patterns

[Jim Gale]

All,

I have a tricky make problem that maybe you can help with.

I have a list of `types' and a list of source files.  For
each type I want to create a new file based on the type and
the source file.

The command for creating the new files looks something like:

        $(COMPILE) <type> $< > $@

where <type> is replaced somehow with one of the tokens in
the TYPES list.

An example is something like:

TYPES = a b
FILES = foo.cpp bar.cpp

would result in 4 files:

foo_a.o
foo_b.o
bar_a.o
bar_b.o

if TYPES was changed to:

TYPES = a b d

I would expect:

foo_a.o
foo_b.o
foo_d.o
bar_a.o
bar_b.o
bar_d.o

I am familiar with normal % patterns, but it seems like I
need multiple patterns here.  If it was possible to have
two patterns in a rule, with the second wild-card being ? and
the corresponding variable being $(*2), I would be able to
make a rule like this:

OFILES = $(foreach type,$(TYPES),$(patsubst %.cpp,%_$(type).o))
$(OFILES): %_?.o: %.cpp
        $(COMPILE) $(*2) $< > $@

But since---as far as I know---this is not possible, what are
my alternatives?

Thanks for your help,
Jim