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 <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Stephen Warren <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
 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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