Cross Referencing

The cross referencing is performed for the following items

Files
#includes
Variables
Functions
Each of these items is cross referenced in the output.

The cross referencing uses files `cxref.variable', `cxref.function', `cxref.include' and `cxref.typedef' in the output directory.

These are a complete list of the function and variable usage in the program and could be used to generate a function call hierarchy or variable usage diagram for example.

Two cxref passes of each file is needed, the first to build up the cross referencing files and the second to use them.

(The file names are different if the ``-N'' option is used.)