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    SubjectRe: [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5
    On Mon, Sep 14, 2009 at 02:36:15PM -0700, Andrew Morton wrote:
    > 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?

    I merged this despite the relevant questions above was not answered.
    But maybe we should wait until Andi gets back with numbers?

    Sam


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