From: Andrew Morton <akpm@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, sam@ravnborg.org
Subject: Re: [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5
Date: Mon, 14 Sep 2009 14:36:15 -0700 [thread overview]
Message-ID: <20090914143615.9ee47a1a.akpm@linux-foundation.org> (raw)
In-Reply-To: <20090914201811.187B3B1757@basil.firstfloor.org>
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?
next prev parent reply other threads:[~2009-09-14 21:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-14 20:18 [PATCH] [0/5] kbuild: A couple of Kbuild fixes/improvements Andi Kleen
2009-09-14 20:18 ` [PATCH] [1/5] kbuild: Fix ld-option Makefile macro to really work Andi Kleen
2009-09-14 21:47 ` Sam Ravnborg
2009-09-15 13:01 ` Andi Kleen
2009-09-15 15:32 ` Sam Ravnborg
2009-09-14 20:18 ` [PATCH] [2/5] kbuild: Check if linker supports the -X option Andi Kleen
2009-09-14 20:18 ` [PATCH] [3/5] kbuild: Echo the record_mcount command Andi Kleen
2009-09-14 20:18 ` [PATCH] [4/5] kbuild: Fail build if recordmcount.pl fails Andi Kleen
2009-09-14 20:18 ` [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5 Andi Kleen
2009-09-14 21:36 ` Andrew Morton [this message]
2009-09-19 9:20 ` Sam Ravnborg
2009-09-20 12:04 ` Andi Kleen
2009-09-14 21:43 ` [PATCH] [0/5] kbuild: A couple of Kbuild fixes/improvements Sam Ravnborg
2009-09-14 21:47 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2009-08-05 21:51 Andi Kleen
2009-08-05 21:51 ` [PATCH] [5/5] kbuild: Set -fconserve-stack option for gcc 4.5 Andi Kleen
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