QT install and search paths

[Hartmut Goebel <h.goebel@crazy-compilers.com>]

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Hi,

I'm currently working on the build of KDE's plasma-desktop. When
strac-ing the tets, I dicoverd that plaugins are searched in

    /gnu/store/…-qtbase-5.9.1/plugins/…

while most of the KDE program use

    /gnu/store/…-plasma-workspace-5.10.4/lib/plugins/…  (mind the
    additional `lib`)

which is not searched. Wondering why, I found this in qt.scm (qtbase):

           (search-path-specification
            (variable "QT_PLUGIN_PATH")
            (files '("plugins")))

This means that `lib/plugins` is *not* included in QT_PLUGIN_PATH and
thus not searched. (Which I assume is the reason for many test-failures.)

Also in qt.scm (qtbase) there is:

               (substitute* qt_config.prf
                  …
                 (("\\$\\$\\[QT_INSTALL_PLUGINS\\]")
                  "$$replace(dir, mkspecs/modules, plugins)")

I assume this should make the plugins to be in stalled in …/plugins, but
KDE framework is installing into …/lib/plugins.

So I assume this is wrong or there are other places which need to be
adpoted to the changed directory layout.

What do you think?

All of the written above is true for the `qml` directory.

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |


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