linux-kernel - Re: [PATCH] kbuild: add %/built-in.o target in top Makefile

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Date:   Tue, 1 Nov 2016 22:59:05 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Michal Marek <mmarek@...e.com>
Cc:     Wei Yang <richard.weiyang@...il.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: add %/built-in.o target in top Makefile

On Tue, Nov 01, 2016 at 05:27:34PM +0100, Michal Marek wrote:
>On 2016-10-24 14:45, Wei Yang wrote:
>
>> diff --git a/Makefile b/Makefile
>> index addb235..546998e 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -1627,6 +1627,8 @@ endif
>>  	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>>  %.symtypes: %.c prepare scripts FORCE
>>  	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> +%/built-in.o: prepare scripts
>> +	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>
>This rule gets in the way of
>
>   975  # The actual objects are generated when descending,
>   976  # make sure no implicit rule kicks in
>   977  $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>

Yes, second level built-in.o is built because of this rule, while for deeper
level built-in.o we don't have a rule now. This patch is trying to add a rule
for those deeper level built-in.o.

>Quickly looking at the Makefile, it may be fine, but it needs to be
>confirmed. This also explains why the current behavior with */built-in.o
>is inconsistent.
>

Agree with you. 

One of my concern is whether it is necessary to add "FORCE" to the prerequest.
I have tried on my machine, it works fine without "FORCE", while maybe it
won't work fine with some version of "make".

This is what I want to confirm. Any other potential issue, just let me know.

Thanks for your comment :-)

>Michal

-- 
Wei Yang
Help you, Help me