linux-kernel - [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5

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Message-Id: <20090914201811.187B3B1757@basil.firstfloor.org>
Date:	Mon, 14 Sep 2009 22:18:11 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	sam@...nborg.org
Subject: [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5


The upcomming gcc 4.5 has a new -fconserve-stack option 
that tells the inliner to take stack frame size in account.
Set it if the compiler supports it.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux-2.6.31-rc3-ak/Makefile
===================================================================
--- linux-2.6.31-rc3-ak.orig/Makefile
+++ linux-2.6.31-rc3-ak/Makefile
@@ -575,6 +575,9 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-s
 # revert to pre-gcc-4.4 behaviour of .eh_frame
 KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
 
+# conserve stack if available
+KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
+
 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 # But warn user when we do so
 warn-assign = \
--
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