Patchworkβ [18/18] kbuild: set -fconserve-stack option for gcc 4.5

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Submitter Andrew Morton
Date 2009-09-18 19:49:37
Message ID <200909181949.n8IJnbGT019416@imap1.linux-foundation.org>
Download mbox | patch
Permalink /patch/48629/
State New
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Comments

Andrew Morton - 2009-09-18 19:49:37
From: Andi Kleen <andi@firstfloor.org>

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>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

Patch

diff -puN Makefile~kbuild-set-fconserve-stack-option-for-gcc-45 Makefile
--- a/Makefile~kbuild-set-fconserve-stack-option-for-gcc-45
+++ a/Makefile
@@ -573,6 +573,9 @@  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 = \