Invokes Compaq Fortran preprocessor (modified ANSI C preprocessor)

fpp [options] [source file] [output file]

   If a source file is not specified, input will be read from stdin.  If an
   output file is not specified, output will be sent to stdout.

FPP Options
 /a	Output ANSI-style '#line' directives (instead of UNIX-style '#num'
	    directives)
 /ansi	Full ANSI behavior.  This implies the following:
	    * no #line directives (of any form) are output
	    * no non-whitespace tokens are allowed after #else or #endif
	      directives
	    * comments within "/*" "*/" pairs are not output.  Any characters
	      after the C++ style comment delimiter "\\" are output.
	    * unrecognized preprocessing directives are reported as errors
	    * formal parameters are not recognized within string literals
	      and character constants
	    * trigraphs are replaced everywhere they appear
	    * newlines are not compressed in CPP output
	    * the pushd (UNIX) algorithm is not employed for include file
	      searching
	    * the non-ansi standard system macros are not predefined
	    * the " and \ characters are not escaped within the __FILE__
	      macro expansion
	    * the __STDC__ macro expands to 1
	    * the user-defined directories (given by "-I") are not searched
	      for #include <> directives
	    * UNIX-style #num directives are diagnosed as warnings if found
	    * the '$' character is not allowed within identifiers
 /c	Disallow non-whitespace tokens after #else and #endif directives.
 /B	Output lines starting with C++-style comments "\\".  Default with fpp.
 /C	Output lines within C-style comments.  Default with fpp.

 /Dident
 /Dident=token_seq
 /Dident(parms)
 /Dident(parms)=token_seq
	Macro definition.  These are essentially equivalent to
	    "#define ident 1", "#define ident token_seq",
	    "#define ident(parms) 1", "#define ident(parms) token_seq".

 /e	Reduce the error severity for unrecognized preprocessing directive
	    names.
 /extend_source nn
        Sets max line length.  fpp default is 72
 /f	Ignore formal parameters within strings and character constants
	    within macro bodies.  ("old-style stringization and charization")
 /g	Guard against de-facto token-pasting in the preprocessor
	    output file (by inserting spaces where necessary).
 /h, /? Display this help message
 /i	Do not replace trigraphs within string literals and 
	    character constants.

 /Idir	Define the directories in which the preprocessor searches
            for a file specified in a #include "file" directive.
 /m     Do macro expansion outside of preprocessor lines
 /nologo Don't display the copyright message
 /n	Compress newlines in preprocessor output file.
 /noB   Don't output lines starting with C++ style comments (\\)
 /noC   Don't output lines within C-style comments
 /nom   Don't do macro expansion outside of preprocessor lines (default)
 /p	Search for include files in directory starting in the directory of 
      	    file containing the include (UNIX pushd algorithm), instead of
	    the directory where the original (outermost) source file resides.
 /P	Do not output line control information (#num).
 /Q	Escape " and \ within strings.
 /Sdir	Define the directories in which the preprocessor searches
            for a file specified in a #include <file> directive.
 /temp=dir Specify a temp directory for the preprocessor to use.
 /u	Specify that the user-defined directories (given by "-I")
	    should NOT be searched for #include <> directives.
 /Uident Macro undefinition.  Essentially equivalent to "#undef ident".
 /W	Warn about the use of UNIX-style '#num' directives (which are
	    strictly non-ANSI)
 /z	Do not allow '$' characters within identifiers.