linux-kernel - [08/25] kbuild: Disable -Wunused-but-set-variable for gcc 4.6.0

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Date:	Tue, 22 Nov 2011 16:20:58 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Michal Marek <mmarek@...e.cz>
Subject: [08/25] kbuild: Disable -Wunused-but-set-variable for gcc 4.6.0

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

------------------
Content-Length: 983
Lines: 33

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

commit af0e5d565d2fffcd97d1e2d89669d627cc04e8b8 upstream.

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
[gregkh - No it can not for 2.6.32, but we don't care]

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: Greg Kroah-Hartman <gregkh@...e.de>

---
 Makefile |    3 +++
 1 file changed, 3 insertions(+)

--- a/Makefile
+++ b/Makefile
@@ -537,6 +537,9 @@ 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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