User options:
C	while running preprocessor, copy comment
D	see identifier following as a macro
E	run preprocessor only
I	expand include table with directory name following
M	set identifier length
n	don't generate register messages
p	generate linenumbers and filename indications
	while generating EM code
P	in running the preprocessor do not output '# line' lines
R	restricted C
T	take path following as directory for storing temporary file(s)
U	undefine predefined name
V	set objectsize and alignment requirements
w	suppress warning diagnostics


Debug options:

d	perform a small dataflow analysis
f	dump whole identifier table, including macros and reserved words
h	supply hash table statistics
i	print name of include files
m	supply memory allocation statistics
r	right-adjust bitfield
t	dump table of identifiers
u	unstack L_UNIVERSAL
x	dump expressions
