linux-kernel - [PATCH 2/2] selftests/lib.mk: silence some clang warnings that gcc already ignores

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Date: Tue, 28 May 2024 19:08:42 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Shuah Khan <shuah@...nel.org>
Cc: Beau Belgrave <beaub@...ux.microsoft.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mark Brown <broonie@...nel.org>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	sunliming <sunliming@...inos.cn>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Valentin Obst <kernel@...entinobst.de>,
	linux-kselftest@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	llvm@...ts.linux.dev,
	John Hubbard <jhubbard@...dia.com>,
	Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 2/2] selftests/lib.mk: silence some clang warnings that gcc already ignores

gcc defaults to silence (off) for the following warnings, but clang
defaults to the opposite. These warnings are not useful for kselftests,
so silence them for the clang builds as well:

    -Wno-address-of-packed-member
    -Wno-gnu-variable-sized-type-not-at-end

This eliminates warnings for the net/ and user_events/ kselftest
subsystems, in these files:

    ./net/af_unix/scm_rights.c
    ./net/timestamping.c
    ./net/ipsec.c
    ./user_events/perf_test.c

Cc: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 tools/testing/selftests/lib.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 2902787b89b2..41e879f3f8a2 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -50,6 +50,12 @@ else
 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 endif # CROSS_COMPILE
 
+# gcc defaults to silence (off) for the following warnings, but clang defaults
+# to the opposite. These warnings are not useful for kselftests, so silence them
+# for the clang builds as well.
+CFLAGS += -Wno-address-of-packed-member
+CFLAGS += -Wno-gnu-variable-sized-type-not-at-end
+
 CC := $(CLANG) $(CLANG_FLAGS) -fintegrated-as
 else
 CC := $(CROSS_COMPILE)gcc
-- 
2.45.1