Link error in messagelib (QWebEngineUrlRequestInterceptor)

[Kevin Funk]

On Thursday, 21 November 2019 01:08:49 CET David Faure wrote:
> On mardi 19 novembre 2019 14:46:02 CET David Faure wrote:
> > Surely that should bring WebEngineCore into the link.... but apparently it
> > doesn't? Adding -Q -v -Wl,-t to the link line (which is supposed to show
> > all libs being actually used at link time) doesn't show WebEngineCore.
> 
> I think this is a bug in the cmake support in Qt [5.14 git branch].
> 
> My Qt5WebEngineCore/Qt5WebEngineCoreConfig.cmake (attached) doesn't
> mention IMPORTED_LOCATION, unlike all other Config.cmake files generated by
> Qt.
> 
> So, linking to Qt5::WebEngineCore doesn't do anything on my machine.
> 
> Does anyone else see this? Or do you guys all have IMPORTED_LOCATION
> in your [older] versions of Qt5WebEngineCore/Qt5WebEngineCoreConfig.cmake?

I have this code in my other CMake config files. Checked my 5.12 and dev 
build. I don't build qtwebengine myself usually (too big).

>From Qt's Qt5BasicConfig.cmake.in: It's essential to have the 
"_populate_WebEngineCore_target_properties" macro defined and being called in 
the Qt5WebEngineCoreConfig.cmake file.

Looks like this isn't the case for you.

Qt5BasicConfig.cmake.in generates this during the build, using:

...
!!IF !equals(TEMPLATE, aux)
macro(_populate_$${CMAKE_MODULE_NAME}_target_properties Configuration 
LIB_LOCATION IMPLIB_LOCATION
      IsDebugAndRelease)
...

=> Looks like this if condition fails for you(?)

Just some hints; haven't looked deeper into this. From a quick glance I don't 
see super drastic changes in the CMake support in Qt either, which could cause 
something like this.

Regards,
Kevin


> BTW, similar errors happen in kdepim-runtime/resources/ews:
> libewsclient.a(ewsoauth.cpp.o): undefined reference to symbol
> '_ZN26QWebEngineUrlSchemeHandlerD2Ev@@Qt_5'
> /usr/lib/libQt5WebEngineCore.so.5: error adding symbols: DSO missing from
> command line


-- 
Kevin Funk | kevin.funk at kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
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