Cross compile Qt (Windows) to Raspberry 3

etiennedm

Hi,
I've been looking for informations on how to configure the cross compilation on qt (windows) for the raspberry 3. I don't know if it's the place to write it, but for people who are interested in, here is how I did the cross compilation beetwee windows 8 and raspberry pi 3 (debian jessie).

Most of steps come from the tuto here : http://visualgdb.com/tutorials/raspberry/qt/embedded/
Based on that, here are the changes I made to make it work for the rpi3 :

Open this : http://visualgdb.com/tutorials/raspberry/qt/embedded/
Follow STEP 2.
WARNING : For step 3, you need to change MinGW32 with MinGW64 with gcc >= 4.9. So download it, and install it in C:/SysGCC/MinGW64
Follow step 4.
For step 5., download qt-everywhere >= 5.6 (otherwise rpi3 won't be supported)
Follow step 6.
From here, all the cmd line on the terminal must be done on msys2 MinGW64 !
Download MSYS2, install it in C:/SysGCC/MinGW64/msys2
Open mingw64_shell
Run those cmd to update the needed libs :
```
 	pacman -S make
 	pacman -S perl
 	pacman -S pkg-config
 	pacman -S diffutils
```
Continue the tuto with this shell
Follow step 8.
Step 9 : check that gcc is linked to MinGW64/bin/gcc.exe
Follow 10. and 11.
For step 12, change "linux-rasp-pi2-g++" to "linux-rpi3-g++"
PS : you can add the "-nomake examples" in the configure cmd lines if you don't need them to save time
PS2 : opengl and libxcb may have some link troubles, I removed them, I use linuxfb
Follow 13-14-15

Follow step 16
Ex : In my case, the cmd was :

../qt-everywhere-opensource-src-5.6.1/configure -platform win32-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-rpi3-g++ -sysroot C:/SysGCC_RPi3/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -device-option CROSS_COMPILE=C:/SysGCC_RPi3/Raspberry/bin/arm-linux-gnueabihf- -nomake examples -opensource -confirm-license

Now, if you're configuration file has been well generated, launch "make && make install" (step 17.)
Copy the built qt from C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot/usr/local/qt5 to your pi3 in /usr/local/qt5 (step 18 - end)

There should be different ways to make it work, maybe this is not the best one, but it works for me. Hope it's helpful, sorry if i'ts not the place.

Etienne

grzwolf

All fine until step 13.

Excuting the following command:

../qt-everywhere-opensource-src-5.6.1/configure -platform win32-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-rpi3-g++ -sysroot F:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -device-option CROSS_COMPILE=F:/SysGCC/Raspberry/bin/arm-linux-gnueabihf- -nomake examples -opensource -confirm-license -qt-xcb -v

generates a lot of error messages like:
... arm-linux-gnueabihf-g++.exe: error: unrecognized command line option '-std=c++1z' ...

Any advise?

======================================================
Update:

I finally gave up on cross compile
installed QT/Creator on pi3 (actually the build time for what I'm doing is not too bad)
vnc access from PC is ok

Hannu

Hi,

I'm trying to install QT5.7 environment with Raspberry PI3 support. I'm using MINGW64 and QT-everywhere 5.7.0. For some reason 5.7.0 requires c++11, which my env doesn't have. Step 16 will fail for that. QT 5.6.1 is fine with c++, but is having problems OpenGL ES 2.0.

Would be great if some guru would update instructions for RPI3.

Thanks in advance.

Br,
Hannu

==============================

edit:

When merged linux-arm-gnueabi-g++\qmake.conf from QT-everywhere 5.7.0 to 5.6.1 OpenGL problem was solved.
"pacman -S python" was also needed for make

pVit · Follow 13-14-15

@etiennedm
Silly question but what advantages are in this solution special for RPi3 when tutorial by sysprogs itself is useable on RPi3?

Garyio

@pVit Can you tell us how you got the tutorial by sysprogs to work? I think most people are having problems getting it to work.

pVit

@Garyio
What problem do you have? I did everything in tutorial, used mingw32-gcc 4.7.2, python 2.7.11 and raspberry-gcc 4.6.3 and everything is okay.

small_bird

@Hannu Hi, you said Qt5.6.1 has problems with opengl es? What is the problem ?

lygstate

Where to download MINGW64 gcc 4.9.2

jsulm

@lygstate The easiest way is to use Qt Maintenance Tool if you used Qt Online Installer to install Qt.
Also, how is your question related to this thread?

lygstate

How to exclude qtscript from build?

lygstate

If the steps is not appear, then following the steps in https://visualgdb.com/tutorials/raspberry/qt/embedded/, otherwise using the steps below instead

