/usr/bin/gdlpp

cpp: unknown option: --help
Usage: cpp [options] [infile [outfile] ]

The following options are valid:
  -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