Qt 5.11 for Beaglebone Black

sierdzio

I'd say your sysroot is bad. It is building against a newer version of GLIBC than your target board contains.

I recommend using the sysroot directly from your BBB. See, for example, how this wiki does it: https://wiki.qt.io/RaspberryPi2EGLFS

shylock

Hello Sierdzio,

I was replicating I mean following the URL for BBB build procedure from following.
https://wiki.qt.io/BeagleBone_Black_Beginners_Guide
I replicated to its every line as advised.
This simply reflects that the information furnished on this wiki page either incorrect or outdated.
I am beginning to suspect that the compiler I used from Linaro i.e linux-arm-linaro-7.2.1-gnueabihf (hard float) is a culprit? As I have to modify least two files as follow:

a) ..qtbase/mkspecs/devices/linux-beagleboard-g++/qmake/qmake.conf

#COMPILER_FLAGS      = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb
COMPILER_FLAGS       = -mfloat-abi=hard

AND ...
b) qtbase/mkspecs/linux-arm-gnueabi-g++/qmake.conf

# modifications to g++.conf
QMAKE_CC                = arm-linux-gnueabihf-gcc
QMAKE_CXX               = arm-linux-gnueabihf-g++
QMAKE_LINK              = arm-linux-gnueabihf-g++
QMAKE_LINK_SHLIB        = arm-linux-gnueabihf-g++
# modifications to linux.conf
QMAKE_AR                        = arm-linux-gnueabihf-ar cqs
QMAKE_OBJCOPY           = arm-linux-gnueabihf-objcopy
QMAKE_NM                     = arm-linux-gnueabihf-nm -P
QMAKE_STRIP                = arm-linux-gnueabihf-strip

for an inclusion of compiler correct syntax for make.

I wonder what is your comment on this?
You mentioned 'sysroot is bad it is building against a newer version of GLIBC that your target board contains.'

I build target board BBB kernel with latest version 4.15.0-bone2.1 from
git clone https://github.com/RobertCNelson/bb-kernel

Thank you,

sierdzio

@shylock said in Qt 5.11 for Beaglebone Black:

I am beginning to suspect that the compiler I used from Linaro i.e linux-arm-linaro-7.2.1-gnueabihf (hard float) is a culprit?

Well, you can either downgrade the toolchain or upgrade the sysroot ;-) Your choice. Or indeed some config is off but I doubt it.

I build target board BBB kernel with latest version 4.15.0-bone2.1 from

This is irrelevant. You get the GLIBC error because your binary was compiled using higher GLIBC version than your BBB has - and thus the ABI does not match.

This simply reflects that the information furnished on this wiki page either incorrect or outdated.

It's outdated, yes. But also, you are not following it closely if you compile with GCC 7.2 while the wiki mentions 4.9 ;-) Once you resolve the problems you're having, please consider updating the wiki.

I think the GCC is too new for given OS image (Debian Jessie is an old beast).

shylock

Hi Sierdzio,

Since your last post, I changed the arm toolchain currently I am using gcc-linaro-4.9/bin/arm-linux-gnueabi-*
to compile and my configure line read as follow:
./configure -v -opensource -confirm-license -prefix /usr/local/qt5.11 -device linux-beagleboard-g++ -device-option CROSS_COMPILE=$HOME/gcc-linaro-4.9/bin/arm-linux-gnueabi- -qt-libpng -qt-libjpeg -release -qpa eglfs -opengl es2 -no-gcc-sysroot

But I am consistently getting following an error message:
================ Error ================
This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Checking for gold linker...

cd /qt5/qtbase/config.tests && /gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -fuse-ld=gold -o conftest-out conftest.cpp

collect2: fatal error: cannot find 'ld'
compilation terminated.
test config.qtbase.tests.use_gold_linker FAILED
Checking for machine tuple...

/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -dumpmachine

arm-linux-gnueabi
test config.qtbase.tests.machineTuple succeeded
Checking for valid makespec...

