linux-kernel - [PATCH] [1/98] kbuild: Disable -Wunused-but-set-variable for gcc 4.6.0

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Message-Id: <20110727003453.01E212403FF@tassilo.jf.intel.com>
Date:	Tue, 26 Jul 2011 17:34:53 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	davej@...hat.com, sam@...nborg.org, mmarek@...e.cz,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] [1/98] kbuild: Disable -Wunused-but-set-variable for gcc 4.6.0

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Dave Jones <davej@...hat.com>

[ upstream commit af0e5d565d2fffcd97d1e2d89669d627cc04e8b8 ]

Disable the new -Wunused-but-set-variable that was added in gcc 4.6.0
It produces more false positives than useful warnings.

This can still be enabled using W=1

[AK: dropped W=1 support in backport]
Signed-off-by: Dave Jones <davej@...hat.com>
Acked-by: Sam Ravnborg <sam@...nborg.org>
Tested-by: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: Michal Marek <mmarek@...e.cz>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Index: linux-2.6.35.y/Makefile
===================================================================
--- linux-2.6.35.y.orig/Makefile
+++ linux-2.6.35.y/Makefile
@@ -546,6 +546,9 @@ ifndef CONFIG_CC_STACKPROTECTOR
 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 endif
 
+# This warning generated too much noise in a regular build.
+KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
+
 ifdef CONFIG_FRAME_POINTER
 KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 else
--
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