Seeking C Function Xref Tools (Unix)

[Rick Clark]

I am looking for tools that will produce a function cross reference for a
multi-file C program.  By function cross reference, I mean a report that lists
for each function the functions that it calls and the functions that call it,
with line numbers.  It would be preferable if the tool could handle source 
spread over multiple directories.

I will consider proprietary and public-domain packages.  We are running 4.3 on
VAXes and SunOS 4.0.  

Please send e-mail.  I will summarize.

Thanks in advance,

        Richard Clark
        rickc at ttidca.tti.com

        Transaction Technology Corp.
        3100 Ocean Park Blvd.
        Santa Monica, CA 90405
        (213) 450-9111  X-2442