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Date: Thu, 31 Oct 2002 00:33:10 -0500
From: Mark Mielke <mark@mark.mielke.cc>
To: Tom Rini <trini@kernel.crashing.org>
Cc: Adrian Bunk <bunk@fs.tum.de>, Rasmus Andersen <rasmus@jaquet.dk>,
       linux-kernel@vger.kernel.org
Subject: Re: CONFIG_TINY
Message-ID: <20021031053310.GB4780@mark.mielke.cc>
References: <20021030233605.A32411@jaquet.dk> <Pine.NEB.4.44.0210310145300.20835-100000@mimas.fachschaften.tu-muenchen.de> <20021031011002.GB28191@opus.bloom.county>
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On Wed, Oct 30, 2002 at 06:10:02PM -0700, Tom Rini wrote:
> On Thu, Oct 31, 2002 at 01:53:14AM +0100, Adrian Bunk wrote:
> > could you try to use "-Os" instead of "-O2" as gcc optimization option
> > when CONFIG_TINY is enabled? Something like the following (completely
> > untested) patch:
> -Os can produce larger binaries, keep in mind.  If we're going to go
> this route, how about something generally useful, and allow for general
> optimization level / additional CFLAGS to be added.

Sure CFLAGS should be configurable, but CONFIG_TINY should always prefer
-Os over -O2. From 'man gcc':

       -Os Optimize for size.  -Os enables all -O2 optimizations that do not
           typically increase code size.  It also performs further optimiza-
           tions designed to reduce code size.

If gcc regularly generates larger code with -Os the answer is to talk to
the gcc people, not to avoid using -Os...

mark

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