kbuild: remove obj-dtb-y, pbl-dtb-y, lwl-dtb-y syntax
...
The embedded DTBs are compiled by the chain of pattern rules as follows:
%.dts -> %.dtb -> %.dtb.S -> %.dtb.o for barebox proper
%.dts -> %.dtb -> %.dtb.S -> %.dtb.pbl.o for pbl
Barebox introduced {obj,pbl,lwl}-dtb-y syntax to put the intermediate
files into extra-y. The purposes of doing so were:
[1] prevent GNU Make from deleting the intermediate files
[2] include .*.cmd files
In contrast, Linux does not use a special syntax for embedding DTBs
into the kernel.
For example, as you see in arch/sh/boot/dts/Makefile of Linux 5.6,
obj-y += <basename>.dtb.o
... just works.
This is because scripts/Kbuild.include specifies .SECONDARY to cater
to [1], and scripts/Makefile.build adds the intermediates to 'targets'
to deal with [2].
Barebox had already imported the same code from Linux, so you can use
obj-y instead of obj-dtb-y, like Linux.
pbl-dtb-y and lwl-dtb-y are barebox-specific cases, so I added the
%.dtb.pbl.o pattern to intermediate_targets.
Going forward, please use obj-y, pbl-y, or lwl-y.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Masahiro Yamada
authored
on 19 May 2020
Sascha Hauer
committed
on 20 May 2020