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 <npig...@gmail.com> --- arch/powerpc/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 95813df90801..aa6464c81a9f 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -24,6 +24,12 @@ ifeq ($(HAS_BIARCH),y) ifeq ($(CROSS32_COMPILE),) CROSS32CC := $(CC) -m32 KBUILD_ARFLAGS += --target=elf32-powerpc + +# 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 endif -- 2.17.0
