Re: [PATCH bpf 1/2] selftests/bpf: fix test_verifier/test_maps make dependencies

[Stanislav Fomichev <sdf@xxxxxxxxxxx>]

On 07/16, Andrii Nakryiko wrote:
> e46fc22e60a4 ("selftests/bpf: make directory prerequisites order-only")
> exposed existing problem in Makefile for test_verifier and test_maps tests:
> their dependency on auto-generated header file with a list of all tests wasn't
> recorded explicitly. This patch fixes these issues.
Why adding it explicitly fixes it? At least for test_verifier, we have
the following rule:

	test_verifier.c: $(VERIFIER_TESTS_H)

And there should be implicit/builtin test_verifier -> test_verifier.c
dependency rule.

Same for maps, I guess:

	$(OUTPUT)/test_maps: map_tests/*.c
	test_maps.c: $(MAP_TESTS_H)

So why is it not working as is? What I'm I missing?