Merge pull request #1780 from pmanish87/master

Make device tree pre-processing similar to U-boot/Linux

Makefile

@@ -242,6 +242,7 @@ TF_LDFLAGS		+=	--gc-sections
 TF_LDFLAGS		+=	$(TF_LDFLAGS_$(ARCH))
 
 DTC_FLAGS		+=	-I dts -O dtb
+DTC_CPPFLAGS		+=	-nostdinc -Iinclude -undef -x assembler-with-cpp
 
 ################################################################################
 # Common sources and include directories

make_helpers/build_macros.mk

@@ -464,7 +464,7 @@ $(eval DTBDEP := $(patsubst %.dtb,%.d,$(DOBJ)))
 $(DOBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | fdt_dirs
 	$${ECHO} "  CPP     $$<"
 	$(eval DTBS       := $(addprefix $(1)/,$(call SOURCES_TO_DTBS,$(2))))
-	$$(Q)$$(CPP) $$(CPPFLAGS) -x assembler-with-cpp -MT $(DTBS) -MMD -MF $(DTSDEP) -o $(DPRE) $$<
+	$$(Q)$$(PP) $$(DTC_CPPFLAGS) -MT $(DTBS) -MMD -MF $(DTSDEP) -o $(DPRE) $$<
 	$${ECHO} "  DTC     $$<"
 	$$(Q)$$(DTC) $$(DTC_FLAGS) -i fdts -d $(DTBDEP) -o $$@ $(DPRE)