Geoff Chappell - Software Analyst
The required argument consists of whatever follows immediately within the same command-line token, else is the whole of the next command-line token.
This option has no syntactic relations with other options: it does not override any; it is not incompatible with any; it has no prerequisites.
This option names a filter program for the back-end C/C++ compiler. Whatever is named by pathname becomes a filter program for the back-end C/C++ compiler (ordinarily C2.DLL, unless changed by /B2). CL executes the named program instead of C2, but gives it a command line that starts with a pathname for C2 and continues with the command line that would otherwise have been given to C2.