/XREF (Alpha only)
       /XREF[=file-spec]
       /NOXREF (D)

    Controls whether the compiler generates a file of source code
    analysis information. The default file name is the file name of
    the primary source file; the default file type is .XREF. Use the
    SCA IMPORT command to convert an .XREF file into an analysis data
    file that is ready for loading into an SCA library.