linux_dsm_epyc7002/arch/arc/boot/dts/Makefile
Vineet Gupta a89516b31c ARC: [kbuild] Avoid DTB rebuilds if DTS 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-----------------

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>
2013-04-17 18:19:14 +05:30

16 lines
343 B
Makefile

# Built-in dtb
builtindtb-y := angel4
ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")
builtindtb-y := $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))
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 *.dtb.S