linux-kernel - Re: [PATCH] powerpc: remove meaningless KBUILD

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Date:   Mon, 19 Aug 2019 13:25:52 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Segher Boessenkool <segher@...nel.crashing.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] powerpc: remove meaningless KBUILD_ARFLAGS addition

Hi,

On Fri, Jul 19, 2019 at 12:43 PM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> Segher Boessenkool <segher@...nel.crashing.org> writes:
> > On Thu, Jul 18, 2019 at 11:19:58AM +0900, Masahiro Yamada wrote:
> >> On Thu, Jul 18, 2019 at 1:46 AM Segher Boessenkool
> >> <segher@...nel.crashing.org> wrote:
> >> Kbuild always uses thin archives as far as vmlinux is concerned.
> >>
> >> But, there are some other call-sites.
> >>
> >> masahiro@pug:~/ref/linux$ git grep  '$(AR)' -- :^Documentation :^tools
> >> arch/powerpc/boot/Makefile:    BOOTAR := $(AR)
> >> arch/unicore32/lib/Makefile:    $(Q)$(AR) p $(GNU_LIBC_A) $(notdir $@) > $@
> >> arch/unicore32/lib/Makefile:    $(Q)$(AR) p $(GNU_LIBGCC_A) $(notdir $@) > $@
> >> lib/raid6/test/Makefile:         $(AR) cq $@ $^
> >> scripts/Kbuild.include:ar-option = $(call try-run, $(AR) rc$(1)
> >> "$$TMP",$(1),$(2))
> >> scripts/Makefile.build:      cmd_ar_builtin = rm -f $@; $(AR)
> >> rcSTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
> >> scripts/Makefile.lib:      cmd_ar = rm -f $@; $(AR)
> >> rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
> >>
> >> Probably, you are interested in arch/powerpc/boot/Makefile.
> >
> > That one seems fine actually.  The raid6 one I don't know.
> >
> >
> > My original commit message was
> >
> >     Without this, some versions of GNU ar fail to create
> >     an archive index if the object files it is packing
> >     together are of a different object format than ar's
> >     default format (for example, binutils compiled to
> >     default to 64-bit, with 32-bit objects).
> >
> > but I cannot reproduce the problem anymore.  Shortly after my patch the
> > thin archive code happened to binutils, and that overhauled some other
> > things, which might have fixed it already?
> >
> >> > Yes, I know.  This isn't about built-in.[oa], it is about *other*
> >> > archives we at least *used to* create.  If we *know* we do not anymore,
> >> > then this workaround can of course be removed (and good riddance).
> >>
> >> If it is not about built-in.[oa],
> >> which archive are you talking about?
> >>
> >> Can you pin-point the one?
> >
> > No, not anymore.  Lost in the mists of time, I guess?  I think we'll
> > just have to file it as "it seems to work fine now".
>
> Yeah I think so. If someone finds a case it breaks we can fix it then.
>
> > Thank you (and everyone else) for the time looking at this!
>
> Likewise.
>
> cheers


So, we agreed to apply this patch, right?

Please let me know if there is some improvement that should be get done.


-- 
Best Regards
Masahiro Yamada