[[!meta  title="More make idoms"]]
[[!meta  date="2008-08-31 20:27:09"]]
I'm rather proud of this one (can you tell I'm overhauling sawsim's
Makefile ;).

    $ cat Makefile
    FILES = a b
    DS = src
    DT = targ

    all : $(FILES:%=$(DT)/%)
            @echo "got $^"
            @echo "done"

    clean :
            rm -rf $(DT)

    .SECONDEXPANSION:
    #$(FILES:%=$(DT)/%) : $$($$@:$(DT)/%=$(DS)/%) $(DT)
    #              This colon --^ produces: "target pattern contains no `%'."
    # Instead use this idom --v
    $(FILES:%=$(DT)/%) : $$(subst $(DT),$(DS),$$@) $(DT)
            @echo "looking for $< for $@"

    $(DT) :
            mkdir $@
    % :
            @echo "missing rule for $@"

    $ make
    looking for src/a for targ/a
    looking for src/b for targ/b
    got targ/a targ/b
    done

Of course you could accomplish the same effect with

   $(DT)/% : $(SRC)/%
           @echo "looking for $< for %@"

but what fun is that? ;)

[[!tag tags/programming]]