kbuild: add %.dtb.S and %.dtb to 'targets' automatically
Another common pattern that consists of chained commands is to compile
a DTB as binary data into the kernel image or a module. It is used in
several places in the source tree. Support it in the core Makefile.
$(call if_changed,dt_S_dtb) is more suitable than $(call cmd,dt_S_dtb)
in case cmd_dt_S_dtb is changed in the future.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Frank Rowand <frowand.list@gmail.com>
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index b1d938f..7f5bca0 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -279,8 +279,8 @@
echo '.balign STRUCT_ALIGNMENT'; \
) > $@
-$(obj)/%.dtb.S: $(obj)/%.dtb
- $(call cmd,dt_S_dtb)
+$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
+ $(call if_changed,dt_S_dtb)
quiet_cmd_dtc = DTC $@
cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \