linux-kernel - Re: [PATCH 1/2] kbuild: create built-in.o automatically if parent directory wants it

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Date:   Thu, 9 Nov 2017 17:08:38 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Michal Marek <mmarek@...e.com>
Subject: Re: [PATCH 1/2] kbuild: create built-in.o automatically if parent
 directory wants it

Hi Masahiro.

On Thu, Nov 09, 2017 at 02:53:04PM +0900, Masahiro Yamada wrote:
> Hi Sam,
> 
> Thanks for your review.
> 
> 2017-11-09 14:35 GMT+09:00 Sam Ravnborg <sam@...nborg.org>:
> > Hi Masahiro.
> >
> > Thanks for picking this up.
> >
> >> A key point is, the parent Makefile knows whether built-in.o is needed
> >> or not.  If a subdirectory needs to create built-in.o, its parent can
> >> tell the fact when Kbuild descends into it.
> > Good observation!
> >>
> >> diff --git a/Makefile b/Makefile
> >> index 008a4e5..cc0b618 100644
> >> --- a/Makefile
> >> +++ b/Makefile
> >> @@ -1003,7 +1003,7 @@ $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
> >>
> >>  PHONY += $(vmlinux-dirs)
> >>  $(vmlinux-dirs): prepare scripts
> >> -     $(Q)$(MAKE) $(build)=$@
> >> +     $(Q)$(MAKE) $(build)=$@ need-builtin=1
> >
> > The need-bultin may also be required for the shortcuts
> > that allows one to use:
> >
> >         make <dir>/
> >
> >     example:
> >
> >         make net/
> 
> 
> I do not want to add need-builtin=1 for single targets.
> 
> 
> make scripts/
> would create false scripts/built-in.o
> This is odd.
> 
> I wrote the solution in the commit log:
>   $(obj-y) should be still checked to support the single target "%/".

I missed this bit in the commit log,
but I almost commented on this in the patch itself.
Good way to do it.

	Sam