[Development] Backporting the "stop unloading plugins" change to 5.6

[Konstantin Tokarev]

17.10.2016, 15:48, "Thiago Macieira" <thiago.macieira at intel.com>:
> Em segunda-feira, 17 de outubro de 2016, às 13:32:04 PDT, Giuseppe D'Angelo
> escreveu:
>>  Il 14/10/2016 19:44, Thiago Macieira ha scritto:
>>  >> > We are talking in this change about QFactoryLoader, which is a Qt API
>>  >> > and
>>  >> > which is ALWAYS used until program exit.
>>  >
>>  > I meant internal Qt API.
>>
>>  ... doesn't this sound like a declaration that we're not able to have
>>  internal Qt APIs for Qt plugins that are good enough for having the
>>  plugins clean up after themselves, and be able to be unloaded without
>>  crashing?
>
> Correct.
>
> Sure, it's each plugin's fault -- especially the NM bearer plugin -- but I
> don't have time to figure out everything that's wrong with it. I'd rather apply
> this hammer to the problem than leave applications crashing on exit.
>
>>  Anyhow, I've outlined a plan in my other email.

It may make sense to add generic API for plugin to report if it can be safely dlclosed(), by default everything is unsafe

-- 
Regards,
Konstantin