[OLPC-devel] Re: [PATCH 0/4] Compile kernel with -fwhole-program
bunk at stusta.de
Thu Aug 24 17:49:19 EDT 2006
On Thu, Aug 24, 2006 at 04:24:28PM +0100, David Woodhouse wrote:
> Using a combination of these two compiler options for building kernel
> code leads to some useful optimisation -- especially with modules which
> are made up of a bunch of incestuous C files, where none of the global
> symbols actually _need_ to be visible outside the directory they reside
> in. File systems are a prime example of this -- on PPC64 I see a
> reduction in size of ext3.ko by 2.6%, jffs2.ko by 5%, cifs.ko by 8% and
> befs.ko by a scary 14%. Strangely, udf.ko seems to have _grown_ by 6.6%
> -- that'll probably be another optimisation bug like GCC PR28755.
Looks good. :-)
What kernel are your patches against?
2.6.18-rc4 gives me:
<-- snip -->
make: *** No rule to make target `/home/bunk/linux/linux-2.6.18-rc4/dummy.c', needed by `init/init.o'. Stop.
make: *** [init] Error 2
<-- snip -->
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