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

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

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-03-27 21:23:49 +02:00
parent 9caa6f0aa7
commit ac11f36b33
1 changed files with 1 additions and 0 deletions
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include/image.mk
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@ -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/ \