Re: [5/5] include tuning options into Makefile

On Monday 21 July 2008, Marvin wrote:

+# optimize for specific cpu
+ifeq ($(CONFIG_TUNE_RS64),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3Drs64)
+else ifeq ($(CONFIG_TUNE_POWER3),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3Dpower3)
+else ifeq ($(CONFIG_TUNE_POWER4),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3D$(P4CPU))
+else ifeq ($(CONFIG_TUNE_CELL),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3Dcell,-mtune=3Dcell)
+else ifeq ($(CONFIG_TUNE_POWER5),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3Dpower5,-mtune=3Dpowe=

r5)

+else ifeq ($(CONFIG_TUNE_POWER6),y)
+ =A0 =A0KBUILD_CFLAGS +=3D $(call cc-option,-mcpu=3Dpower6,-mtune=3Dpowe=

r6)

=A0endif
-else
-LDFLAGS_MODULE=A0+=3D arch/powerpc/lib/crtsavres.o

I think it would be easier to express this logic in Kconfig than in
Makefile.

+
+ifneq ($(CONFIG_OPT_EXCLUSIVE),y)
+ =A0 =A0KBUILD_CFLAGS :=3D $(subst mcpu,mtune,$(KBUILD_CFLAGS))
=A0endif
=A0

This still doesn't allow the most interesting case where you want to
optimize for a modern CPU but still allow older ones, e.g.
"-mcpu=3Dpower4 -mtune=3Dpower6".

	Arnd <><