Build: add cpp build processing for dtb
This is an add-on feature that allows processing
device tree with external includes.
"-Iinclude" is also added to INCLUDES.
It allows inclusion of dt-bindings files either in dts files or drivers,
as those files will be in include/dt-bindings/.
"-i fdts" is added to the DTC command line.
As the pre-processed files are in build directory, the DT source directory
has to be explicitely included, to manages /include/ directives.
fixes arm-software/tf-issues#595
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index cac9dfc..2a6ded4 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -372,11 +372,14 @@
define MAKE_DTB
$(eval DOBJ := $(addprefix $(1)/,$(call SOURCES_TO_DTBS,$(2))))
+$(eval DPRE := $(addprefix $(1)/,$(patsubst %.dts,%.pre.dts,$(notdir $(2)))))
$(eval DEP := $(patsubst %.dtb,%.d,$(DOBJ)))
$(DOBJ): $(2) $(filter-out %.d,$(MAKEFILE_LIST)) | fdt_dirs
+ @echo " CPP $$<"
+ $$(Q)$$(CPP) $$(CPPFLAGS) -x assembler-with-cpp -o $(DPRE) $$<
@echo " DTC $$<"
- $$(Q)$$(DTC) $$(DTC_FLAGS) -d $(DEP) -o $$@ $$<
+ $$(Q)$$(DTC) $$(DTC_FLAGS) -i fdts -d $(DEP) -o $$@ $(DPRE)
-include $(DEP)