Qt 5.4.1 and Raspberry 2



  • Raspberry Pi foundation started to ship PI2 this morning.

    It's using a BCM2836 chip embedding a Quad Core Cortex A7 processor.

    There is a raspberryPi "profile" to build qt from source on RPI.

    I was wondering if someone (maybe devs) could give some information on how to rebuild Qt 5.4 for RPI2 target ?

    Thanks,

    Lionel.


  • Lifetime Qt Champion

    Hi,

    You should rather ask this question on the "interest":http://lists.qt-project.org/mailman/listinfo/interest mailing list. You'll find there Qt's developers/maintainers (this forum is more user oriented)


  • Moderators

    The hardware is almost the same, and the foundation claims the CPU is compatible. So the instructions for rPi 1 should also work for the new rPi 2.



  • You will want to change the compiler flags in mkspecs/devices/linux-rasp-pi-g++ to get properly optimized code. Everything else, including the EGL/OpenGL integration, should be the same.

    In the future we will need to introduce a new device mkspec for the Pi 2.



  • agocs : i tried this and switched the compilation flags to :

    @-marm -mfpu=neon -mtune=cortex-a7 -march=armv7-a -mabi=aapcs-linux
    @
    The build made it thru. Some qt samples work fine, but i'm encountering issues with the QML webview.

    For some reason it doesnt load at all. I also checked some samples using it like flickrview and the whole app starts fine but the WebView area is desperately black.

    the only log i'm getting from commandline is :

    @QML debugging is enabled. Only use this in a safe environment.
    Failed to start " "QtWebProcess" 15"@

    any clue is welcome :)


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