From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 27 Mar 2022 19:23:49 +0000 (+0200)
Subject: build: add support for passing C preprocessor flags for DTS builds
X-Git-Url: http://git.openwrt.org/?a=commitdiff_plain;h=ac11f36b337da29f422d16776cf36c98013dcc77;p=openwrt%2Fstaging%2Fdedeckeh.git

build: add support for passing C preprocessor flags for DTS builds

Useful for adding #ifdefs based on build system provided definitions, or
for adding extra include paths

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

diff --git a/include/image.mk b/include/image.mk
index 275a0adcac..e5b52d0e97 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -184,6 +184,7 @@ endef
 # $(4) extra DTC flags
 define Image/BuildDTB
 	$(TARGET_CROSS)cpp -nostdinc -x assembler-with-cpp \
+		$(DTS_CPPFLAGS) \
 		-I$(DTS_DIR) \
 		-I$(DTS_DIR)/include \
 		-I$(LINUX_DIR)/include/ \