-B

No machine specific built-in symbols

-b

Output any parentheses, brace or bracket unbalance

-C

Write source file comments to output

-D

Define a symbol with the given (optional) value "symbol[=value]"

-d

Display all specified options

-E

Ignore non-fatal errors

-F

Output all included file names on stderr

-f

Output all defined functions’ names on stderr

-H

Output all whitespaces from the source file

-h

Output this help text

-I

Add directory to the #include search list

-J

Allow nested comments

-j

Enable warnings for nested comments

-LL

Don’t output #line instructions

-L

Don’t output the ’line’ keyword in "#line" instructions

-M

Don’t warn for missing include files

-N

Don’t predefine target-specific names

-n

Toggle prefs usage

-P

Don’t recognize C++ comment style

-p

Enable warnings on non ANSI preprocessor instructions

-Q

Ignore but visualize undefined flags

-q

Ignore all undefined flags

-R

Evaluate the right part first in symbol concatenations

-s

Include the following string at the top of each function

-S

Specify sizes for #if sizeof

-t

This function should not get an initial function

-U

Undefine symbol

-V

Output version information

-W

Output all #defines

-WWW

Web mode preprocessing

-w

Only output #defines

-X

Include file