/qt5/qtbase/config.tests/verifyspec && qt5/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" -early "CONFIG += cross_compile" /qt5/qtbase/config.tests/verifyspec

Info: creating stash file /qt5/qtbase/config.tests/.qmake.stash

/qt5/qtbase/config.tests/verifyspec && MAKEFLAGS= /usr/bin/make

/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -c -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -mfloat-abi=hard -O2 -O3 -std=gnu++11 -w -fPIC -I. -I/qt5/qtbase/mkspecs/devices/linux-beagleboard-g++ -o verifyspec.o verifyspec.cpp
/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -mfloat-abi=hard -Wl,-O1 -o verifyspec verifyspec.o -lrt -lpthread -ldl
/gcc-linaro-4.9/bin/../lib/gcc/arm-linux-gnueabi/4.9.3/../../../../arm-linux-gnueabi/bin/ld: error: verifyspec.o uses VFP register arguments, verifyspec does not
/gcc-linaro-4.9/bin/../lib/gcc/arm-linux-gnueabi/4.9.3/../../../../arm-linux-gnueabi/bin/ld: failed to merge target specific data of file verifyspec.o
collect2: error: ld returned 1 exit status
Makefile:66: recipe for target 'verifyspec' failed
make: *** [verifyspec] Error 1
Note: Also available for Linux: linux-clang linux-icc

ERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.

Complete new cloned qt repo.
By the look of the ld (linker) not found but linker exists in gcc-linaro-4.9/bin directory.

I looked in qtbase/mkspac/devices/linux-beagleboard-g++/qmake.conf as follow:

qmake configuration for the BeagleBoard and BeagleBoard xM boards

http://beagleboard.org/

MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib

include(../../common/linux.conf)
include(../../common/gcc-base-unix.conf)
include(../../common/g++-unix.conf)

load(device_config)

QT_QPA_DEFAULT_PLATFORM = eglfs

modifications to g++.conf

QMAKE_CC = $${CROSS_COMPILE}gcc
QMAKE_CXX = $${CROSS_COMPILE}g++
QMAKE_LINK = $${QMAKE_CXX}
QMAKE_LINK_SHLIB = $${QMAKE_CXX}

modifications to linux.conf

QMAKE_AR = $${CROSS_COMPILE}ar cqs
QMAKE_OBJCOPY = $${CROSS_COMPILE}objcopy
QMAKE_NM = $${CROSS_COMPILE}nm -P
QMAKE_STRIP = $${CROSS_COMPILE}strip

COMPILER_FLAGS = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb

#modifications to gcc-base.conf
QMAKE_CFLAGS += $${COMPILER_FLAGS}
QMAKE_CXXFLAGS += $${COMPILER_FLAGS}
QMAKE_CXXFLAGS_RELEASE += -O3

QMAKE_LIBS += -lrt -lpthread -ldl

Extra stuff (OpenGL, DirectFB, ...)

QMAKE_INCDIR_EGL =
QMAKE_LIBDIR_EGL =
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_LIBDIR_OPENGL_ES2 = $${QMAKE_LIBDIR_EGL}
QMAKE_INCDIR_OPENVG = $${QMAKE_INCDIR_EGL}
QMAKE_LIBDIR_OPENVG = $${QMAKE_LIBDIR_EGL}

QMAKE_LIBS_EGL = -lEGL -lIMGegl -lsrv_um
QMAKE_LIBS_OPENGL_ES2 = -lGLESv2 $${QMAKE_LIBS_EGL}
QMAKE_LIBS_OPENVG = -lOpenVG $${QMAKE_LIBS_EGL}

DISTRO_OPTS += hard-float

No need for any special EGL device integration.

Prioritize the default, compiled-in integration over any plugins.

EGLFS_DEVICE_INTEGRATION = none

include(../common/linux_arm_device_post.conf)

load(qt_config)

sierdzio

You can disable the gold linker by passing -no-use-gold-linker to Qt's configure script.

shylock

@sierdzio said in Qt 5.11 for Beaglebone Black:

-no-use-gold-linker

Hi Serdzio,

I used my configure script syntax as you prescribed, as follow

./configure -v -opensource -confirm-license -prefix /usr/local/qt5.11 -device linux-beagleboard-g++ -device-option CROSS_COMPILE=$HOME/gcc-linaro-4.9/bin/arm-linux-gnueabi- -qt-libpng -qt-libjpeg -qpa eglfs -opengl es2 -no-gcc-sysroot -release -no-use-gold-linker

But error seems to be still creeping in I wonder why?

