[PATCH] Reapply "kbuild: Create directory for target DTB"

[Matthias Schiffer]

This reverts commit dd7699e37f289fa433f42c6bcc108468c8b198c0.

On powerpc, dtb-y is usually empty unless CONFIG_OF_ALL_DTBS is set. While
passing a DTB as a make target explicitly works fine, individual DTB
builds may also be pulled in as dependencies by cuImage.% and similar
targets. In this case, nothing creates the arch/powerpc/dts directory,
causing out-of-tree builds to fail.

Fixes: dd7699e37f28 ("Revert "kbuild: Create directory for target DTB"")
Signed-off-by: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
---
 scripts/Makefile.lib | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 1a965fe68e011..3fe0fc46badfe 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -389,7 +389,8 @@ $(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
 	$(call if_changed,wrap_S_dtb)
 
 quiet_cmd_dtc = DTC     $@
-cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
+cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
+	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 	$(DTC) -o $@ -b 0 \
 		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
-- 
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