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Subject[PATCH] Add -target to clang switch while cross compiling.
Date
Update to llvm excludes assembly instructions.
llvm git revision is below

commit 2865ab6996164e7854d55c9e21c065fad7c26569
Author: Yonghong Song <yhs@fb.com>
Date: Mon Sep 18 23:29:36 2017 +0000

bpf: add inline-asm support

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313593 91177308-0d34-0410-b5e6-96231b3b80d8

__ASM_SYSREG_H define is not required for native compile.
-target switch includes appropriate target specific files
while cross compiling

Tested on x86 and arm64.

Signed-off-by: Abhijit Ayarekar <abhijit.ayarekar@caviumnetworks.com>
---
samples/bpf/Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index ebc2ad6..81f9fcd 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -180,6 +180,7 @@ CLANG ?= clang
# Detect that we're cross compiling and use the cross compiler
ifdef CROSS_COMPILE
HOSTCC = $(CROSS_COMPILE)gcc
+CLANG_ARCH_ARGS = -target $(ARCH)
endif

# Trick to allow make to be run from this directory
@@ -229,9 +230,9 @@ $(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
$(obj)/%.o: $(src)/%.c
$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
-I$(srctree)/tools/testing/selftests/bpf/ \
- -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
+ -D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
-D__TARGET_ARCH_$(ARCH) -Wno-compare-distinct-pointer-types \
-Wno-gnu-variable-sized-type-not-at-end \
-Wno-address-of-packed-member -Wno-tautological-compare \
- -Wno-unknown-warning-option \
+ -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
--
2.7.4
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