Messages in this thread | | | Date | Mon, 14 Sep 2009 14:36:15 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5 |
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On Mon, 14 Sep 2009 22:18:11 +0200 (CEST) Andi Kleen <andi@firstfloor.org> wrote:
> > 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> > > --- > Makefile | 3 +++ > 1 file changed, 3 insertions(+) > > Index: linux-2.6.31-rc3-ak/Makefile > =================================================================== > --- linux-2.6.31-rc3-ak.orig/Makefile > +++ linux-2.6.31-rc3-ak/Makefile > @@ -575,6 +575,9 @@ 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)
Do we have any info about what effects this option has upon the generated code? Text size changes, runtime stack usage changes, etc?
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