Cross-compiling issues with Qt4 fw

TimeWalker75a · 17. April 2017

Trying to follow the cross-compiling routines and keep running into the following problem on both Ubuntu 16.04 and Mint 18.1 KDE. Qt installs as 4.8.7 from libqt4-dev.

Code

CPack: Create package
CPack: - package: /home/mint/hyperion/build-x86x64/hyperion-1.3.0-Linux-ambilight.sh generated.
build directory = ./build-x86x64
repository root dirrectory = .
create ./deploy/hyperion_x86x64.tar.gz


--- build release for rpi ---


-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /home/mint/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc
-- Check for working C compiler: /home/mint/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /home/mint/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++
-- Check for working CXX compiler: /home/mint/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- ENABLE_ZEROCONF = OFF
-- ENABLE_AMLOGIC = OFF
-- ENABLE_DISPMANX = ON
-- ENABLE_FB = OFF
-- ENABLE_OSX = OFF
-- ENABLE_SPIDEV   = ON
-- ENABLE_TINKERFORGE = ON
-- ENABLE_V4L2 = ON
-- ENABLE_WS2812BPWM = ON
-- ENABLE_WS281XPWM = ON
-- ENABLE_X11 = OFF
-- ENABLE_QT5 = OFF
-- ENABLE_TESTS = OFF
-- ENABLE_PROFILER = OFF
-- Current Version: master (GitHub-69f4b32/6445c35-1481143098)


CMake Warning at cmake/qt4/FindQt4.cmake:615 (message):
  /usr/bin/qmake-qt4 reported QT_INSTALL_LIBS as "/usr/lib/x86_64-linux-gnu"
  but QtCore could not be found there.  Qt is NOT installed correctly for the
  target build environment.
Call Stack (most recent call first):
  CMakeLists.txt:154 (find_package)




CMake Error at cmake/qt4/FindQt4.cmake:619 (message):
  Could NOT find QtCore.  Check
  /home/mint/hyperion/build-rpi/CMakeFiles/CMakeError.log for more details.
Call Stack (most recent call first):
  CMakeLists.txt:154 (find_package)

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So the debian package is built ok, but the actual cross-compile fails. The paths are as follows and QT_INSTALL_LIBS is indeed that.

Code

mint@mint-vb ~ $ qmake-qt4 -query
QT_INSTALL_PREFIX:/usr
QT_INSTALL_DATA:/usr/share/qt4
QT_INSTALL_DOCS:/usr/share/qt4/doc
QT_INSTALL_HEADERS:/usr/include/qt4
QT_INSTALL_LIBS:/usr/lib/x86_64-linux-gnu
QT_INSTALL_BINS:/usr/lib/x86_64-linux-gnu/qt4/bin
QT_INSTALL_PLUGINS:/usr/lib/x86_64-linux-gnu/qt4/plugins
QT_INSTALL_IMPORTS:/usr/lib/x86_64-linux-gnu/qt4/imports
QT_INSTALL_TRANSLATIONS:/usr/share/qt4/translations
QT_INSTALL_CONFIGURATION:/etc/xdg
QT_INSTALL_EXAMPLES:/usr/lib/qt4/examples
QT_INSTALL_DEMOS:/usr/lib/qt4/demos
QMAKE_MKSPECS:/usr/share/qt4/mkspecs
QMAKE_VERSION:2.01a
QT_VERSION:4.8.7

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So at the very least, FindQt4 should be finding the soft links ?

Code

mint@mint-vb ~ $ ls -la /usr/lib/x86_64-linux-gnu | grep libQtCore
-rw-r--r--   1 root root      655 Jun  2  2016 libQtCore.prl
lrwxrwxrwx   1 root root       18 Apr 17 20:57 libQtCore.so -> libQtCore.so.4.8.7
lrwxrwxrwx   1 root root       18 Apr 16 10:54 libQtCore.so.4 -> libQtCore.so.4.8.7
lrwxrwxrwx   1 root root       18 Apr 16 10:54 libQtCore.so.4.8 -> libQtCore.so.4.8.7
-rw-r--r--   1 root root  3086448 Jun  2  2016 libQtCore.so.4.8.7

Any help is appreciated.

Akriss · 17. April 2017

I'm fairly sure this link well help you.

http://stackoverflow.com/quest…939/cmake-not-finding-qt4

TimeWalker75a · 17. April 2017

Zitat von Akriss

I'm fairly sure this link well help you.

Thanks, but I wouldn't be so sure as the thread goes on to describe how to amend PATH to be able to invoke qmake, whereas I already have that working and qmake is reporting the library path to cmake by using -query. Should probably mention that qmake is just a softlink to qmake-qt4, so can call it either way as both directories are in PATH.

Tried setting QTDIR=/usr/lib/x86_64-linux-gnu/qt4 in my .bashrc to no avail either.

Code

mint@mint-vb ~ $ which qmake
/usr/bin/qmake
mint@mint-vb ~ $ ls -la /usr/bin/qmake
lrwxrwxrwx 1 root root 9 Apr 17 10:34 /usr/bin/qmake -> qtchooser
mint@mint-vb ~ $ which qmake-qt4
/usr/bin/qmake-qt4
mint@mint-vb ~ $ ls -la /usr/bin/qmake-qt4
lrwxrwxrwx 1 root root 37 Jun  2  2016 /usr/bin/qmake-qt4 -> ../lib/x86_64-linux-gnu/qt4/bin/qmake
mint@mint-vb ~ $ qmake
Usage: /usr/lib/x86_64-linux-gnu/qt4/bin/qmake [mode] [options] [files]


...
mint@mint-vb ~ $ qtchooser -print-env
QT_SELECT="default"
QTTOOLDIR="/usr/lib/x86_64-linux-gnu/qt4/bin"
QTLIBDIR="/usr/lib/x86_64-linux-gnu"

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There's something else that is going on with Qt unfortunately. I had a look around for quite a while but couldn't find any indication on how to fix this.

