From: Prasad Sodagudi <psodagud@codeaurora.org>
To: yamada.masahiro@socionext.com
Cc: gregkh@linuxfoundation.org, segher@kernel.crashing.org,
ghackmann@google.com, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org,
Prasad Sodagudi <psodagud@codeaurora.org>
Subject: [PATCH] kbuild: clang: disable unused variable warnings only when constant
Date: Tue, 6 Feb 2018 15:46:51 -0800 [thread overview]
Message-ID: <1517960811-21674-1-git-send-email-psodagud@codeaurora.org> (raw)
In-Reply-To: <CAK7LNAQ1d5t5-UHsF1ZJ9tNLpGgbMGnDoHdht9=wNy5kLDVyxw@mail.gmail.com>
Currently, GCC disables -Wunused-const-variable, but not
-Wunused-variable, so warns unused variables if they are
non-constant.
While, Clang does not warn unused variables at all regardless of
the const qualifier because -Wno-unused-const-variable is implied
by the stronger option -Wno-unused-variable.
Disable -Wunused-const-variable instead of -Wunused-variable so that
GCC and Clang work in the same way.
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
Makefile | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index 11aff0f..ca0a571 100644
--- a/Makefile
+++ b/Makefile
@@ -700,7 +700,6 @@ KBUILD_CFLAGS += $(stackp-flag)
ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
@@ -718,9 +717,9 @@ else
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
endif
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
ifdef CONFIG_FRAME_POINTER
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
else
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
next prev parent reply other threads:[~2018-02-06 23:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-06 21:24 unused-variable warning is getting disabled with clang Sodagudi Prasad
2017-12-07 6:26 ` Greg Kroah-Hartman
2017-12-08 2:16 ` Sodagudi Prasad
2017-12-18 15:32 ` Masahiro Yamada
2018-01-27 0:59 ` [PATCH] kbuild: clang: Disable -Wunused-const-variable warnings Prasad Sodagudi
2018-01-28 16:22 ` Segher Boessenkool
2018-01-29 16:35 ` Sodagudi Prasad
2018-01-29 17:08 ` Prasad Sodagudi
2018-01-29 23:57 ` Segher Boessenkool
2018-02-02 16:01 ` Masahiro Yamada
2018-02-06 23:46 ` Prasad Sodagudi [this message]
2018-02-07 0:22 ` [PATCH] kbuild: clang: disable unused variable warnings only when constant Masahiro Yamada
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