expanding $(%) in prerequisites

[Jacob Burckhardt]

William F. Dowling writes:
> 
> I have definitions and rules like this:
> 
> foo_EXTRAOBJS = $(BIN)/bar.o
> goo_EXTRAOBJS = $(BIN)/baz.o
> 
> $(BIN)/foo : foo.c $(foo_EXTRAOBJS)
>          $(CC) $(CFLAGS) -o $@ foo.c $(foo_EXTRAOBJS)
> $(BIN)/goo : goo.c $(goo_EXTRAOBJS)
>          $(CC) $(CFLAGS) -o $@ goo.c $(goo_EXTRAOBJS)
> 
> Naturally, I'd like to keep my nice declarative style for specifying
> extra objects that need to be linked, while using a pattern rule for
> the build.  I've tried this:
> 
> $(BIN)/% : %.c $(%_EXTRAOBJS)
>        $(CC) $(CFLAGS) -o $@ $< $(*_EXTRAOBJS)
> 
> Although the command seems ok, $(foo_EXTRAOBJS) is not being picked up
> as a prerequisite.  I've tried quite a few other strategems too, but I
> never seem to be able to get the prerequisite to work.
> 
> Can someone suggest a way to make something like this work?

BIN = bin

$(BIN)/foo: $(BIN)/bar.o
$(BIN)/goo: $(BIN)/baz.o $(BIN)/baz2.o

$(BIN)/% : %.c
         $(CC) $(CFLAGS) -o $@ $^

> 
> Please reply to me (address@hidden) as well as the list.
> Many thanks in advance.
> 
> Will
> 
> 
> -- 
> William F. Dowling
> ISI/Thomson Scientific (www.isinet.com)
> 215-386-0100 x-1156
> 
> 
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