[TUTO] Build Qt to cross compile for arm

citiustech · wrote on 8 Mar 2016, 09:49

QOpenglwidget file is included in my application..it is build on qt5.5. but giving file error while make using QT4.8 that QOpenGLWidget no such file.

SGaist · wrote on 8 Mar 2016, 21:53

Hi,

That's because QOpenGLWidget is a new class of Qt 5. Qt 4 has QGLWidget.

citiustech · wrote on 9 Mar 2016, 06:24

Thank for your valueable reply

citiustech · wrote on 9 Mar 2016, 06:34

i am trying to build qt5.5 for arm but getting error while build.
i am using ./configue -xplatform inux-arm-gnueabi-g++ command. it gives openssl error. openssl.h no such file?

can you please suggest

SGaist · wrote on 9 Mar 2016, 08:23

Unless you specified that you want OpenSSL support it should not stop the build. If you want OpenSSL support then you need to provide that dependencies for your target.

citiustech · wrote on 9 Mar 2016, 09:05

DO you have any Build steps like QT4.8.5 for QT5.5?

SGaist · wrote on 9 Mar 2016, 20:47

That usually depends partly on the device you are targeting.

citiustech · wrote on 11 Mar 2016, 10:20

i am cross compiling qt for cubieboard 4.
can you please suggest me ./configure command ?

SGaist · wrote on 11 Mar 2016, 20:34

I don't know this board but a quick search returns this blog entry which step 4 is likely what you are looking for to get started.

citiustech · wrote on 7 Apr 2016, 06:11

Hello. The above solution is working fine for no-opengl.
once opengl es2 enable for cross compile it gives opengl functionality test failed error. i have copied all the GL/GLES2 file from arm board to ubuntu pc and edit qmake.conf file. but it gives the same error.
how to cross compile qt for arm with opengl. can you please suggest?

SGaist · wrote on 7 Apr 2016, 20:36

The headers are not enough, did you also copied the libraries ?

samapollo · wrote on 24 Jun 2016, 12:38

Hello,
I know this is a late reply, but hopefully someone is still reading this thread and active. I followed all the steps, and have everything setup. I compiled the file, but when I try and run the make I get an error saying their is no such file or directory of QGLWidget.
I am looking for assistance as to how I can rectify this problem, and finally get my applications building and running. I have included the terminal log below:

/home/sam/Downloads/qt-everywhere-opensource-src-4.8.5/bin/qmake -spec qt-everywhere-opensource-src-4.8.5/mkspecs/qws/linux-arm-gnueabi-g++ CONFIG+=debug -o Makefile ../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting/2dpainting.pro
/home/sam/Downloads/gcc-linaro-arm-linux-gnueabihf-4.8-2013.10_linux/bin/arm-linux-gnueabihf-g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -Iqt-everywhere-opensource-src-4.8.5/mkspecs/qws/linux-arm-gnueabi-g++ -I../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting -I/usr/local/Qt-4.8.5-arm/include/QtCore -I/usr/local/Qt-4.8.5-arm/include/QtNetwork -I/usr/local/Qt-4.8.5-arm/include/QtGui -I/usr/local/Qt-4.8.5-arm/include/QtOpenGL -I/usr/local/Qt-4.8.5-arm/include -I. -I../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting -I. -o glwidget.o ../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting/glwidget.cpp
In file included from ../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting/glwidget.cpp:41:0:
../Qt5.0.2/5.0.2/gcc/examples/opengl/2dpainting/glwidget.h:44:21: fatal error: QGLWidget: No such file or directory
#include <QGLWidget>

THANKS!!!

SGaist · wrote on 24 Jun 2016, 13:53

Hi and welcome to devnet,

Are you trying to build a Qt 5 example with Qt 4 ?

samapollo · wrote on 24 Jun 2016, 14:55

Yes I am, wow I am an idiot.
If I try to use a qt 4 example should it work?

samapollo · wrote on 24 Jun 2016, 15:07

So I am using the proper example now, it compiles, but when I run the make It says:

make: Nothing to be done for 'first'.

I have attached the entire command and response below:

sam@sam-VirtualBox:~/Downloads$ "/home/sam/Downloads/qt-everywhere-opensource-src-4.8.5/bin/qmake" '/home/sam/classwizard/classwizard.pro' -r CONFIG+=debug -spec /home/sam/Downloads/qt-everywhere-opensource-src-4.8.5/mkspecs/qws/linux-arm-gnueabi-g++
sam@sam-VirtualBox:~/Downloads$ make
make: Nothing to be done for `first'.

SGaist · wrote on 24 Jun 2016, 20:07

Did you cross-compile Qt ? If so did you install it ?

samapollo · wrote on 27 Jun 2016, 08:14

I thought I built it for ARM and it would just run on its own.
Do I need Qt installed on my ARM hardware?
When I move the folder to my ARM hardware I get this error when I try to run it:
./classwizard: undefined symbol: _ZN7QWidget8qwsEventEP8QSEvent

SGaist · wrote on 27 Jun 2016, 09:09

Looks like you cross-compiled your application with Qt 4 and try to run it against Qt 5.

samapollo · wrote on 27 Jun 2016, 11:40

I have Qt 4 on my arm device, but I am still getting the same error. Not sure what to do here?
I have Qt 4 on Raspbian on a Raspberry Pi 3 model B.
Not sure why this error keeps coming up.

SGaist · wrote on 27 Jun 2016, 11:46

Because the Qt 4 you have installed with Raspbian is a standard Qt build for ARM not a Qt for embedded device build.

You have have to cross-compile your Qt 4 again without the embedded option.