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This tutorial shows how to cross-compile the Embedded build of Qt 5.5 for Raspberry Pi 2. The Embedded build does not use the X11 server and instead displays the GUI directly using the Raspberry Pi framebuffer. We will show how to use a Raspberry Pi cross-compiler to build the Qt5 framework for Raspberry Pi on a Windows machine. Download a fresh SD card image for your Raspberry Pi.
In this tutorial we will use a image. Write the image into the SD card using or any other similar tool. Download a matching the image and install it:.
Download and install a that will be used to build Windows versions of build tools like Qmake:. Download and install and ensure that its directory is added to PATH. Download the Qt source package (e.g. Before we can build the Qt for Raspberry Pi, we need to resynchronize the sysroot with the toolchain to ensure that the toolchain has all the headers and libraries from your Raspberry.
Start the UpdateSysroot.bat file from the Raspberry TOOLS folder:You need to synchronize at least the /opt folder, as it contains OpenGL headers that are not included in the toolchain. If you have installed additional packages on your Raspberry Pi, resynchronize other suggested directories as well. Do not resynchronize the /etc folder. Otherwise it will overwrite the /etc/ld.so.conf file with a version from the device that contains “include” statements unsupported by the Windows compiler. If you did overwrite it, expand the statements manually or revert to the ld.so.conf file shipped with the original toolchain. Launch the msys shell from the MinGW toolchain by running MinGW32 msys 1.0 msys.bat:. Go to the directory containing the archive with the Qt source and extract it by running tar xf:.
Ensure that the directories containing the MinGW gcc compiler and the Raspberry Pi cross-compiler are added to PATH. If not, add them manually:.
Open the qt-everywhere-opensource-src-5.5.0 qtbase mkspecs linux-arm-gnueabi-g qmake.conf file and replace all occurences of arm-linux-gnueabi- with arm-linux-gnueabihf-:. Now we are ready to build Qt. Due to a bug in the Qmake build script, we will need to build it in 2 steps: first we will build a Qmake for Windows and then we’ll build the actual Qt binaries.
First we will modify the win32-g platform definition to prevent MinGW from excluding some functions that Qt relies upon. Open the qt-everywhere-opensource-src-5.5.0 qtbase mkspecs win32-g qmake.conf file and add -USTRICTANSI to CXXFLAGS:. Now we can build the Windows tools.
Create a directory (e.g. Qt-build) and run the configuration script from there. / qt - everywhere - opensource - src - 5.5.0 / configure - platform win32 - g - xplatform linux - arm - gnueabi - g - release - opengl es2 - device linux - rasp - pi2 - g - sysroot C: / SysGCC / Raspberry / arm - linux - gnueabihf / sysroot - prefix / usr / local / qt5 Note the “-opengl es2” option that configures Qt to use the Raspberry Pi framebuffer directly instead of the X11 system.
Eventually the build should fail complaining about the errors to process specs for the raspberry device:. This is normal as long as qmake.exe got built.
Check this by running “qtbase/bin/qmake -v”:. Now we can build the rest of the Qt framework.
First of all open the qtbase configure file and replace the condition before the “Creating qmake line” with this one. / usr / local / lib. Your toolchain sysroot directory contains the /opt/vc directory If nothing helps, run the configure script with the -verbose argument and direct its output to a file by appending “ log.txt 2&1” to the command line. This should provide more information on what exactly is causing the problem. Once the configure script reports that the configuration is complete, run the “make && make install” command to build the entire Qt framework and install it into the cross-compiler directory. The framework is huge, so the build process might take several hours to complete, even on a fast machine.Warning: do not run “make install” before “make” succeeds as it would fail leaving the build directory in a partially built state failing further builds until the entire directory is deleted and re-created. Open SmarTTY (a portable version can be found in Raspberry TOOLS PortableSmartty) and connect to your Raspberry Pi.
Then run the following commands to create the /usr/local/qt5 folder and make it writable to the current user. Sudo chown pi qt5 Then select SCP-Upload directory:. Select the usr local qt5 directory and upload it to /usr/local/qt5:. Wait for the upload to complete. The built Qt framework is relatively large and would take several minutes to upload:.
Once the upload is complete, you can test out the framework. Go to the /usr/local/qt5/examples/opengl/qopenglwidget directory and launch./qopenglwidget:.
Look at the screen connected to the HDMI port of the Raspberry Pi. You will see a rotating Qt logo animation: If the screen does not show anything, shut down your Raspberry Pi and re-plug the power connector. As long as the screen is connected when the device is powered on, Raspberry Pi should recognize it. Best svn client for mac. Now that you have cross-compiled the Qt framework for your Raspberry, follow to create and build a basic Qt application using the same cross-compiler.