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Checking for machine tuple... 
+ /home/userdir/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -dumpmachine
> arm-linux-gnueabi
test config.qtbase.tests.machineTuple succeeded
Checking for valid makespec... 
+ cd /home/userdir/qt5/config.tests/verifyspec && /home/userdir/qt5/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" -early "CONFIG += cross_compile" /home/userdir/qt5/qtbase/config.tests/verifyspec
+ cd /home/userdir/qt5/config.tests/verifyspec && MAKEFLAGS= /usr/bin/make
> /home/userdir/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -c -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -mfloat-abi=hard -O2 -O3 -std=gnu++11 -w -fPIC  -I/home/userdir/qt5/qtbase/config.tests/verifyspec -I. -I/home/userdir/qt5/qtbase/mkspecs/devices/linux-beagleboard-g++ -o verifyspec.o /home/userdir/qt5/qtbase/config.tests/verifyspec/verifyspec.cpp
> /home/userdir/gcc-linaro-4.9/bin/arm-linux-gnueabi-g++ -mfloat-abi=hard -Wl,-O1 -o verifyspec verifyspec.o   -lrt -lpthread -ldl 
> /home/userdir/gcc-linaro-4.9/bin/../lib/gcc/arm-linux-gnueabi/4.9.3/../../../../arm-linux-gnueabi/bin/ld: error: verifyspec.o uses VFP register arguments, verifyspec does not
> /home/userdir/gcc-linaro-4.9/bin/../lib/gcc/arm-linux-gnueabi/4.9.3/../../../../arm-linux-gnueabi/bin/ld: failed to merge target specific data of file verifyspec.o
> collect2: error: ld returned 1 exit status
> Makefile:66: recipe for target 'verifyspec' failed
> make: *** [verifyspec] Error 1
Note: Also available for Linux: linux-clang linux-icc
ERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.

sierdzio

You are mixing hard and soft float architecture somehow. Is your sysroot using softfp? Then you should use the same for Qt compilation (currently you are using armhf - hard float).

Some additional info: https://stackoverflow.com/questions/9753749/arm-compilation-error-vfp-registered-used-by-executable-not-object-file

shylock

Sierdzio,
I modified a qmake which reside at ..qtbase/mkspec/devices/linux-beaglebone-g++/qmake.conf
as follow:

#
# qmake configuration for the BeagleBoard and BeagleBoard xM boards
# http://beagleboard.org/

MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib

include(../../common/linux.conf)
include(../../common/gcc-base-unix.conf)
include(../../common/g++-unix.conf)

load(device_config)

QT_QPA_DEFAULT_PLATFORM = eglfs

# modifications to g++.conf
QMAKE_CC                = $${CROSS_COMPILE}gcc
QMAKE_CXX               = $${CROSS_COMPILE}g++
QMAKE_LINK              = $${QMAKE_CXX}
QMAKE_LINK_SHLIB        = $${QMAKE_CXX}

# modifications to linux.conf
QMAKE_AR                = $${CROSS_COMPILE}ar cqs
QMAKE_OBJCOPY           = $${CROSS_COMPILE}objcopy
QMAKE_NM                = $${CROSS_COMPILE}nm -P
QMAKE_STRIP             = $${CROSS_COMPILE}strip

**#COMPILER_FLAGS          = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb** (disabled)
COMPILER_FLAGS          = -mfloat-abi=softfp  (enable)

#modifications to gcc-base.conf
QMAKE_CFLAGS           += $${COMPILER_FLAGS}
QMAKE_CXXFLAGS         += $${COMPILER_FLAGS}
QMAKE_CXXFLAGS_RELEASE += -O3

QMAKE_LIBS             += -lrt -lpthread -ldl

# Extra stuff (OpenGL, DirectFB, ...)
QMAKE_INCDIR_EGL        =
QMAKE_LIBDIR_EGL        =
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_LIBDIR_OPENGL_ES2 = $${QMAKE_LIBDIR_EGL}
QMAKE_INCDIR_OPENVG     = $${QMAKE_INCDIR_EGL}
QMAKE_LIBDIR_OPENVG     = $${QMAKE_LIBDIR_EGL}

QMAKE_LIBS_EGL          = -lEGL -lIMGegl -lsrv_um
QMAKE_LIBS_OPENGL_ES2   = -lGLESv2 $${QMAKE_LIBS_EGL}
QMAKE_LIBS_OPENVG       = -lOpenVG $${QMAKE_LIBS_EGL}

