Deferred targets or second expansion? (rename results from split)

[Peng Yu]

My problem is that I have a number of files to be splitted. Then I
want to add a suffix to each file.

According to the manual, targets are always immediate. I think that
probably secondexpansion may help in this case. But I'm not clear how
to apply it to my case below. Would you please show me?


$ ll -go *
-rw------- 1 478 2010-06-15 22:43 Makefile

txt:
total 8
-rw------- 1 3893 2010-06-15 22:26 aaa.txt
-rw------- 1 3893 2010-06-15 22:26 bbb.txt

$ cat Makefile
.PHONY: all clear
.NOTPARALLEL: all

TXT:=$(wildcard txt/*_sequence.txt)
PREFIX:=$(patsubst txt/%.txt,output/%,$(TXT))

ALL_SPLIT_FILES=$(wildcard output/*/*)
RENAME_ALL_SPLIT_FILES=$(patsubst %,%.txt,$(ALL_SPLIT_FILES))

all: ; $(RENAME_ALL_SPLIT_FILES)

.SECONDEXPANSION:
$$(RENAME_ALL_SPLIT_FILES): %.txt: %
        mv $< $@

$(RENAME_ALL_SPLIT_FILES): split

split: $(PREFIX)

$(PREFIX): output/%: txt/%.txt
        mkdir -p $@; split --lines 100 --numeric-suffixes $< $@/; touch .

clean:
        $(RM) -r output

-- 
Regards,
Peng