Double default data sizes: use -xtypemap instead.

"-xtypemap=spec"

Allow assignment to constant arguments. 

" -copyargs"

External names--make external names without underscores. 

" -ext_names=e"

Nonstandard arithmetic--allow nonstandard arithmetic. 

"-fnonstd "

Optimize performance for the host system. 

"-native"

Output--use old style list-directed output. 

"-oldldo"

DO loops--use one trip DO loops.

"-onetrip"