, Russell King wrote:

> I believe there are instances where ARM fails if CC_OPTIMIZE_FOR_SIZE 
> is not set. Luckily we have assertions in the generated assembly to 
> flag these as assembly errors when they happen, rather than silently 
> continuing to build.

Actually that gcc problem was unrelated to -Os vs -O2.  I was able to 
produce a test case that triggered the bug even with -Os at the time.  
It is true that, for the kernel, using -Os made the gcc bug more 
unlikely, but it could have happened regardless.  This particular gcc 
bug was fixed quite a while ago so using either -O2 and -Os on ARM 
should be fine (especially since we fail the compilation if a bad 
compiler triggers the bug).


Nicolas
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