This new tool uses clang libraries to load a module map and then collects all the header files in the module map directory and below (or optionally the set of include directories specified) and checks to see if the module map references all the files in its directory tree, whether explicilty referenced in the module map file, or implicitly covered by an umbrella directory or header. For umbrella headers, it will preprocess the file, using a PPCallbacks derivation to collect any headers included by the umbrella header. If any files are found which are not covered by the module map, the tool displays warning messages.
I would appreciate the usual review feedback regarding the tool doing what it should be doing functionally and the coding.
(Note that I'll be away from Dec 21 - Jan 5 for the holidays, so I won't be able to respond until after I return.)
Thanks, and Merry Christmas!