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    Subject[PATCH AUTOSEL 5.0 218/262] selftests/bpf: suppress readelf stderr when probing for BTF support
    Date
    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),)
    --
    2.19.1
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