When clang's -Qunused-arguments is dropped from KBUILD_CPPFLAGS, it warns: clang-16: error: argument unused during compilation: '-fno-stack-clash-protection' [-Werror,-Wunused-command-line-argument] This flag is supported for 64-bit powerpc but not 32-bit, hence the warning. Just remove the flag from vgettimeofday-32.o's CFLAGS when using clang, as has been done for other flags previously. Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx> --- Cc: mpe@xxxxxxxxxxxxxx Cc: npiggin@xxxxxxxxx Cc: christophe.leroy@xxxxxxxxxx Cc: linuxppc-dev@xxxxxxxxxxxxxxxx --- arch/powerpc/kernel/vdso/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile index 769b62832b38..4ee7d36ce752 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -16,6 +16,11 @@ ifneq ($(c-gettimeofday-y),) CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE) CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc + # This flag is supported by clang for 64-bit but not 32-bit so it will cause + # an unused command line flag warning for this file. + ifdef CONFIG_CC_IS_CLANG + CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection + endif CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector) -- 2.39.0
