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

[Liang Jian]

    Yes, you are right. After applying the patch from
https://codereview.qt-project.org/#/c/140750/ I didn't notice any leak
report under Windows.
    Sorry for the noise.

    But I am still curious about that If we don't unload the plugin, will
the destructor of the gobal object in it be called? If it is not called,
what if the gobal object of the plugin hold some memory allocated from heap?

On Sat, Oct 15, 2016 at 2:07 AM, Thiago Macieira <thiago.macieira at intel.com>
wrote:

> Em sexta-feira, 14 de outubro de 2016, às 16:08:27 PDT, Liang Jian
> escreveu:
> >     I don't care custom plugin, What I care is the plugins loaded by qt
> > itself, such as qpa plugin, images format plugins ..., These plugins are
> > needed for all qt programs, we can't avoid the leaks caused by not
> > unloading these plugins if my understanding to this issue is right (Maybe
> > you don't think that are leaks but they will confuse memory leak
> detector),
> > that is why I hope to introduce a method to disable this feature at
> runtime.
>
> What do you prefer?
>
> 1) leak
> 2) crash and leak
>
> Either way, the dlclose() call will not happen.
>
> Note that this has nothing to do with freeing memory. Only the dlclose().
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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