Merge "Make the duplicate header copy warning more explicit"

has_dup_copy_headers :=

$(foreach dest,$(ALL_COPIED_HEADERS), \

    $(eval _srcs := $(ALL_COPIED_HEADERS.$(dest).SRC)) \

    $(eval _src := $(word $(words $(_srcs)),$(_srcs))) \

    $(eval _src := $(lastword $(_srcs))) \

    $(if $(call streq,$(_src),$(_srcs)),, \

        $(warning Duplicate header copy: $(dest)) \

	$(warning Defined in: $(ALL_COPIED_HEADERS.$(dest).MAKEFILE)) \

        $(warning _ Using $(_src)) \

        $(warning __ from $(lastword $(ALL_COPIED_HEADERS.$(dest).MAKEFILE))) \

        $(eval _makefiles := $$(wordlist 1,$(call int_subtract,$(words $(ALL_COPIED_HEADERS.$(dest).MAKEFILE)),1),$$(ALL_COPIED_HEADERS.$$(dest).MAKEFILE))) \

        $(foreach src,$(wordlist 1,$(call int_subtract,$(words $(_srcs)),1),$(_srcs)), \

            $(warning _ Ignoring $(src)) \

            $(warning __ from $(firstword $(_makefiles))) \

            $(eval _makefiles := $$(wordlist 2,9999,$$(_makefiles)))) \

        $(eval has_dup_copy_headers := true)) \

    $(eval $(call copy-one-header,$(_src),$(dest))))

all_copied_headers: $(ALL_COPIED_HEADERS)