Dimitry Sibiryakov

How many attempts server needs to realize that the library is not here and will never be?..

> If utility is much wanted to also report progress it's possible via set of callbacks and special OP in remote protocol Can't gfix utility simply use the service instead?

Utilities usually are supposed to work with servers of the same version. Ability to work with servers of different versions is just a nice extra feature.

Check https://github.com/FirebirdSQL/firebird/issues/5384. Most likely it is a lifetime or destructor optimization issue.