The 64-bit toolchain uses the wrong ISA variant for compiling 32-bit kernels, eve with -m32. Set -mcpu=powerpc which is the generic 32-bit powerpc machine type and scheduling model. 32-bit platforms and CPUs can override this with -mcpu= options that come later on the command line. This fixes a lot of build failures due to incompatible assembly when compiling 32-bit kernel with 64-bit toolchain. Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> --- arch/powerpc/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 95813df90801..7034b1ad50e0 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -27,6 +27,14 @@ KBUILD_ARFLAGS += --target=elf32-powerpc endif endif +ifdef CONFIG_PPC32 +# These options will be overridden by any -mcpu option that comes +# later on the command line, but they are needed to set a sane +# 32-bit cpu target for the 64-bit cross compiler. +KBUILD_CFLAGS += -mcpu=powerpc +KBUILD_AFLAGS += -mcpu=powerpc +endif + export CROSS32CC CROSS32AR ifeq ($(CROSS_COMPILE),) -- 2.17.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
