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

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Date:	Thu, 12 Apr 2012 21:47:19 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andi Kleen <andi@...stfloor.org>, 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 Sam,

On Thu, Apr 12, 2012 at 21:40, Sam Ravnborg <sam@...nborg.org> wrote:
> On Thu, Apr 12, 2012 at 09:08:36PM +0200, Geert Uytterhoeven wrote:
>> 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
>
> Could people move to this century and drop these ugly "\" line-continuations please...
> People seems to get along in C without but think they should be used in Makefiles..

Not without an additional patch for make:

Makefile:575: *** missing separator (did you mean TAB instead of 8
spaces?).  Stop.

>> 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.

> You should try cc-diasable-warning like this:
>
> KBUILD_CFLAGS += $(call cc-disable-warning, ipa-cp-clone)

That works, thanks!
Andi, does it still work as expected for you?

> from Documentation/kbuild/makefiles.txt:
>
>    cc-disable-warning
>        cc-disable-warning checks if gcc supports a given warning and returns
>        the commandline switch to disable it. This special function is needed,
>        because gcc 4.4 and later accept any unknown -Wno-* option and only
>        warn about it if there is another warning in the source file.
>
>        Example:
>                KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
>
>        In the above example, -Wno-unused-but-set-variable will be added to
>        KBUILD_CFLAGS only if gcc really accepts it.
>
>
> The documentation refer to gcc 4.4 - but maybe the older gcc you have
> has the same behaviour.

Seems to be that case. Thx!

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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