Re: variable parameter list

[Krzysztof Cieniuch]

Warlich, Christof wrote:
> Hi,
>
> consider this makefile:
>
> .PHONY: all
> all: sorted.tgt header.tgt reverse.tgt footer.tgt
> # The lines below are supposed to do this:
> #sorted.tgt: list1.lst list2.lst
> # cat $^ | sort >$@
> #header.tgt: list1.lst list2.lst list3.lst
> # cat $^ | head >$@
> #reverse.tgt: list1.lst
> # cat $^ | tac >$@
> #footer.tgt: list1.lst list2.lst list3.lst list4.lst list5.lst list6.lst 
> list7.lst list8.lst
> # cat $^ | tac >$@
> define FILTER_RULE
> ${2}: ${3} ${4} ${5} ${6} ${7} ${8} ${9} ${10}
>  cat $$^ | ${1} >$$@
> endef
> $(eval $(call FILTER_RULE, sort, sorted.tgt, list1.lst, list2.lst))
> $(eval $(call FILTER_RULE, head -n1, header.tgt, list1.lst, list2.lst, 
> list3.lst))
> $(eval $(call FILTER_RULE, tac, reverse.tgt, list1.lst))
> $(eval $(call FILTER_RULE, tail -n1, footer.tgt, list1.lst, list2.lst, 
> list3.lst, list4.lst, list5.lst, list6.lst, list7.lst, list8.lst))
>
>   
Don't know if that's what you want but the simplest solution would be to 
treat list of files a third parameter instead as separate arguments i.e.

define FILTER_RULE
${2}: ${3}
   cat $$^ | ${1} >$$@
endef

all: sorted.tgt header.tgt reverse.tgt footer.tgt

$(eval $(call FILTER_RULE, sort, sorted.tgt, list1.lst list2.lst))
$(eval $(call FILTER_RULE, head -n1, header.tgt, list1.lst list2.lst 
list3.lst))
$(eval $(call FILTER_RULE, tac, reverse.tgt, list1.lst))
$(eval $(call FILTER_RULE, tail -n1, footer.tgt, list1.lst list2.lst 
list3.lst list4.lst list5.lst list6.lst list7.lst list8.lst))

Note no commas between list*.lst files.

Krzysztof