Kbuild arm: LLVMLinux: Add Kbuild support for building arch arm with Clang
Protect more options for arm with cc-option so that we don't get errors when
using clang instead of gcc. Add more or different options when using clang as
well.
Change-Id: I766784273a1005abc09820671c8f4c8daacc2879
Author: Behan Webster <behanw@converseincode.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
Patch-mainline: linux-arm-kernel @ 22/04/14, 06:08
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>
Link: https://lore.kernel.org/lkml/1398146898-15009-1-git-send-email-behanw@converseincode.com/
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 82945ce..1369444 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -35,6 +35,9 @@
# This should work on most of the modern platforms
KBUILD_DEFCONFIG := multi_v7_defconfig
+ifeq ($(COMPILER),clang)
+KBUILD_CFLAGS += -Wa,-mno-warn-deprecated
+endif
# defines filename extension depending memory management type.
ifeq ($(CONFIG_MMU),)
@@ -43,15 +46,17 @@
endif
ifeq ($(CONFIG_FRAME_POINTER),y)
-KBUILD_CFLAGS +=-fno-omit-frame-pointer -mapcs -mno-sched-prolog
+KBUILD_CFLAGS +=-fno-omit-frame-pointer $(call cc-option,-mapcs,) $(call cc-option,-mno-sched-prolog,)
endif
ifeq ($(CONFIG_CPU_BIG_ENDIAN),y)
-KBUILD_CPPFLAGS += -mbig-endian
+KBUILD_CPPFLAGS += $(call cc-option,-mbig-endian)
+CHECKFLAGS += -D__ARMEB__
AS += -EB
LD += -EB
else
-KBUILD_CPPFLAGS += -mlittle-endian
+KBUILD_CPPFLAGS += $(call cc-option,-mlittle-endian)
+CHECKFLAGS += -D__ARMEL__
AS += -EL
LD += -EL
endif
@@ -108,7 +113,7 @@
tune-y := $(tune-y)
ifeq ($(CONFIG_AEABI),y)
-CFLAGS_ABI :=-mabi=aapcs-linux -mfpu=vfp
+CFLAGS_ABI :=-mabi=aapcs-linux $(call cc-option,-mno-thumb-interwork,) -mfpu=vfp
else
CFLAGS_ABI :=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)
endif
@@ -132,7 +137,7 @@
endif
# Need -Uarm for gcc < 3.x
-KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
+KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float $(call cc-option, -Uarm,)
KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float
CHECKFLAGS += -D__arm__ -m32