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selftests/bpf: Adapt OUTPUT appending logic to lower versions of Make

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The $(let ...) function is only supported by GNU Make version 4.4 [0]
and above, otherwise the following exception file or directory will be
generated:

	tools/testing/selftests/bpfFEATURE-DUMP.selftests
	tools/testing/selftests/bpffeature/

Considering that the GNU Make version of most Linux distributions is
lower than 4.4, let us adapt the corresponding logic to it.

Link: https://lists.gnu.org/archive/html/info-gnu/2022-10/msg00008.html [0]
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Link: https://lore.kernel.org/r/20240905081401.1894789-2-pulehui@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Pu Lehui 2024-09-05 08:13:52 +00:00 committed by Alexei Starovoitov
parent bd4d67f8ae
commit dc3a8804d7
1 changed files with 6 additions and 0 deletions
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6
tools/testing/selftests/bpf/Makefile
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@ -187,8 +187,14 @@ FEATURE_TESTS := llvm
FEATURE_DISPLAY := $(FEATURE_TESTS)
# Makefile.feature expects OUTPUT to end with a slash
ifeq ($(shell expr $(MAKE_VERSION) \>= 4.4), 1)
$(let OUTPUT,$(OUTPUT)/,\
$(eval include ../../../build/Makefile.feature))
else
OUTPUT := $(OUTPUT)/
$(eval include ../../../build/Makefile.feature)
OUTPUT := $(patsubst %/,%,$(OUTPUT))
endif
endif
ifeq ($(feature-llvm),1)