**#DISTRO_OPTS += hard-float** (disabled completely)

# No need for any special EGL device integration.
# Prioritize the default, compiled-in integration over any plugins.
EGLFS_DEVICE_INTEGRATION = none

include(../common/linux_arm_device_post.conf)

load(qt_config)

The configuration syntax as follow:

./configure -v -opensource -confirm-license -prefix /usr/local/qt5.11 -device linux-beagleboard-g++ -device-option CROSS_COMPILE=$HOME/gcc-linaro-4.9/bin/arm-linux-gnueabi- -qt-libpng -qt-libjpeg -qpa eglfs -no-opengl -qpa tslib -no-gcc-sysroot -release -no-use-gold-linker

This time ./configuration script succeeded, I hope this could be reference to someone who need solution.
please advise who to update the QT website page for BBB.
https://wiki.qt.io/BeagleBone_Black_Beginners_Guide
Thank you,

sierdzio

@shylock said in Qt 5.11 for Beaglebone Black:

This time ./configuration script succeeded, I hope this could be reference to someone who need solution.
please advise who to update the QT website page for BBB.
https://wiki.qt.io/BeagleBone_Black_Beginners_Guide

Hey, wow, great news :-) Please also try the compilation itself, too - sometimes the configure tests do not pick all the issues up and compilation fails later (well, Qt is a big beast).

You should be able to modify the wiki page yourself - after editing it will display some scary error message but it is OK - the page will be put up for moderation (probably by @tekojo , I'm not sure who accepts the wiki changes).

shylock

Thank 4 confidence,
But I am still grappling with the following problem

"./qt-arm-test: error while loading shared libraries: libQt5Widgets.so.5: cannot open shared object file: No such file or directory"

I checked contents of directory of /usr/local/qt5.11/lib

cmake                             libQt5InputSupport.prl
libQt5AccessibilitySupport.a      libQt5Network.la
libQt5AccessibilitySupport.la     libQt5Network.prl
libQt5AccessibilitySupport.prl    libQt5Network.so
libQt5Bootstrap.a                 libQt5Network.so.5
libQt5Bootstrap.la                libQt5Network.so.5.10
libQt5Bootstrap.prl               libQt5Network.so.5.10.1
libQt5Concurrent.la               libQt5PrintSupport.la
libQt5Concurrent.prl              libQt5PrintSupport.prl
libQt5Concurrent.so               libQt5PrintSupport.so
libQt5Concurrent.so.5             libQt5PrintSupport.so.5
libQt5Concurrent.so.5.10          libQt5PrintSupport.so.5.10
libQt5Concurrent.so.5.10.1        libQt5PrintSupport.so.5.10.1
libQt5Core.la                     libQt5ServiceSupport.a
libQt5Core.prl                    libQt5ServiceSupport.la
libQt5Core.so                     libQt5ServiceSupport.prl
libQt5Core.so.5                   libQt5Sql.la
libQt5Core.so.5.10                libQt5Sql.prl
libQt5Core.so.5.10.1              libQt5Sql.so
libQt5DBus.la                     libQt5Sql.so.5
libQt5DBus.prl                    libQt5Sql.so.5.10
libQt5DBus.so                     libQt5Sql.so.5.10.1
libQt5DBus.so.5                   libQt5Test.la
libQt5DBus.so.5.10                libQt5Test.prl
libQt5DBus.so.5.10.1              libQt5Test.so
libQt5DeviceDiscoverySupport.a    libQt5Test.so.5
libQt5DeviceDiscoverySupport.la   libQt5Test.so.5.10
libQt5DeviceDiscoverySupport.prl  libQt5Test.so.5.10.1
libQt5EdidSupport.a               libQt5ThemeSupport.a
libQt5EdidSupport.la              libQt5ThemeSupport.la
libQt5EdidSupport.prl             libQt5ThemeSupport.prl
libQt5EventDispatcherSupport.a    libQt5Widgets.la
libQt5EventDispatcherSupport.la   libQt5Widgets.prl
libQt5EventDispatcherSupport.prl  libQt5Widgets.so
libQt5FbSupport.a                 libQt5Widgets.so.5
libQt5FbSupport.la                libQt5Widgets.so.5.10
libQt5FbSupport.prl               libQt5Widgets.so.5.10.1
libQt5FontDatabaseSupport.a       libQt5Xml.la
libQt5FontDatabaseSupport.la      libQt5Xml.prl
libQt5FontDatabaseSupport.prl     libQt5Xml.so
libQt5Gui.la                      libQt5Xml.so.5
libQt5Gui.prl                     libQt5Xml.so.5.10
libQt5Gui.so                      libQt5Xml.so.5.10.1
libQt5Gui.so.5                    libqtfreetype.a
libQt5Gui.so.5.10                 libqtfreetype.prl
libQt5Gui.so.5.10.1               libqtlibpng.a
libQt5InputSupport.a              libqtlibpng.prl
libQt5InputSupport.la             pkgconfig

