Hi Jason
This is my way for compiling qt for RPI 3 or 2, cross compiling from a
Ubuntu virtual machine.
The trick for me is to replace the content of
qtbase/mkspecs/devices/linux-rasp-pi2-g++/qmake.conf with
include(../common/linux_device_pre.conf)
QMAKE_LFLAGS += -Wl,-rpath-link,$$[QT_SYSROOT]/opt/vc/lib
QMAKE_CFLAGS += -march=armv7-a -marm -mthumb-interwork -mfpu=neon-vfpv4
-mtune=cortex-a7 -mabi=aapcs-linux
QMAKE_CXXFLAGS = $$QMAKE_CFLAGS
DISTRO_OPTS += hard-float
QT_QPA_DEFAULT_PLATFORM = xcb
include(../common/linux_arm_device_post.conf)
load(qt_config)
and then:
configure:
./configure -release -no-eglfs -qt-xcb -xcb -nomake tests
-no-use-gold-linker -nomake examples -skip qtscript -skip qtwebengine
-skip qtwayland -skip qtdoc -skip qtlocation -skip qtgamepad -skip
qtspeech -skip qt3d -skip qtwebview -skip qtwebchannel -device
linux-rasp-pi2-g++ -device-option
CROSS_COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-
-sysroot ~/raspi/sysroot -opensource -confirm-license -make libs -prefix
/usr/local/qt5111pi -extprefix ~/raspi/qt5111pi -hostprefix
~/raspi/qt5111 -v
This works for me on Jessie or Stretch, RPI2 or 3, with some other bad
tricks when deploying, that is the idea.
Philippe.
Le 08-11-2018 20:19, Jason H a écrit :
> I really kicked ha hornets nest. Qt5 compiles on Stretch, but it's got
> terrible hardware accleration performance (read: none)
>
> There's no difference for me between xcb and eglfs and glxgears is running at
> 30fps.
>
> $ glxgears -info
> GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.9, 128 bits)
> GL_VERSION = 3.0 Mesa 13.0.6
> GL_VENDOR = VMware, Inc.
>
> ...
> 152 frames in 5.0 seconds = 30.357 FPS
>
> $ qtapp -platform eglfs
> libEGL warning: DRI2: failed to authenticate
> Unable to query physical screen size, defaulting to 100 dpi.
> To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT
> (in millimeters).
> Running on a software rasterizer (LLVMpipe), expect limited performance.
>
> What's the best backend to use for Qt on q RPi 3b?
>
> SENT: Thursday, November 08, 2018 at 8:24 AM
> FROM: "Colin Worth" <jlk2...@gmail.com>
> TO: interest@qt-project.org
> SUBJECT: Re: [Interest] Compiling 5.11.2 on a Pi 3B
>
> I cross-compiled latest Qt 5.10.1 for Raspberry Pi 3B on linux a few months
> ago. Disabled es2 configure (-no-eglfs -no-egl). Stretch supports an
> experimental version of OpenGL for the pi, so platform plugin libxcb is okay.
> This is a good starting point:
> https://www.raspberrypi.org/forums/viewtopic.php?t=204529. In addition the
> configure flags, you can also remove references to egl eglfs from
> qtbase/mkspecs/devices/linux-rasp-pi3-vc4-g++/qmake.conf in the source tree.
> Hope this helps.
>
> Colin
>
>> On Nov 8, 2018, at 7:24 AM, interest-requ...@qt-project.org wrote:
>> RE: [INTEREST] COMPILING 5.11.2 ON A PI 3B
> _______________________________________________ Interest mailing list
> Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
> _______________________________________________
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