9 Using the Dylan IDL Compiler

9.4 Preprocessor options

/preprocess: Runs the preprocessor on the IDL file and displays the result on standard output. The preprocessor output is not compiled.
/define:name[=value]
: Define the macro name. If the optional value is supplied the name is defined to have that value.
/undefine:name
: Undefine the macro name.
/include:dir
: Adds dir to the search path list which the preprocessor uses to find files mentioned in #include directives. More than one /include option may be supplied.