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

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Date:	Wed, 3 Apr 2013 12:44:00 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
CC:	<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>
Subject: Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

forgot to CC linux-arch

On 04/03/2013 12:42 PM, Vineet Gupta wrote:
> Currently, for every ARC kernel build I see the following:
>
> --------------->8-----------------
>   DTB    arch/arc/boot/dts/angel4.dtb.S
>   AS      arch/arc/boot/dts/angel4.dtb.o
>   LD      arch/arc/boot/dts/built-in.o
> rm arch/arc/boot/dts/angel4.dtb.S        <-- forces rebuild next iter
>   CHK     kernel/config_data.h
> --------------->8-----------------
>
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> Cc: Michal Marek <mmarek@...e.cz>
> Cc: Stephen Warren <swarren@...dia.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: linux-kbuild@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  scripts/Makefile.lib |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 07125e6..17f96f4 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -265,6 +265,8 @@ cmd_dt_S_dtb=						\
>  	echo '.balign STRUCT_ALIGNMENT'; 		\
>  ) > $@
>  
> +.PRECIOUS: $(obj)/%.dtb.S
> +
>  $(obj)/%.dtb.S: $(obj)/%.dtb
>  	$(call cmd,dt_S_dtb)
>  

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