linux-kernel - Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

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Message-ID: <516E67B2.20509@imgtec.com>
Date:	Wed, 17 Apr 2013 10:13:22 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Michal Marek <mmarek@...e.cz>,
	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	<linux-kbuild@...r.kernel.org>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

On 17/04/13 05:13, Vineet Gupta wrote:
> Hi James,
> 
> On 04/16/2013 09:23 PM, James Hogan wrote:
>> On 12/04/13 22:52, Stephen Warren wrote:
>>> +.SECONDARY: $(obj)/$(builtindtb-y).dtb.S
>> Note, this may not work if you're using CONFIG_ARC_BUILTIN_DTB_NAME,
>> since it'll have quotes around it, so you may instead need:
>> .SECONDARY: $(obj)/$(patsubst "%",%,$(builtindtb-y)).dtb.S
>>
>> (at least that's what's required for the metag equivalent)
>>
>>> +
>>>  dtbs:  $(addprefix  $(obj)/, $(builtindtb-y).dtb)
>> You might find the same thing here too.
> 
> Actually in my Makefile, the quotes are stripped off in the very beginning to
> avoid duplicating it in every place.
> 
> ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")
>     builtindtb-y    := $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))
> endif

Ah yes, I didn't notice that difference. I'll do the same thing for
metag (it only had 1 reference to it before).

Thanks
James

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