[18/18] kbuild: set -fconserve-stack option for gcc 4.5
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Message ID 200909142149.n8ELnJbp019009@imap1.linux-foundation.org
State New, archived
Headers show

Commit Message

Andrew Morton Sept. 14, 2009, 9:49 p.m. UTC
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(+)

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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 = \