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>
diff --git a/Makefile b/Makefile
index a3b7770..5e1e74c 100644
--- a/Makefile
+++ b/Makefile
@@ -615,6 +615,9 @@
# 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 = \