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

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Message-ID: <CAK7LNARe61sBVL=zs7kb4BT5UgkBCYdKWa+esWZnT=j3idDdNw@mail.gmail.com>
Date:   Fri, 31 Mar 2017 02:57:43 +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,


2017-03-31 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.



-- 
Best Regards
Masahiro Yamada