On Jul 26, 2011, at 8:59 AM, Richard Purdie wrote: > On Tue, 2011-07-26 at 08:47 -0500, Kumar Gala wrote: >> On Jul 26, 2011, at 7:44 AM, Richard Purdie wrote: >> >>> Signed-off-by: Richard Purdie <[email protected]> >>> --- >>> meta/conf/machine/include/powerpc/arch-powerpc.inc | 45 >>> +++++++++++++++++++- >>> meta/conf/machine/include/tune-ppc603e.inc | 12 ++++- >>> meta/conf/machine/include/tune-ppce300c2.inc | 12 ++++- >>> meta/conf/machine/include/tune-ppce500.inc | 13 ++++-- >>> meta/conf/machine/include/tune-ppce500mc.inc | 12 ++++- >>> meta/conf/machine/include/tune-ppce500v2.inc | 12 ++++- >>> 6 files changed, 88 insertions(+), 18 deletions(-) >> >> One thing I'm wondering about as we do this is the ability to pass >> --with-cpu to gcc & [e]glibc configure to pickup proper optimized cfgs >> & libs for a given target. > > As far as I can tell, gcc 4.x has no --with-cpu option. We pass the > correct march and mtune options to the compiler at runtime through > CFLAGS and friends.
Hmm, gcc still supports this: http://gcc.gnu.org/install/configure.html --with-cpu=cpu --with-cpu-32=cpu --with-cpu-64=cpu Specify which cpu variant the compiler should generate code for by default. cpu will be used as the default value of the -mcpu= switch. This option is only supported on some targets, including ARM, i386, M68k, PowerPC, and SPARC. The --with-cpu-32 and --with-cpu-64 options specify separate default CPUs for 32-bit and 64-bit modes; these options are only supported for i386, x86-64 and PowerPC. http://gcc.gnu.org/install/specific.html powerpc-*-* You can specify a default version for the -mcpu=cpu_type switch by using the configure option --with-cpu-cpu_type. > You're already found the way to pass configuration to *libc using values > in TARGET_FPU to pickup the right configuration. > > Is there a use case we're missing? Yes, for [e]glibc we have optimized libc functions for a given / specific PPC processor. So we need someway to tell configure this. - k _______________________________________________ Openembedded-core mailing list [email protected] http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
