From: Stanislav Fomichev sdf@google.com

[ Upstream commit 2f0921262ba943fe9d9f59037a033927d8c4789b ]

Before: $ make -s -C tools/testing/selftests/bpf readelf: Error: Missing knowledge of 32-bit reloc types used in DWARF sections of machine number 247 readelf: Warning: unable to apply unsupported reloc type 10 to section .debug_info readelf: Warning: unable to apply unsupported reloc type 1 to section .debug_info readelf: Warning: unable to apply unsupported reloc type 10 to section .debug_info

After: $ make -s -C tools/testing/selftests/bpf

v2: * use llvm-readelf instead of redirecting binutils' readelf stderr to /dev/null

Signed-off-by: Stanislav Fomichev sdf@google.com Acked-by: Song Liu songliubraving@fb.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/bpf/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 41ab7a3668b3..936f726f7cd9 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -96,6 +96,7 @@ $(BPFOBJ): force CLANG ?= clang LLC ?= llc LLVM_OBJCOPY ?= llvm-objcopy +LLVM_READELF ?= llvm-readelf BTF_PAHOLE ?= pahole

PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1) @@ -132,7 +133,7 @@ BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \ - readelf -S ./llvm_btf_verify.o | grep BTF; \ + $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \ /bin/rm -f ./llvm_btf_verify.o)

ifneq ($(BTF_LLVM_PROBE),)