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SubjectRe: [PATCH] kbuild: use -Oz instead of -Os when using clang
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@chromium.org>:
> > This generates smaller resulting object code when compiled with clang.
> >
> > Signed-off-by: Matthias Kaehlcke <mka@chromium.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?

Matthias

> commit 186e62808239c603bfa308d5ea994a10d67bb409
> Author: Behan Webster <behanw@converseincode.com>
> Date: Thu Oct 16 14:28:54 2014 +0200
>
> LLVMLinux: use -Oz instead of -Os when using clang
>
> This generates smaller resulting object code when compiled with clang.
>
> Signed-off-by: Behan Webster <behanw@converseincode.com>
>
>

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