The .test.d dependency files are generated by the C preprocessor and list
the headers each test file actually #includes. Skeleton headers appear in
those generated lists, so the .test.o -> .skel.h dependency is already
tracked by the .d file content.
Making skeletons order-only prerequisites of .test.d means that a missing
or skipped skeleton does not prevent .test.d generation, and regenerating
a skeleton does not force .test.d to be recreated. This avoids unnecessary
recompilation and, more importantly, avoids build errors when a skeleton
was intentionally skipped due to a BPF compilation failure.
Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
---
tools/testing/selftests/bpf/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 781238152c4f..72f576a8236a 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -697,11 +697,11 @@ $(TRUNNER_TEST_OBJS): $(TRUNNER_OUTPUT)/%.test.o: \
$(TRUNNER_TEST_OBJS:.o=.d): $(TRUNNER_OUTPUT)/%.test.d: \
$(TRUNNER_TESTS_DIR)/%.c \
$(TRUNNER_EXTRA_HDRS) \
+ $$(BPFOBJ) | $(TRUNNER_OUTPUT) \
$(TRUNNER_BPF_SKELS) \
$(TRUNNER_BPF_LSKELS) \
$(TRUNNER_BPF_LSKELS_SIGNED) \
- $(TRUNNER_BPF_SKELS_LINKED) \
- $$(BPFOBJ) | $(TRUNNER_OUTPUT)
+ $(TRUNNER_BPF_SKELS_LINKED)
ifeq ($(filter clean docs-clean emit_tests,$(MAKECMDGOALS)),)
include $(wildcard $(TRUNNER_TEST_OBJS:.o=.d))
--
2.53.0