prints the name list (symbol table) of each object
is an archive, a listing for each object
file in the archive will be produced.
Each symbol name is preceded by its value (blanks if undefined)
If the symbol is local (non-external) the type letter is in
The output is sorted alphabetically.
Print only global (external) symbols.
Sort numerically rather than alphabetically.
Prepend file or archive element name to each
output line rather than only once.
Don't sort; print in symbol-table order.
Print only undefined symbols.