[PATCH 1/3] ARM: pass -march=armv7-a when building NEON files with clang
From: arnd@arndb.de (Arnd Bergmann)
Date: 2016-02-08 14:27:27
Also in:
lkml
Subsystem:
arm port, library code, the rest · Maintainers:
Russell King, Andrew Morton, Linus Torvalds
clang ignores the -mfpu=neon flag when building with -march=armv6: In file included from lib/raid6/neon1.c:27: clang/3.8.0/include/arm_neon.h:28:2: error: "NEON support not enabled" There is no real need to build the file with -march=armv6 in a multi-CPU enabled kernel, as nothing in here will ever get called on an ARMv6 CPU. Adding -march=armv7 doesn't hurt and can only improve the code quality. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/lib/Makefile | 2 +- lib/raid6/Makefile | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 6c7a5b715584..5f6c7eb62cc3 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile@@ -39,7 +39,7 @@ $(obj)/csumpartialcopy.o: $(obj)/csumpartialcopygeneric.S $(obj)/csumpartialcopyuser.o: $(obj)/csumpartialcopygeneric.S ifeq ($(CONFIG_KERNEL_MODE_NEON),y) - NEON_FLAGS := -mfloat-abi=softfp -mfpu=neon + NEON_FLAGS := -mfloat-abi=softfp -mfpu=neon -march=armv7-a CFLAGS_xor-neon.o += $(NEON_FLAGS) obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o endif
diff --git a/lib/raid6/Makefile b/lib/raid6/Makefile
index 3b10a48fa040..4ef3e800fb39 100644
--- a/lib/raid6/Makefile
+++ b/lib/raid6/Makefile@@ -23,7 +23,7 @@ endif ifeq ($(CONFIG_KERNEL_MODE_NEON),y) NEON_FLAGS := -ffreestanding ifeq ($(ARCH),arm) -NEON_FLAGS += -mfloat-abi=softfp -mfpu=neon +NEON_FLAGS += -mfloat-abi=softfp -mfpu=neon -march=armv7-a endif ifeq ($(ARCH),arm64) CFLAGS_REMOVE_neon1.o += -mgeneral-regs-only
--
2.7.0