[PATCH bpf-next v2 01/10] selftests/bpf: Adapt OUTPUT appending logic to lower versions of Make

[Pu Lehui]

From: Pu Lehui <pulehui at huawei.com>

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]
Signed-off-by: Pu Lehui <pulehui at huawei.com>
---
 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