I manage to build the qt on my x86_64 server.
after "sudo make install on my dev machine"
I copied an entire directory of qt5.11 across the BBB and moved in /usr/local/qt5.11 directory structure.
the directory /usr/local/qt5.11/lib has all the libs which were build on theserver.
A quick small qt program developed and deployed to BBB to run ./qt-arm-test But
I have following problem
error while loading shared libraries: libQt5Widgets.so.5: cannot open shared object file: No such file or directory
I ran ldconfig -v and my environment variable for LD_LIBRARY_PATH=/usr/local/qt5.11/lib

echo $LD_LIBRARY_PATH 
/usr/local/qt5.11/lib:/usr/local/lib:/lib/arm-linux-gnueabihf:/lib

while $PATH variable also points to qt5.11/lib directory.
But still, the application failed to run. How can be remedied this problem? I have thrown almost everything lock, stock n barrel.

sierdzio

Check where it is looking for libQt5Widgets with ldd:

ldd qt-arm-test

You can also run it on your Qt .so files to see if they look correct.

shylock

I am using BBB with kernel 4.15.1 without any graphical server.
I understood that the QT provide graphical rendering on the screen. As I knew that
graphic rendering done by X11 windowing system or Framebuffer or EGLs by qt but in true sense egls require sgfx_graphic rendering manager to which currently not installed in fact none of x11, xorg, fb or sgx driver currently exists with kernel.
My requirements are minimum or no desktop graphical environment. The application program will render all the graphic through Qt's egls facility.
Can you please shed a light on this to run minimum graphic or only Qt-application will render graphics during its session.
How can be achieved.

sierdzio

Qt can run without windowing system when you run it with EGLFS plugin. Possibly also with LinuxFB, but that plugin is not actively maintained anymore. You need to have the drivers and OpenGL libs installed.

To make sure EGLFS plugin is compiled, check your configure output.

To run your application with EGLFS plugin, run it like this:

./your_app -platform eglfs

shylock

Hi
I built Qt5 for Beaglebone Black, ON BeagleBone Black computer itsefl with 'arm-linux-gnueabihf-' compiler located in the BBB's /usr/bin/ directory an entire qt5 build succeeded
cloning http://code.qt.io/cgit/qt/qt5.git/?h=5.11
and configuring as follow:
./configure -v -opensource -confirm-license -prefix /usr/local/qt5.11 -device linux-beagleboard-g++ -device-option
CROSS_COMPILE=/usr/arm-linux-gnueabihf- -qt-libpng -qt-libjpeg -no-opengl -qpa eglfs -no-gcc-sysroot -release -no-use-gold-linker -ico -gif -platform linux-clang
when I run a test program on the BBB computer I am keep getting following message:
This application failed to start because it could not find the Qt platform plugin "eglfs" in "".
Application platform plugins are: linuxfb, minimal, offscreen, vnc
Reinstalling the application may fix this problem.
Aborted.

Although I have install xdm, xorg on BBB and I can startx window which run perfectly but my own test program cannot????
as you can see I included in my configure eglfs option.
Some help will be truly grateful
thank you,

sierdzio

Check configure output - does it say that EGLFS support will actually be compiled?

xdm, xorg on BBB and I can startx

That's unrelated to EGLFS.

shylock

Hello Sierdzio,
I revisited my qt5 build as follow
/home/username/qt5/qtbase/src/plugins/platforms
Where Makefile resides. Runnings again 'make' that will build entire contents of platform directory including eglfs vnc and linuxfb ... etc.
while 'sudo make install' will get installed in /usr/local/qt5.11/... directory I assume. So the rebuilding platforms directory will definitely build eglfs and install.
Whats your thoughts ... pls let know.

sierdzio

@shylock said in Qt 5.11 for Beaglebone Black:

Whats your thoughts ... pls let know.

None, I don't know what your question is ;)