netdev - [PATCH v2 bpf-next] selftests/bpf : clean up feature/ when make clean

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Date:   Mon, 10 Jun 2019 17:43:07 -0700
From:   Hechao Li <hechaol@...com>
To:     <bpf@...r.kernel.org>
CC:     <netdev@...r.kernel.org>, <daniel@...earbox.net>, <ast@...nel.org>,
        <kernel-team@...com>, Hechao Li <hechaol@...com>
Subject: [PATCH v2 bpf-next] selftests/bpf : clean up feature/ when make clean

An error "implicit declaration of function 'reallocarray'" can be thrown
with the following steps:

$ cd tools/testing/selftests/bpf
$ make clean && make CC=<Path to GCC 4.8.5>
$ make clean && make CC=<Path to GCC 7.x>

The cause is that the feature folder generated by GCC 4.8.5 is not
removed, leaving feature-reallocarray being 1, which causes reallocarray
not defined when re-compliing with GCC 7.x. This diff adds feature
folder to EXTRA_CLEAN to avoid this problem.

v2: Rephrase the commit message.

Signed-off-by: Hechao Li <hechaol@...com>
Acked-by: Andrii Nakryiko <andriin@...com>
---
 tools/testing/selftests/bpf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 2b426ae1cdc9..44fb61f4d502 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -279,4 +279,5 @@ $(OUTPUT)/verifier/tests.h: $(VERIFIER_TESTS_DIR) $(VERIFIER_TEST_FILES)
 		 ) > $(VERIFIER_TESTS_H))
 
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(ALU32_BUILD_DIR) \
-	$(VERIFIER_TESTS_H) $(PROG_TESTS_H) $(MAP_TESTS_H)
+	$(VERIFIER_TESTS_H) $(PROG_TESTS_H) $(MAP_TESTS_H) \
+	feature
-- 
2.17.1