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>
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		| @@ -184,6 +184,7 @@ endef | |||||||
| # $(4) extra DTC flags | # $(4) extra DTC flags | ||||||
| define Image/BuildDTB | define Image/BuildDTB | ||||||
| 	$(TARGET_CROSS)cpp -nostdinc -x assembler-with-cpp \ | 	$(TARGET_CROSS)cpp -nostdinc -x assembler-with-cpp \ | ||||||
|  | 		$(DTS_CPPFLAGS) \ | ||||||
| 		-I$(DTS_DIR) \ | 		-I$(DTS_DIR) \ | ||||||
| 		-I$(DTS_DIR)/include \ | 		-I$(DTS_DIR)/include \ | ||||||
| 		-I$(LINUX_DIR)/include/ \ | 		-I$(LINUX_DIR)/include/ \ | ||||||
|   | |||||||
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