From 8f7f5c9fc2966704579ff93f459ffa458bca6fc2 Mon Sep 17 00:00:00 2001
From: Andi Kleen <andi@firstfloor.org>
Date: Fri, 18 Sep 2009 12:49:37 -0700
Subject: [PATCH] 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@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index a3b7770..5e1e74c 100644
--- a/Makefile
+++ b/Makefile
@@ -615,6 +615,9 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
 # 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 = \
-- 
1.8.2.3