617 ################################################################################
 618 # link-file-* works similarly to install-file but creates a symlink instead.
 619 # There are two versions, either creating a relative or an absolute link. Be
 620 # careful when using this on Windows since the symlink created is only valid in
 621 # the unix emulation environment.
 622 define link-file-relative
 623         $(call MakeTargetDir)
 624         $(RM) '$(call DecodeSpace, $@)'
 625         $(LN) -s '$(call DecodeSpace, $(call RelativePath, $<, $(@D)))' '$(call DecodeSpace, $@)'
 626 endef
 627 
 628 define link-file-absolute
 629         $(call MakeTargetDir)
 630         $(RM) '$(call DecodeSpace, $@)'
 631         $(LN) -s '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'
 632 endef
 633 
 634 ################################################################################
 635 # Filter out duplicate sub strings while preserving order. Keeps the first occurance.
 636 uniq = \
 637     $(if $1,$(firstword $1) $(call uniq,$(filter-out $(firstword $1),$1)))
 638 
 639 # Returns all whitespace-separated words in $2 where at least one of the
 640 # whitespace-separated words in $1 is a substring.
 641 containing = \
 642     $(strip \
 643         $(foreach v,$(strip $2),\
 644           $(call uniq,$(foreach p,$(strip $1),$(if $(findstring $p,$v),$v)))))
 645 
 646 # Returns all whitespace-separated words in $2 where none of the
 647 # whitespace-separated words in $1 is a substring.
 648 not-containing = \
 649     $(strip $(filter-out $(call containing,$1,$2),$2))
 650 
 651 # Return a list of all string elements that are duplicated in $1.
 652 dups = \
 653     $(strip $(foreach v, $(sort $1), $(if $(filter-out 1, \
 654         $(words $(filter $v, $1))), $v)))
 655 
 656 # String equals
 657 equals = \

 617 ################################################################################
 618 # link-file-* works similarly to install-file but creates a symlink instead.
 619 # There are two versions, either creating a relative or an absolute link. Be
 620 # careful when using this on Windows since the symlink created is only valid in
 621 # the unix emulation environment.
 622 define link-file-relative
 623         $(call MakeTargetDir)
 624         $(RM) '$(call DecodeSpace, $@)'
 625         $(LN) -s '$(call DecodeSpace, $(call RelativePath, $<, $(@D)))' '$(call DecodeSpace, $@)'
 626 endef
 627 
 628 define link-file-absolute
 629         $(call MakeTargetDir)
 630         $(RM) '$(call DecodeSpace, $@)'
 631         $(LN) -s '$(call DecodeSpace, $<)' '$(call DecodeSpace, $@)'
 632 endef
 633 
 634 ################################################################################
 635 # Filter out duplicate sub strings while preserving order. Keeps the first occurance.
 636 uniq = \
 637     $(strip $(if $1,$(firstword $1) $(call uniq,$(filter-out $(firstword $1),$1))))
 638 
 639 # Returns all whitespace-separated words in $2 where at least one of the
 640 # whitespace-separated words in $1 is a substring.
 641 containing = \
 642     $(strip \
 643         $(foreach v,$(strip $2),\
 644           $(call uniq,$(foreach p,$(strip $1),$(if $(findstring $p,$v),$v)))))
 645 
 646 # Returns all whitespace-separated words in $2 where none of the
 647 # whitespace-separated words in $1 is a substring.
 648 not-containing = \
 649     $(strip $(filter-out $(call containing,$1,$2),$2))
 650 
 651 # Return a list of all string elements that are duplicated in $1.
 652 dups = \
 653     $(strip $(foreach v, $(sort $1), $(if $(filter-out 1, \
 654         $(words $(filter $v, $1))), $v)))
 655 
 656 # String equals
 657 equals = \