linux-kernel - Re: [PATCH 2/2] Add CONFIG_READABLE

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Date:	Thu, 12 Apr 2012 21:08:36 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] Add CONFIG_READABLE_ASM

Hi Andi,

On Wed, Mar 28, 2012 at 20:51, Andi Kleen <andi@...stfloor.org> wrote:
> +ifdef CONFIG_READABLE_ASM
> +# Disable optimizations that make assembler listings hard to read.
> +# reorder blocks reorders the control in the function
> +# ipa clone creates specialized cloned functions
> +# partial inlining inlines only parts of functions
> +KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
> +                 $(call cc-option,-fno-ipa-cp-clone,) \
> +                 $(call cc-option,-fno-partial-inlining)
> +endif

This (now in linux-next) causes m68k/allmodconfig to fail for me:

  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      kernel/bounds.s
cc1: error: unrecognized command line option "-fno-ipa-cp-clone"

Somehow, "$(call cc-option,-fno-ipa-cp-clone,)" doesn't detect that my
toolchain (gcc version 4.1.2 20061115 (prerelease) (Ubuntu 4.1.1-21))
doesn't support this option.

I tried playing with the trailing comma (why do the first 2 tests have it,
and the 3rd one doesn't?), but that didn't make a difference.

linux-next builds (using a newer toolchain) don't show this.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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