MAKE for large systems

[Larry Jones]

I've used Make with small programs, but now I'm trying to use it
for a large system with hundreds of files scattered across dozens
of directories and I'm having some trouble figuring out how to
get it to do what I want.

Here's the setup:  I have all the source for a subsystem in SCCS
files in one directory.  I want the current version of all those
files extracted into another directory.  Then, I want all of
those files compiled and added into a library in a third
directory.  It would be great if I could somehow key off the SCCS
files to avoid having to explicitly list all the dependencies in
the Makefile, but I'm willing to do it if I have to.

If all the files were in the same directory, this would be
simple, but the Make inference rules don't seem to deal with
multiple directories (i.e. a dependency like:

	foo.c:  $(SCCSDIR)/s.foo.c

doesn't seem to use the ".c~.c" inference rule to create foo.c).

Any and all suggestions or examples would be greatly
appreciated.
----
Larry Jones                         UUCP: uunet!sdrc!scjones
SDRC                                      scjones at SDRC.UU.NET
2000 Eastman Dr.                    BIX:  ltl
Milford, OH  45150-2789             AT&T: (513) 576-2070
"You can't get a body like mine in a bottle --
unless you push REAL HARD." - Judy Tenuta / Dr. Pepper