From: Dave Jones <davej@redhat.com>
To: Jesper Juhl <jesper.juhl@gmail.com>
Cc: Adrian Bunk <bunk@stusta.de>, Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [2.6 patch] offer CC_OPTIMIZE_FOR_SIZE only if EXPERIMENTAL
Date: Wed, 14 Dec 2005 19:40:06 -0500 [thread overview]
Message-ID: <20051215004006.GA19354@redhat.com> (raw)
In-Reply-To: <9a8748490512141428q29f39ca5x66d2c52e22aa9208@mail.gmail.com>
On Wed, Dec 14, 2005 at 11:28:13PM +0100, Jesper Juhl wrote:
> I should probably back this up with *why* it boggles my mind.
>
> -Os has been in EMBEDDED for ages, so it's not been tested by the
> majority of users with the wide range of compilers etc that people
> use.
Fedora has had this enabled most of the time for x86, x86-64, ia64,
s390, s390x, ppc32 and ppc64 for a long time. From time to time
when a gcc bug has been tickled it's been disabled again until its
been worked out, but for the most part, it's been a complete non-event
wrt regressions. In the ~2 years that we've had it enabled I recall
2-3 occasions where it broke something badly (and it was really noticable,
like "networking doesn't work any more", or "x86-64 stopped booting"[1]),
and once or twice when moving to a newer gcc point release, it tripped an ICE.
The RHEL4 kernel has also been built this way since day 1.
Dave
[1] In that particular case, it was broken asm-x86-64/ macros that
just happened to work at -O2 by chance, so it actually found latent bugs.
next prev parent reply other threads:[~2005-12-15 0:41 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-14 19:10 [2.6 patch] fix the EMBEDDED menu Adrian Bunk
2005-12-14 22:05 ` Andrew Morton
2005-12-14 22:13 ` [2.6 patch] offer CC_OPTIMIZE_FOR_SIZE only if EXPERIMENTAL Adrian Bunk
2005-12-14 22:18 ` Jesper Juhl
2005-12-14 22:28 ` Jesper Juhl
2005-12-15 0:40 ` Dave Jones [this message]
2005-12-15 5:24 ` David S. Miller
2005-12-15 15:01 ` Krzysztof Halasa
2005-12-15 17:35 ` Dave Jones
[not found] ` <7c3341450601191017o796faf45r2cc5c8e544dcfe11@mail.gmail.com>
2006-01-19 19:13 ` Dave Jones
2005-12-15 19:20 ` Denis Vlasenko
2005-12-14 22:22 ` Andrew Morton
2005-12-14 22:26 ` Adrian Bunk
2005-12-14 22:30 ` Russell King
2005-12-14 22:36 ` Linus Torvalds
2005-12-14 22:44 ` Adrian Bunk
2005-12-14 22:46 ` Adrian Bunk
2005-12-14 23:32 ` Linus Torvalds
2005-12-14 23:43 ` Adrian Bunk
2005-12-15 6:45 ` David S. Miller
2005-12-14 23:48 ` David S. Miller
2006-01-19 17:59 ` Eric Lammerts
2005-12-14 22:17 ` [2.6 patch] fix the EMBEDDED menu Russell King
2005-12-14 22:24 ` Adrian Bunk
2005-12-17 21:20 ` Nicolas Pitre
2005-12-15 13:01 ` Rogério Brito
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