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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>
This commit is contained in:
Andi Kleen 2009-09-18 12:49:37 -07:00 committed by Sam Ravnborg
parent c3c63b6bec
commit 8f7f5c9fc2
1 changed files with 3 additions and 0 deletions
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Makefile
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@ -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 = \