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Option:
    Description:

d<name>[=text]
    precompilation #define name [text] (see d<name>[=text])

d+
    allow extended "d" macro definitions on command line (see d+)

fo[=<file_name>]
    set preprocessor output file name (see fo[=<file_name>] (preprocessor))

p{e,l,c,w=<num>}
    preprocess file

    c
        preserve comments

    e
        encrypt identifiers (C++ only)

    l
        insert #line directives

    w=<num>
        wrap output lines at <num> columns.  Zero means no wrap.

    (see p{e,l,c,w=<num>})

u<name>
    undefine macro name (see u<name>)