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

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Date:	Wed, 3 Apr 2013 12:42:21 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Michal Marek <mmarek@...e.cz>,
	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	<linux-kbuild@...r.kernel.org>
Subject: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

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)
 
-- 
1.7.10.4

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