The definition file is the last file needed to build the DLL. It lists
the exported symbols. As an example, the definition file for a DLL
containing only package API (where all the entities are exported
with a C calling convention) is:
EXPORTS count factorial finalize_api initialize_api
If the C calling convention is missing from package API,
then the definition file contains the mangled Ada names of the above
entities, which in this case are:
EXPORTS api__count api__factorial api__finalize_api api__initialize_api