linux-kernel - Re: [PATCH] kbuild: use -Oz instead of -Os when using clang

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Message-ID: <CAK7LNAQmR374j_+9_yxwsuVoZ+KOHcDq83_R2VC7WEcpqmn1hA@mail.gmail.com>
Date:   Wed, 12 Apr 2017 12:38:14 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Michal Marek <mmarek@...e.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Behan Webster <behanw@...verseincode.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Grant Grundler <grundler@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Peter Foley <pefoley2@...oley.com>
Subject: Re: [PATCH] kbuild: use -Oz instead of -Os when using clang

Hi Matthias,


2017-04-11 3:08 GMT+09:00 Matthias Kaehlcke <mka@...omium.org>:
> Hi Masahiro,
>
> El Fri, Mar 31, 2017 at 02:57:43AM +0900 Masahiro Yamada ha dit:
>
>> 2017-03-31 1:41 GMT+09:00 Matthias Kaehlcke <mka@...omium.org>:
>> > El Fri, Mar 31, 2017 at 01:03:02AM +0900 Masahiro Yamada ha dit:
>> >
>> >> 2017-03-28 10:19 GMT+09:00 Matthias Kaehlcke <mka@...omium.org>:
>> >> > This generates smaller resulting object code when compiled with clang.
>> >> >
>> >> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
>> >> > ---
>> >> >  Makefile | 3 ++-
>> >> >  1 file changed, 2 insertions(+), 1 deletion(-)
>> >> >
>> >> > diff --git a/Makefile b/Makefile
>> >> > index b2faa9319372..66bcdbf58371 100644
>> >> > --- a/Makefile
>> >> > +++ b/Makefile
>> >> > @@ -638,7 +638,8 @@ KBUILD_CFLAGS       += $(call cc-option,-fdata-sections,)
>> >> >  endif
>> >> >
>> >> >  ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
>> >> > -KBUILD_CFLAGS  += -Os $(call cc-disable-warning,maybe-uninitialized,)
>> >> > +KBUILD_CFLAGS  += $(call cc-option,-Oz,-Os)
>> >> > +KBUILD_CFLAGS  += $(call cc-disable-warning,maybe-uninitialized,)
>> >> >  else
>> >> >  ifdef CONFIG_PROFILE_ALL_BRANCHES
>> >> >  KBUILD_CFLAGS  += -O2 $(call cc-disable-warning,maybe-uninitialized,)
>> >> >
>> >>
>> >>
>> >>
>> >> This is the same as the following commit in LLVMLinux
>> >> except Author/Signed-off-by.
>> >>
>> >> Who should the authorship really belong to?
>> >
>> > (this time without html, sorry for the noise)
>> >
>> > It should belong to Behan, I missed to add a 'From' tag, sorry about
>> > that. Should I resend with the tag or can you fix it when applying the
>> > patch?
>>
>>
>> No need to re-send it.  I can fixup it manually.
>
> I couldn't locate this patch in your tree, has it been picked up?
>


I will pick this up shortly.  Sorry for the delay.



-- 
Best Regards
Masahiro Yamada