The .test.d dependency files are generated by the C pre-processor and list
actual #include dependencies. Skeleton headers are not #included directly;
they are merely needed before compilation starts so that the compiler can
find them.
Making them order-only prerequisites of .test.d means that a missing or
newly-generated skeleton does not invalidate the .test.d timestamp,
avoiding unnecessary recompilation and, more importantly, avoiding 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