Generates a link map file.
-map [keyword[,...]]
The choices for keyword are:
closure
Calculates the symbol closures.
unused
Lists the unused symbols.
keep
Keeps the link map on failure.
If multiple symbol =.; directives exist for the same symbol in the linker command file, the symbol appears multiple times in the map file. The last entry of a symbol in the map file always has the actual symbol address.
This is a linker option.