Akriss · 18. April 2017

You may need the QT4 Dev packages (libqt4-dev) iinstalled?

TimeWalker75a · 18. April 2017

Zitat von Akriss

You may need the QT4 Dev packages (libqt4-dev) iinstalled?

Indeed, except it's installed.

Zitat von TimeWalker75a

Qt installs as 4.8.7 from libqt4-dev.

TimeWalker75a · 19. April 2017

After lots of toolchain rebuilding and rsync resyncing, I made it further to

Code

/home/mint/raspberrypi/rootfs/usr/include/python2.7/../stdlib.h:760:34: fatal error: bits/stdlib-bsearch.h: No such file or directory
 # include <bits/stdlib-bsearch.h>

My stdlib is actually pulled into /rootfs/usr/include/arm-linux-gnueabihf, so I had to add

Code

include_directories(${RASPCROSS_DIR}/rootfs/usr/include/arm-linux-gnueabihf)

into cmake/Toolchain-rpi.cmake

Now it's getting all the way to this. I'd pulled /lib and /usr from OSMC 2017.03-1 .. tried building with linaro 4.2 and 4.3, but always end up here. What is it not liking about the libs, the linked versions are all over the place?

Code

Scanning dependencies of target hyperiond
[ 95%] Building CXX object src/hyperiond/CMakeFiles/hyperiond.dir/hyperiond.cpp.o
[ 95%] Linking CXX executable ../../bin/hyperiond
/home/mint/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf/libpython2.7.so: undefined reference to `__fdelt_chk@GLIBC_2.15'
/home/mint/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf/libusb-1.0.so: undefined reference to `clock_gettime@GLIBC_2.17'
/home/mint/raspberrypi/rootfs/lib/arm-linux-gnueabihf/libudev.so.1: undefined reference to `name_to_handle_at@GLIBC_2.14'
/home/mint/raspberrypi/rootfs/lib/arm-linux-gnueabihf/libudev.so.1: undefined reference to `secure_getenv@GLIBC_2.17'
collect2: error: ld returned 1 exit status
src/hyperiond/CMakeFiles/hyperiond.dir/build.make:122: recipe for target 'bin/hyperiond' failed
make[2]: *** [bin/hyperiond] Error 1
CMakeFiles/Makefile2:1352: recipe for target 'src/hyperiond/CMakeFiles/hyperiond.dir/all' failed
make[1]: *** [src/hyperiond/CMakeFiles/hyperiond.dir/all] Error 2
Makefile:149: recipe for target 'all' failed

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TimeWalker75a · 20. April 2017

Managed to get it building, just had to tweak the crosscompile script quite a lot. Posting just the relevant bits for RPi.

Code

#ON TARGET
#sudo apt-get install libQt4-dev libusb-1.0-0-dev rsync
#############
#ON HOST
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install git rsync cmake build-essential libqt4-dev libusb-1.0-0-dev python-dev libxrender-dev
#########


export PATH=$PATH:$HOME/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin
export TARGET_IP=192.168.0.115
export TARGET_USER=pi


export RASPCROSS_DIR=$HOME/raspberrypi
export ROOTFS_DIR=$RASPCROSS_DIR/rootfs
export HYPERION_DIR=$HOME/hyperion
export TOOLCHAIN_FILE=$HYPERION_DIR/cmake/Toolchain-rpi.cmake


mkdir -p "$ROOTFS_DIR"
rsync -rlP --delete-after --copy-unsafe-links $TARGET_USER@$TARGET_IP:/{lib,usr} "$ROOTFS_DIR"


######## pi specific #########
git clone --depth 1 https://github.com/raspberrypi/firmware.git $RASPCROSS_DIR/firmware
git clone --depth 1 https://github.com/raspberrypi/tools.git $RASPCROSS_DIR/tools
ln -fs $RASPCROSS_DIR/firmware/hardfp/opt $ROOTFS_DIR/opt


# fix libvc missing deps by linking the libs over
ln -fs $ROOTFS_DIR/opt/vc/lib/libvcos.so $ROOTFS_DIR/usr/lib/arm-linux-gnueabihf/libvcos.so
ln -fs $ROOTFS_DIR/opt/vc/lib/libvchiq_arm.so $ROOTFS_DIR/usr/lib/arm-linux-gnueabihf/libvchiq_arm.so
##### end of pi specific ######


# get hyperion sources
git clone --recursive https://github.com/hyperion-project/hyperion.git "$HYPERION_DIR"
# fix <bits/stdlib-bsearch.h> include issues by settings SYSROOT explicitly
grep -q "CMAKE_SYSROOT" $TOOLCHAIN_FILE
if [ $? -ne 0 ]; then
   echo "SET(CMAKE_SYSROOT ${RASPCROSS_DIR}/rootfs)" >> $TOOLCHAIN_FILE
fi
# we do a native build first (to build the protobuf compiler for the native platform)
# then for cross-build, we specify the protoc export file to import the protobuf compiler
#
cd $HYPERION_DIR && chmod +x bin/*.sh
. bin/create_all_releases.sh

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Also builds fine with Qt 5.4.2 and Python 3.4.2 given the appropriate changed to cmake files.

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