Step 3: Download gcc 4.9.2 for Windows
https://wiki.qt.io/MinGW
https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/tools_mingw/
The download URL is
https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/tools_mingw/qt.tools.win32_mingw492/4.9.2-1i686-4.9.2-release-posix-dwarf-rt_v3-rev1.7z
extract as C:/SysGCC/mingw32
gcc would placed at C:/SysGCC/mingw32/bin/gcc.exe
Step 5: Download Qt 5.8.0/Qt 5.6.1 source
and extract as
C:\SysGCC\qt-everywhere-opensource-src-5.8.0
There is path C:\SysGCC\qt-everywhere-opensource-src-5.8.0\qtbase

Step 6: Sync sysroot

/lib
/usr/include
/usr/lib
/usr/local/include
/usr/local/lib
/opt

/opt/vc

Step 7: Install MSYS2
Download newest msys2 from http://www.msys2.org/
http://repo.msys2.org/distrib/x86_64/msys2-x86_64-20161025.exe
Install it.
open msys2/mingw32.exe
```
pacman -S make perl pkg-config diffutils
```
Close the shell

Steop 8: Edit ~/.bashrc
Append following lines

export PATH=$PATH:/c/SysGCC/mingw32/bin
export PATH=$PATH:/c/Python27
export PATH=$PATH:/c/SysGCC/Raspberry/bin
mkdir -p /c/SysGCC/qt-build
cd /c/SysGCC/qt-build

open msys2/mingw32.exe

Step 9: Check that gcc is linked to C:/SysGCC/mingw32/bin/gcc.exe
Step10: Prepare the source code
Copy folder qt-everywhere-opensource-src-5.8.0\qtbase\mkspecs\linux-arm-gnueabi-g++\
and it's contents as
qt-everywhere-opensource-src-5.8.0\qtbase\mkspecs\linux-arm-gnueabihf-g++\
in folder qt-everywhere-opensource-src-5.8.0\qtbase\mkspecs\linux-arm-gnueabihf-g++\
grep -irn arm-linux-gnueabi- arm-linux-gnueabihf- .

Edit qt-everywhere-opensource-src-5.8.0\qtbase\mkspecs\devices\linux-rpi3-g++\qmake.conf
Replace part lines with (This should also works for Qt 5.6.1, not tested for OpenGL ES):
```
VC_LIBRARY_PATH         = $$[QT_SYSROOT]/opt/vc/lib
VC_INCLUDE_PATH         = $$[QT_SYSROOT]/opt/vc/include

QMAKE_LFLAGS           += -L$${VC_LIBRARY_PATH}

VC_LINK_LINE            = -L$${VC_LIBRARY_PATH}
```

Step 12: Configure for Host & Target(Only Qt 5.8 and upper, Qt 5.7 not tested)
For Qt 5.8 Host & Target
No step 16, results are in step 16.

../qt-everywhere-opensource-src-5.8.0/configure -skip qtscript -platform win32-g++ -xplatform linux-arm-gnueabihf-g++ -release -device linux-rpi3-g++ -sysroot C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -device-option CROSS_COMPILE=C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf- -nomake examples -opensource -confirm-license

For Qt 5.6 and lower, Only Host

../qt-everywhere-opensource-src-5.6.1/configure -skip qtscript -platform win32-g++ -xplatform linux-arm-gnueabihf-g++ -release -device linux-rpi3-g++ -sysroot C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -opensource -confirm-license

Step13: Skip
Step 14: This is normal as long as qmake.exe got built. Check this by running qtbase/bin/qmake -v
Step 15: Skip

Step 16: Configure the Target (Only Qt 5.6 and lower), otherwise Skip it
Remove -std=c++1z from qt-everywhere-opensource-src-5.6.1\qtbase\mkspecs\devices\linux-rpi3-g++\qmake.conf
Qt 5.6.x execute the following command

../qt-everywhere-opensource-src-5.6.1/configure -skip qtscript -platform win32-g++ -xplatform linux-arm-gnueabihf-g++ -release -device linux-rpi3-g++ -sysroot C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -device-option CROSS_COMPILE=C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf- -nomake examples -opensource -confirm-license

Step 17: Building And Install
```
make && make install
```

jsulm

@lygstate Pass this to configure:

-skip qtscript

lygstate

@jsulm Thanks, I am using this method.

