3 g: symbol table for debugger
4 l: local extensions enabled
5 n: no register messages
6 s: symmetric range for integers: MIN(INTEGER) = -MAX(INTEGER)
8 x: make every name global (for ADB)
9 A: extra array bound checks
10 I: look in directory for definition modules
11 L: no FIL/LIN instructions
12 M: maximum identifier length
14 U: allow underscores in identifiers
15 V: object sizes and alignments
17 3: strict 3rd edition Modula-2
18 -: to pass debugging options
22 i: display number of structures allocated and number of lines read
23 t: run lexical analyzer only
24 C: dump of constant expressions
25 F: display size of every file read.
26 S: define/lookup symbol table access dump