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Kbuild: Use dtc's -d (dependency) option

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This hooks dtc into Kbuild's dependency system.

Thus, for example, "make dtbs" will rebuild tegra-harmony.dtb if only
tegra20.dtsi has changed yet tegra-harmony.dts has not. The previous
lack of this feature recently caused me to have very confusing "git
bisect" results.

For ARM, it's obvious what to add to $(targets). I'm not familiar enough
with other architectures to know what to add there. Powerpc appears to
already add various .dtb files into $(targets), but the other archs may
need something added to $(targets) to work.

Signed-off-by: Stephen Warren <[email protected]>
Acked-by: Shawn Guo <[email protected]>
[mmarek: Dropped arch/c6x part to avoid merging commits from the middle
of the merge window]
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Stephen Warren 2012-01-09 11:38:15 -07:00 • committed by Michal Marek
commit 7c43185138
5 changed files with 10 additions and 8 deletions
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4
arch/powerpc/boot/Makefile
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@ -334,8 +334,8 @@ $(obj)/treeImage.%: vmlinux $(obj)/%.dtb $(wrapperbits)
$(call if_changed,wrap,treeboot-$*,,$(obj)/$*.dtb)
# Rule to build device tree blobs
$(obj)/%.dtb: $(src)/dts/%.dts
$(call cmd,dtc)
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call if_changed_dep,dtc)
# If there isn't a platform selected then just strip the vmlinux.
ifeq (,$(image-y))