CrazyCreepy

I do all the tuto and i can make a excutable with qt but the qlabel and the qpushbutton it isn't show. i think it's because when create the qmake the modul gtk isn't enable. when i try to enable it that said

ERROR: Feature 'gtk3' was enabled, but the pre-condition 'features.glib && libs.gtk3' failed.

it's do 1 week i try to fine how to fix the pre-condition.

jsulm

@CrazyCreepy "qlabel and the qpushbutton it isn't show" - what does it mean? Are they not shown at all, or no text?
For gtk3 support you probably need to install gtk3 dev packages, but it actually should work without.
If there is no text then you probably have some font issues.

CrazyCreepy

@jsulm I mean the label and push button doesn't exist! if i wants to close my windows i will use httop... it work without gtk3 but not all feature is enable and this can be very problematic later... and i installe Gtk3 on my rasp, but they change noting i need to configure in my compiler but i don't know how .

jsulm

@CrazyCreepy As I said you need to install gtk3/glib dev packages on your RPi/sysroot and then build Qt (there is nothing to configure in compiler).
"label and push button doesn't exist" - you probably mean - they are not shown?

CrazyCreepy

that what i get on my raspberry pi
alt text
and that was i get

I have already install the glib and gtk3 on my raspberry... I also try to syncronize all of my raspberry pi with smartputty in my sysroot and it's doesn't work... I'm little exhausted of this.... thanks for help.

pinballsp

Hello.

Very good instructions to config QT5 for RPY3 with cross. I try to install but fail in step6, seem some permissions problem, but do not know why, I work with Administrator user, and I have change permissions to all files to get access to all users.

This is capture screen about fail when I try to run step 6 to syncronize sysroot. Somebody may help me, why fail ??. Translation to english language about the error message is "Cannot connect: Try to access to one socket not allowed because your access permissions 192.168.1.7"

If I run directly StmarTTY from Windows work perfectly, but I run SmarTTY from a DOS window also fail with same error message,

alt text

pinballsp

.

Hello.

My before problem was because the firewall, already solved. I have follow instructions of lystate user, and all seem ok but fail in last step, with this error message.

Somebody know how to solve this problem to may compile ??

alt text

.

And this is the content of the config.log file:

executing config test use_gold_linker
cd C:\SysGCC\qt-build\qtbase\config.tests && C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf-g++ -fuse-ld=gold -o conftest-out conftest.cpp
cc1plus.exe: error: unrecognized command line option '-fuse-ld=gold'

test config.qtbase.tests.use_gold_linker FAILED
executing config test verifyspec

cd C:\SysGCC\qt-build\qtbase\config.tests\common\verifyspec && C:\SysGCC\qt-build\qtbase\bin\qmake.exe -qtconf C:/SysGCC/qt-build/qtbase/bin/qt.conf "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared console" "QMAKE_CFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" "QMAKE_CXXFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" "QMAKE_LFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec

cd C:\SysGCC\qt-build\qtbase\config.tests\common\verifyspec && set MAKEFLAGS=& C:/SysGCC/msys2/usr/bin/make

C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf-g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -O2 -Wall -W -fPIC -IC:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec -I. -IC:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o verifyspec.obj C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec/verifyspec.cpp

cc1plus.exe: error: bad value (armv8-a) for -march switch
cc1plus.exe: error: bad value (cortex-a53) for -mtune switch

C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec/verifyspec.cpp:1:0: error: invalid floating point option: -mfpu=crypto-neon-fp-armv8
make: *** [Makefile:176: verifyspec.obj] Error 1
executing config test verifyspec

cd C:\SysGCC\qt-build\qtbase\config.tests\common\verifyspec && C:\SysGCC\qt-build\qtbase\bin\qmake.exe -qtconf C:/SysGCC/qt-build/qtbase/bin/qt.conf "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared console" "QMAKE_CFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" "QMAKE_CXXFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" "QMAKE_LFLAGS += --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot" C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec

cd C:\SysGCC\qt-build\qtbase\config.tests\common\verifyspec && set MAKEFLAGS=&

C:/SysGCC/msys2/usr/bin/make clean && set MAKEFLAGS=& C:/SysGCC/msys2/usr/bin/make
rm -f verifyspec.obj
rm -f *~ core *.core

C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf-g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=C:/SysGCC/Raspberry/arm-linux-gnueabihf/sysroot -O2 -Wall -W -fPIC -IC:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec -I. -IC:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o verifyspec.obj C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec/verifyspec.cpp

cc1plus.exe: error: bad value (armv8-a) for -march switch
cc1plus.exe: error: bad value (cortex-a53) for -mtune switch

C:/SysGCC/qt-everywhere-opensource-src-5.8.0/qtbase/config.tests/common/verifyspec/verifyspec.cpp:1:0: error: invalid floating point option: -mfpu=crypto-neon-fp-armv8

make: *** [Makefile:176: verifyspec.obj] Error 1