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 14:53:04 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Sam Ravnborg <sam@...nborg.org>
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 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 "%/".


If net/Makefile contains at least one obj-y,
"make net/" will create built-in.o





> And maybe selftest, documentation shortcuts too?
> Other than that - looks good.
>
> Reviewed-by: Sam Ravnborg <sam@...nborg.org>
>
>         Sam
>
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-- 
Best Regards
Masahiro Yamada