lkml.org 
[lkml]   [2002]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: CONFIG_TINY
On Thu, Oct 31, 2002 at 07:33:01AM -0700, Tom Rini wrote:
> > If gcc regularly generates larger code with -Os the answer is to talk to
> > the gcc people, not to avoid using -Os...
> It's not that it does regularly, it's that it can, and if it does, it's
> not really a gcc bug from what I recall. So I don't think CONFIG_TINY
> should prefer -Os over -O2 but instead we should just ask the user what
> level of optimization they want. Remember, one of the real important
> parts of embedded systems is flexibility.

Not to stretch this point too long, but turning off inlined functions 'can'
make code bigger too. It usually doesn't.

I have no problem with the other suggestion that CONFIG_TINY specify a
template for a set of build options, but if CONFIG_TINY is used (either
as an option, or a template of options) -Os should always be preferred
over -O2. Whether the user can still override this or not is a different
issue from whether -Os should be preferred over -O2 when CONFIG_TINY is
specified.

Or specified more clearly: If the compiler optimization flag is configurable,
choosing CONFIG_TINY should default the optimization flag to -Os before it
defaults the optimization flag to -O2.

mark

--
mark@mielke.cc/markm@ncf.ca/markm@nortelnetworks.com __________________________
. . _ ._ . . .__ . . ._. .__ . . . .__ | Neighbourhood Coder
|\/| |_| |_| |/ |_ |\/| | |_ | |/ |_ |
| | | | | \ | \ |__ . | | .|. |__ |__ | \ |__ | Ottawa, Ontario, Canada
One ring to rule them all, one ring to find them, one ring to bring them all
and in the darkness bind them...

http://mark.mielke.cc/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:30    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site