Can't find libQt5Core lib

SGaist

Hi,

Unless you modified the rpath of your application, putting your application dependencies in the same folder won't have any effect. You can use the LD_LIBRARY_PATH environment variable to give additional paths to the loader to search in when starting your application.

r3d9u11

@SGaist thanks for answer. Yes, I did set LD_LIBRARY_PATH to needed value.
So, I recompiled my application, did copy of needed libs to embedded device and setted LD_LIBRARY_PATH.
Now I have another exception:

/ta512/./ta: error while loading shared libraries: /home/imx6/Desktop/qt5120/sysroot/usr/lib/libz.so: cannot open shared object file: No such file or directory

This is path on my host-machine, but not in the current embedded device.
The path to libz in my embedded device is /ta512/lib/libz.so and it already defined in LD_LIBRARY_PATH.
Why application remembered a full path to libz from my host-machine and doesn't looks in LD_LIBRARY_PATH?
(directly my application doen't uses libz, which requires by glib, which requires by Qt)

SGaist

You should run ldd (with LD_LIBRARY_PATH defined) on your application and its dependencies to see where it's currently looking for them.

r3d9u11

@SGaist

# export LD_LIBRARY_PATH=/ta512/glib:/ta512/qt5lib
# /ta512/ta   
/ta512/ta: error while loading shared libraries: /home/imx6/Desktop/qt5120/sysroot/usr/lib/libz.so: cannot open shared object file: No such file or directory
# ldd /ta512/ta
/ta512/ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5' not found (required by /ta512/ta)
/ta512/ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5_PRIVATE_API' not found (required by /ta512/qt5lib/libQt5Widgets.so.5)
/ta512/ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5' not found (required by /ta512/qt5lib/libQt5Widgets.so.5)
/ta512/ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5_PRIVATE_API' not found (required by /ta512/qt5lib/libQt5Gui.so.5)
/ta512/ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5' not found (required by /ta512/qt5lib/libQt5Gui.so.5)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicui18n.so.55)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicui18n.so.55)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicui18n.so.55)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicuuc.so.55)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicuuc.so.55)
/ta512/ta: /ta512/glib/libstdc++.so.6: no version information available (required by /usr/lib/arm-linux-gnueabihf/libicuuc.so.55)
/ta512/ta: /lib/arm-linux-gnueabihf/libc.so.6: version `GLIBC_2.28' not found (required by /ta512/glib/libglib-2.0.so.0)
	linux-vdso.so.1 =>  (0x7ee3e000)
	libQt5Widgets.so.5 => /ta512/qt5lib/libQt5Widgets.so.5 (0x76a51000)
	libQt5Gui.so.5 => /ta512/qt5lib/libQt5Gui.so.5 (0x765b0000)
	libQt5Core.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 (0x7624b000)
	libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x76227000)
	libstdc++.so.6 => /ta512/glib/libstdc++.so.6 (0x760be000)
	libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x76045000)
	libgcc_s.so.1 => /ta512/glib/libgcc_s.so.1 (0x76016000)
	libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x75f2a000)
	/home/imx6/Desktop/qt5120/sysroot/usr/lib/libz.so => not found
	libz.so.1 => /ta512/glib/libz.so.1 (0x75efa000)
	libicui18n.so.55 => /usr/lib/arm-linux-gnueabihf/libicui18n.so.55 (0x75d60000)
	libicuuc.so.55 => /usr/lib/arm-linux-gnueabihf/libicuuc.so.55 (0x75c42000)
	libpcre16.so.3 => /usr/lib/arm-linux-gnueabihf/libpcre16.so.3 (0x75bec000)
	libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x75bd9000)
	libglib-2.0.so.0 => /ta512/glib/libglib-2.0.so.0 (0x75a43000)
	librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x75a2c000)
	/lib/ld-linux-armhf.so.3 (0x54ae3000)
	libicudata.so.55 => /usr/lib/arm-linux-gnueabihf/libicudata.so.55 (0x74165000)

r3d9u11

@SGaist ok, I recompiled qtbase without glib, and now I return to the topic theme:

# ls /ta512
Makefile         libQt5Widgets.so.5  moc_mainwindow.cpp  ta
libQt5Core.so.5  main.o              moc_mainwindow.o    ta.sh
libQt5Gui.so.5   mainwindow.o        moc_predefs.h       ui_mainwindow.h

and run:

