From: Pu Lehui <pulehui@xxxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx> --- tools/testing/selftests/bpf/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 7660d19b66c2..9905e3739dd0 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -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) -- 2.34.1
