[PATCH] Add -target to clang switches while cross compiling.
From: Abhijit Ayarekar
Date: Thu Oct 12 2017 - 16:46:16 EST
Latest llvm update excludes assembly instructions.
As a result __ASM_SYSREGS_H define is not required.
-target switch includes appropriate target specific files.
Tested on x86 and arm64 with llvm with git revision
commit df6ca162269f9d756f8742bf4b658dcf690e3eb5
Author: Yonghong Song <yhs@xxxxxx>
Date: Thu Sep 28 02:46:11 2017 +0000
bpf: add new insns for bswap_to_le and negation
Signed-off-by: Abhijit Ayarekar <abhijit.ayarekar@xxxxxxxxxxxxxxxxxx>
---
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