`make O=/linux-build kselftest TARGETS=bpf` fails with
make[3]: *** No rule to make target '/linux-build/bpf/test_stub.o', needed by '/linux-build/bpf/test_verifier'
The same command without the O= part works, presumably thanks to the
implicit rule.
Fix by restoring the explicit $(OUTPUT)/test_stub.o rule.
Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
---
v1 -> v2: Remove $(CPPFLAGS)
tools/testing/selftests/bpf/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 3209c208f3b3..b334a6db15c1 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -89,6 +89,9 @@ $(notdir $(TEST_GEN_PROGS) \
$(OUTPUT)/urandom_read: urandom_read.c
$(CC) -o $@ $< -Wl,--build-id
+$(OUTPUT)/test_stub.o: test_stub.c
+ $(CC) -c $(CFLAGS) -o $@ $<
+
BPFOBJ := $(OUTPUT)/libbpf.a
$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/test_stub.o $(BPFOBJ)
--
2.23.0
