[cbootimage-configs PATCH v2] post.mk: Create dependency makefile by makefile rule

[Nikolaus Schulz <nikolaus.schulz-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>]

Creating the emmc image requires creating the bct file and the
bootloader image first.  These dependencies are written to a makefile
snippet that is created by the gen-image-deps.sh script.  But that
script is only invoked when the rule that creates the emmc image is run,
which is too late for creating the dependencies makefile.

Add a rule to post.mk that tells make how to create the dependencies
makefile; with that in place, make automatically makes the dependency
makefile before executing any other rules.

Signed-off-by: Nikolaus Schulz <nikolaus.schulz-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
---
 build/post.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/build/post.mk b/build/post.mk
index 979d8ce..a647c81 100644
--- a/build/post.mk
+++ b/build/post.mk
@@ -21,11 +21,12 @@ bcts: $(bcts)
 images: $(images)
 
 image_deps := $(addprefix .,$(addsuffix .d,$(images)))
+$(image_deps): .%.d : %.cfg
+	../../../build/gen-image-deps.sh $< $(@:.%.d=%) $@
 -include $(image_deps)
 
 %.bct: %.bct.cfg
 	cbootimage -gbct -$(soc) $< $@
 
 %.img: %.img.cfg
-	../../../build/gen-image-deps.sh $< $@ .$@.d
 	cbootimage -$(soc) $< $@
-- 
2.11.0