Make copy-many-files take an optional destination directory

# Copies many files.

# Copies many files.

# $(1): The files to copy.  Each entry is a ':' separated src:dst pair

# $(1): The files to copy.  Each entry is a ':' separated src:dst pair

# $(2): An optional directory to prepend to the destination

# Evaluates to the list of the dst files (ie suitable for a dependency list)

# Evaluates to the list of the dst files (ie suitable for a dependency list)

define copy-many-files

define copy-many-files

$(foreach f, $(1), $(strip \

$(foreach f, $(1), $(strip \

    $(eval _cmf_tuple := $(subst :, ,$(f))) \

    $(eval _cmf_tuple := $(subst :, ,$(f))) \

    $(eval _cmf_src := $(word 1,$(_cmf_tuple))) \

    $(eval _cmf_src := $(word 1,$(_cmf_tuple))) \

    $(eval _cmf_dest := $(word 2,$(_cmf_tuple))) \

    $(eval _cmf_dest := $(word 2,$(_cmf_tuple))) \

    $(if $(strip $(2)), \

      $(eval _cmf_dest := $(patsubst %/,%,$(strip $(2)))/$(patsubst /%,%,$(_cmf_dest)))) \

    $(if $(filter-out $(_cmf_src), $(_cmf_dest)), \

    $(if $(filter-out $(_cmf_src), $(_cmf_dest)), \

      $(eval $(call copy-one-file,$(_cmf_src),$(_cmf_dest)))) \

      $(eval $(call copy-one-file,$(_cmf_src),$(_cmf_dest)))) \

    $(_cmf_dest)))

    $(_cmf_dest)))