GDB and debug fission

Hello.

For latest gdb to work with -gsplit-dwarf debug information generated by clang, either in split or single mode does it need gdb_index or pubnames?
In normal case where debug information is part of executable gdb_index is nice to speed up startup time, and I think I read pubnames is not used, but with debug fission are either gdb_index or pubnames necessary?


Thank You
Alex