The build options only control the type of data file that is built. Common data files are first attempted to be loaded from a DLL, then mapped as a single file. DLLs may contain either a single entry point with the same structure as the flat, mappable common file, or per-data entry points as before. It also auto-detects if the data is prepended by a double dummy as generated in the .c files from genccode for alignment control. This is done by gencmn now for Win32.
Some platforms use the ELF format and have a libelf.sl or similar that allows to write such files.
This is done here. Items that are past due are still in the list with their old due date. Complete the Conversion chapter of the ICU user's guide. The chapter iss not ready yet. The chapter is not ready yet.