Re: CONFIG_TINY

From: Mark Mielke (mark@mark.mielke.cc)
Date: Thu Oct 31 2002 - 00:33:10 EST

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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