[Interest] QtPlugins statically linked not loading

[Thiago Macieira]

On Monday 01 June 2015 18:37:45 Ulf Hermann wrote:
> On 06/01/2015 06:10 PM, Thiago Macieira wrote:
> > On Monday 01 June 2015 15:01:14 Ulf Hermann wrote:
> >> You probably have to add the following somewhere:
> >> 
> >> LIBS += /path/to/libqmldbg_tcp.a
> > 
> > but like I said, he shouldn't have to. That's a bug in QtQml that it uses
> > qmldbg_tcp without linking to it.
> 
> This is a static build. There is no dynamic linking. The only way to make
> this work would be to build the plugin into QtQml. Actually it used to do
> this, until fac14e459734936320003c3e593481c9cb6079e5 - which explicitly
> avoided it with the following reasoning:

There is no dynamic linking, but there's still need for linking. The commit is 
wrong.

> > commit fac14e459734936320003c3e593481c9cb6079e5
> > Author: Pasi Petäjäjärvi <pasi.petajajarvi at digia.com>
> > Date:   Fri Oct 24 11:31:38 2014 +0300
> > 
> >     Don't embded qmldbg_tcp plugin to libQt5Qml in static build
> >     
> >     Embedding qmldbg_tcp sources to libQt5Qml causes multipled
> >     definitions of QTcpServerConnection symbols with static
> >     build on Qt Quick 2 applications. Qmake can resolve
> >     dependencies to static plugins applications use, so no
> >     need to embed this to libQt5Qml.
> >     
> >     Change-Id: I18c5e44b9ac3de4ef8be29cc5944de3527566b3c
> >     Reviewed-by: Fawzi Mohamed <fawzi.mohamed at theqtcompany.com>
> 
> Now, I really don't know what qmake magic he is referring to here and where
> the multiple definitions came from. Maybe qmake is supposed to
> automatically add libqmldbg_tcp.a to the linker command line.

qmake is not magic. It doesn't know that you need that library.

The commit should be reverted and the original problem (multiple definitions) 
should be fixed properly.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center