qt 5.8 raspberry pi plugin load error

Question

i just managed cross compilation using mac os x 10.12 (Sierra) and qt 5.8 for ARM (rasprerry pi). However it would be too easy if i do not encounter any problems. I create a very simple app, configure enviroment to execute it remotely from qt creator however i still got error once i try to execute:

Cannot load library /usr/local/qt5pi/plugins/platforms/libqeglfs.so: (This platform does not support dynamic libraries.)
QLibraryPrivate::loadPlugin failed on "/usr/local/qt5pi/plugins/platforms/libqeglfs.so" : "Cannot load library /usr/local/qt5pi/plugins/platforms/libqeglfs.so: (This platform does not support dynamic libraries.)"
This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc.

Reinstalling the application may fix this problem.
Aborted

looks like plugin is properly loaded:

QT_DEBUG_PLUGINS=1 ./testrpi 
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5pi/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5pi/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/local/qt5pi/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 329728
}

but i think this line explains everything:

QLibraryPrivate::loadPlugin failed on "/usr/local/qt5pi/plugins/platforms/libqeglfs.so" : "Cannot load library /usr/local/qt5pi/plugins/platforms/libqeglfs.so: (This platform does not support dynamic libraries.)"

and now my question is - what does it mean "This platform does not support dynamic libraries". How can i make my app working?

ldd shows that all libs exist, strace never shows open with negative resutlt. Im stuck, so any help appreciated!

Which OS do you have in the RPi? – hyde Dec 12 '16 at 23:11 — hyde, Dec 12 '16 at 23:11

score -1 · Answer 1 · answered Dec 13 '16 at 20:13

-1

Ok problem was in build of qtcorelib, in file qtbase/src/corelib/plugin/qtlibrary_unix.cpp in which flag:

#define QT_NO_DYNAMIC_LIBRARY

was defined and caused all problems. Solution was to do" undef QT_NO_DYNAMIC_LIBRARY just after this define and rebuild qtcore library.

regards J

answered Dec 13 '16 at 20:13

JosiP

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I have the same problem, but your answer doesn't solve it. As far as I can see the file you edited is called "qlibrary_unix.cpp" without the "t". I compiled successfully qtbase with your solution but the problem persists. – Charlie Jun 06 '17 at 19:27

qt 5.8 raspberry pi plugin load error

1 Answers1