Qt6 WebEngine: QtWebEngineProcess tries to use system-wide libraries

[Florian Bruhin]

Hi,

On Fri, Aug 27, 2021 at 09:17:14AM +0100, Phil Thompson wrote:
> 
> On 26/08/2021 16:07, Florian Bruhin wrote:
> > Hi again,
> > 
> > When trying to run a simple QtWebEngine script on Arch Linux:
> > https://github.com/qutebrowser/qutebrowser/blob/qt6-test/scripts/testbrowser/testbrowser_webengine.py
> > 
> > I get:
> > 
> > 
> > .../.qt6/lib/python3.9/site-packages/PyQt6/Qt6/libexec/QtWebEngineProcess:
> > error while loading shared libraries: libQt6WebEngineCore.so.6: cannot
> > open shared object file: No such file or directory
> >     [same line repeated]
> >     [1]    222103 trace trap (core dumped)  python3
> > scripts/testbrowser/testbrowser_webengine.py
> > 
> > Looking at ldd, it looks like it's picking up the system-wide libraries
> > only, not the one in the virtualenv:
> > 
> >     $ ldd
> > .../.qt6/lib/python3.9/site-packages/PyQt6/Qt6/libexec/QtWebEngineProcess
> > 
> > .../.qt6/lib/python3.9/site-packages/PyQt6/Qt6/libexec/QtWebEngineProcess:
> > /usr/lib/libQt6Core.so.6: version `Qt_6.2' not found (required by
> > .../.qt6/lib/python3.9/site-packages/PyQt6/Qt6/libexec/QtWebEngineProcess)
> >         [...]
> >         libQt6WebEngineCore.so.6 => not found
> >         [...]
> >         libQt6Core.so.6 => /usr/lib/libQt6Core.so.6 (0x00007f0aa1e62000)
> > 
> > Running with:
> > 
> > LD_LIBRARY_PATH=$PWD/.qt6/lib/python3.9/site-packages/PyQt6/Qt6/lib/
> > 
> > seems to make it work.
> 
> I think this is a Qt bug. If you build the 'minimal' webenginewidgets C++
> example, it won't run either.

Looks like it indeed. I tried with simplebrowser, and I can run it from
Qt Creator, but not outside of it in a terminal.

Reported here: https://bugreports.qt.io/browse/QTBUG-96060

Thanks,
Florian

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