Makefile questions

I'm working on a project that has to do with the make command in UNIX
to build projects. There are makefiles involved - in fact, a makefile
tree where there subdirectories with their own makefiles which are
called upon by the main makefile (recursive makes). These deal with
C/C++ sources for the most part, but not limited to.


What I need to do is figure out which files in the project are used
for which applications - each build can consist of several
applications. I'll be writing a Perl script (if this is possible) that
basically spits out info about the files used for each application in
the whole build - some files might be shared by more than on
application in a single build.


Is there any possible way from reading the main makefile (root
directory of the project) and extracting this information? I'm on
HP-UX, but I use ClearCase which, in turn, provides clearmake - their
own version of the UNIX make(1). I figured out that by running
clearmake w/ the -w -d and -n options, I get a dry run that gives me
the names of all the directories and files used in the build for the
project, but I still haven't found a way to separate this by
application or executable, IF possible at all.


Thanx for any help I can get!!!
[Sounds like a hard problem. Makefiles can be pretty messy. -John]

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