This program reads each of the source files specified on the command
line, and emits a graph of their interdependencies in the Dot graph
file format. The source files should *not* be qualified with a path,
but instead be inside some directory specified with -I.
Options:
-I
Add to the list of directories to search when
looking for #included files (files which are included
but not found are not printed as dependencies).
-X Exclude module from the graph. If a number is
-X=n specified, at most that many incoming links will be shown.
-S Do not process any outgoing edges from module . This
is useful when is the entry point to a subsystem
whose dependencies are charted separately.
-r Recursively follow dependencies for files encountered.
-q Suppress warnings.
-d Enable debug messages.
-h,-help Print this usage string.