From c6f71ad30b768266a8fcc42af719881e93739365 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 3 Nov 2017 16:08:12 +0100
Subject: [PATCH] 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>
---
 include/image.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/image.mk b/include/image.mk
index 2d7b1ef998..96a8892115 100644
--- 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