X11 usage in kdeinit/kinit.cpp

[Martin Gräßlin]

Hi,

on my quest to ensure that we can run all applications with -platform wayland 
if compiled with X11 support I stumbled over kinit/kdeinit/kinit.cpp which 
gets compiled into the kdeinit5 binary. To quote the code:

// Can't use QGuiApplication::platformName() here, there is no app instance

And that's kind of a global problem in that file. So I don't see how we can 
make a version for wayland without compiling it twice. Will we still need 
kdeinit5 in the future or is that something which could be killed if we 
improve the startup process (thus ignore the problem)?

A similar problem is present in wrapper.cpp which gets linked into the 
binaries:
* kwrapper5
* kshell5
* kdeinit5_shutdown
* kdeinit5_wrapper

wrapper.cpp assumes there is a DISPLAY env variable and even if not it's set 
to ":0".

Any recommendations?

Cheers
Martin
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