`.scl CLASS'
============
Set the storage-class value for a symbol. This directive may only be
used inside a `.def'/`.endef' pair. Storage class may flag whether a
symbol is static or external, or it may record further symbolic
debugging information.
The `.scl' directive is primarily associated with COFF output; when
configured to generate `b.out' output format, `as' accepts this
directive but ignores it.