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Message-ID: <1364973141-16354-1-git-send-email-vgupta@synopsys.com>
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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