build: fix another regression in append-dtb fix

Filter out duplicate generated code for the same dts files

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/include/image.mk b/include/image.mk
index 2d7b1ef99860e22551f40729cb9463ddf801058b..96a8892115d4e399c46fbf2cc419ad9e2208e4f4 100644 (file)
--- a/include/image.mk
+++ b/include/image.mk
@@ -437,10 +437,14 @@ endef
 
 ifndef IB
 define Device/Build/dtb
+  ifndef BUILD_DTS_$(1)
+  BUILD_DTS_$(1) := 1
   $(KDIR)/image-$(1).dtb: FORCE
        $(call Image/BuildDTB,$(strip $(2))/$(1).dts,$$@)
 
   image_prepare: $(KDIR)/image-$(1).dtb
+  endif
+
 endef
 endif