Messages in this thread | | | Date | Thu, 31 Oct 2002 07:33:01 -0700 | From | Tom Rini <> | Subject | Re: CONFIG_TINY |
| |
On Thu, Oct 31, 2002 at 12:33:10AM -0500, Mark Mielke wrote: > 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...
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.
-- Tom Rini (TR1265) http://gate.crashing.org/~trini/ - 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/
| |