On Wed, 8 Aug 2012, Arnd Bergmann wrote: > The Linaro cross toolchain and probably others nowadays default to > building in THUMB2 mode. When building a kernel for a CPU that does > not support THUMB2, the compiler complains about incorrect flags. > We can work around this by setting -marm for all non-T2 builds. > > Without this patch, building assabet_defconfig results in: > > usr/initramfs_data.S:1:0: warning: target CPU does not support THUMB > instructions [enabled by default] > arch/arm/nwfpe/entry.S:1:0: warning: target CPU does not support THUMB > instructions [enabled by default] > firmware/cis/PCMLM28.cis.gen.S:1:0: warning: target CPU does not support > THUMB instructions [enabled by default] > (and many more) > > Signed-off-by: Arnd Bergmann <a...@arndb.de> > Cc: Russell King <rmk+ker...@arm.linux.org.uk> > Cc: Dave Martin <dave.mar...@linaro.org> > --- > arch/arm/Makefile | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm/Makefile b/arch/arm/Makefile > index 30eae87..b4c2296 100644 > --- a/arch/arm/Makefile > +++ b/arch/arm/Makefile > @@ -111,6 +111,9 @@ AFLAGS_THUMB2 :=$(CFLAGS_THUMB2) -Wa$(comma)-mthumb > ifeq ($(CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11),y) > CFLAGS_MODULE +=-fno-optimize-sibling-calls > endif > +else > +CFLAGS_THUMB2 :=-marm > +AFLAGS_THUMB2 :=-marm
CFLAGS_THUMB2 should probably be renamed to something more appropriate in this case, e.g. CFLAGS_MODE. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
