[Interest] Compiling 5.11.2 on a Pi 3B

[maitai]

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" <jlk2144 at gmail.com>
> TO: interest at 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-request at qt-project.org wrote:   
>> RE: [INTEREST] COMPILING 5.11.2 ON A PI 3B
> _______________________________________________ Interest mailing list Interest at qt-project.org http://lists.qt-project.org/mailman/listinfo/interest 
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