# LN_HEADERS       .. if "y", header files are symbolicaly linked instead of copied.
ifneq ($(OMK_VERBOSE),0)
CPHEADER_FLAGS += -v
LNHEADER_FLAGS += -v
endif

ifneq ($(LN_HEADERS),y)
define cp_cmd
( echo "  CP      $(1:$(OUTPUT_DIR)/%=%) -> $(2:$(OUTPUT_DIR)/%=%)"; cp $(CPHEADER_FLAGS) $(1) $(2) )
endef
else
define cp_cmd
( echo "  LN      $(1:$(OUTPUT_DIR)/%=%) -> $(2:$(OUTPUT_DIR)/%=%)"; [ -f $(1) ] || exit 1; ln -sf $(LNHEADER_FLAGS) $(SOURCES_DIR)/$(1) $(2) )
endef
endif

# TODO: Check modification date of changed header files. If it is
# newer that in source dir, show a warning.

# Syntax: $(call include-pass-template,<include dir>,<keyword>)
define include-pass-template
prepare-pass::
	$(Q3)$$(foreach f, $$($(2)_HEADERS), cmp --quiet $$(f) $(1)/$$(notdir $$(f)) \
	   || $$(call cp_cmd,$$(f),$(1)/$$(notdir $$(f))) || exit 1 ; )
	$(Q3)$$(foreach f, $$($(2)_GEN_HEADERS), cmp --quiet TODO_BUILD_DIR/$$(f) $(1)/$$(notdir $$(f)) \
	   || $$(call cp_cmd,TODO_BUILD_DIR/$$(f),$(1)/$$(notdir $$(f))) || exit 1 ; ) # FIXME: Use correct build dir, then document it
	$(Q3)$$(foreach f, $$(nobase_$(2)_HEADERS), cmp --quiet $$(f) $(1)/$$(f) \
	   || ( mkdir -p $(1)/$$(dir $$(f)) && $$(call cp_cmd,$$(f),$(1)/$$(f)) ) || exit 1 ; )
	$(Q3)$$(foreach f, $$(renamed_$(2)_HEADERS), \
	   srcfname=`echo '$$(f)' | sed -e 's/^\(.*\)->.*$$$$/\1/'` ; destfname=`echo '$$(f)' | sed -e 's/^.*->\(.*\)$$$$/\1/'` ; \
	   cmp --quiet $$$${srcfname} $(1)/$$$${destfname} \
	   || ( mkdir -p `dirname $(1)/$$$${destfname}` && $$(call cp_cmd,$$$${srcfname},$(1)/$$$${destfname}) ) || exit 1 ; )
	$(Q3)$$(foreach f, $$(renamed_$(2)_GEN_HEADERS), \
	   srcfname=`echo '$$(f)' | sed -e 's/^\(.*\)->.*$$$$/\1/'` ; destfname=`echo '$$(f)' | sed -e 's/^.*->\(.*\)$$$$/\1/'` ; \
	   cmp --quiet TODO_BUILD_DIR/$$$${srcfname} $(1)/$$$${destfname} \
	   || ( mkdir -p `dirname $(1)/$$$${destfname}` && $$(call cp_cmd,TODO_BUILD_DIR/$$$${srcfname},$(1)/$$$${destfname}) ) || exit 1 ; )
endef

# TODO: *_GEN_HEADERS should be copied by normal rules during build
# phase because they are generated by another rule.