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ARC: [kbuild] Avoid DTB rebuilds if DTS are untouched

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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-----------------

This is because *.dts.S is intermediate file in dtb generation and is by
default deleted by make which needs a ".SECONDARY" hint to NOT do so.

This could have ideally been done in scripts/Makefile.lib - for benefit
of all, however .SECONDARY doesn't seem to work with wildcards.

Thanks to Stephen for suggesting .SECONDARY (vs .PRECIOUS) and making
that work using a non wildcard version in arch makefile.

Thanks to James Hogan for pointing out that *.dtb.S now needs to be
added to clean-files

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-04-16 08:43:58 +05:30
parent 5628832f4c
commit a89516b31c
1 changed files with 3 additions and 1 deletions
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4
arch/arc/boot/dts/Makefile
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@ -8,6 +8,8 @@ endif
obj-y += $(builtindtb-y).dtb.o
targets += $(builtindtb-y).dtb
.SECONDARY: $(obj)/$(builtindtb-y).dtb.S
dtbs: $(addprefix $(obj)/, $(builtindtb-y).dtb)
clean-files := *.dtb
clean-files := *.dtb *.dtb.S