# export LD_LIBRARY_PATH=/ta512
# ./ta
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by ./ta)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5_PRIVATE_API' not found (required by /ta512/libQt5Widgets.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by /ta512/libQt5Widgets.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5_PRIVATE_API' not found (required by /ta512/libQt5Gui.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by /ta512/libQt5Gui.so.5)
# ldd ta
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by ./ta)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5_PRIVATE_API' not found (required by /ta512/libQt5Widgets.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by /ta512/libQt5Widgets.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5_PRIVATE_API' not found (required by /ta512/libQt5Gui.so.5)
./ta: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version 'Qt_5' not found (required by /ta512/libQt5Gui.so.5)
	linux-vdso.so.1 =>  (0x7ece4000)
	libQt5Widgets.so.5 => /ta512/libQt5Widgets.so.5 (0x769e1000)
	libQt5Gui.so.5 => /ta512/libQt5Gui.so.5 (0x76540000)
	libQt5Core.so.5 => /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 (0x761db000)
	libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x761b7000)
	libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x760a9000)
	libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x76031000)
	libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x76008000)
	libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x75f1c000)
	libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0x75efa000)
	libicui18n.so.55 => /usr/lib/arm-linux-gnueabihf/libicui18n.so.55 (0x75d61000)
	libicuuc.so.55 => /usr/lib/arm-linux-gnueabihf/libicuuc.so.55 (0x75c43000)
	libpcre16.so.3 => /usr/lib/arm-linux-gnueabihf/libpcre16.so.3 (0x75bec000)
	libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x75bd9000)
	libglib-2.0.so.0 => /lib/arm-linux-gnueabihf/libglib-2.0.so.0 (0x75b01000)
	librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x75aeb000)
	/lib/ld-linux-armhf.so.3 (0x54b87000)
	libicudata.so.55 => /usr/lib/arm-linux-gnueabihf/libicudata.so.55 (0x74224000)
	libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3 (0x741c6000)

SGaist

You are not deploying libQt5Core.so.5 along the other Qt libraries in your ta512 folder.

r3d9u11

@SGaist no, I'm deploying only 3 Qt libs in folder /ta512

r3d9u11

@SGaist ok, I built Qt 5.9.7 with options:

    -verbose                        \
    -nomake tests                   \
    -nomake examples                \
    -no-use-gold-linker             \
    -no-opengl                      \
    -no-dbus                        \
    -no-glib                        \
    -no-icu                         \
    -rpath

and the target Qt application on the embedded device did found the Qt libs, but I've got another exception:

./qt_c: /lib/arm-linux-gnueabihf/libc.so.6: version `GLIBC_2.28' not found (required by /ta/libQt5Core.so.5)

sure, version of glib on the target device is 2.23, but Qt was configured without GLIB support. Why Qt still require this library?

well, as latest results with same cross-compilations process (e.g. same tools, compiler, QtCreator settings, etc):

cross-compiled app with Qt 5.12.0 can't find self Qt libraries
cross-compiled app with Qt 5.9.7 can find self Qt libraries, but can't work without GLIB < v2.28 (even configured without glib support)

SGaist

And why are you not deploying the Qt5Core library since you already deploy the others ?

r3d9u11

@SGaist as I told before I did copy Qt libs with application to the target embedded device (as you can see the folder /ta512 already contains all needed Qt libs and executable application), also I did set value of LD_LIBRARY_PATH to /ta512 before application has been started.

SGaist

That's clear, but from your last test, why only these three libs and not QtCore ?

r3d9u11

@SGaist sorry, maybe I don't understand you question right. Does libQt5Core.so.5 (which was already deployed with application to the target device) is not "Qt5Core library"?

SGaist

The question is: since you are deploying 3 Qt libraries already, why not the Qt5Core ?

r3d9u11

@SGaist Sorry, but what do you mean under "Qt5Core"? "libQt5Core.so" is a "Qt5Core", isn't it?

SGaist

Yes it is.

r3d9u11

@SGaist because the target application is looking for the libQt5Core.so.5, not for libQt5Core.so

howewer I'll try to do copy of all aliases: libQt5Core.so, libQt5Core.so.5 and libQt5Core.so.5.12.0

thanks for hint!
and happy New Year ;)

SGaist

If you want to be sure the loader finds the correct library where you put them, then yes, copy all the aliases up to the library itself.

r3d9u11

@SGaist I did copy for each needed alias, but nothing changes:

# export LD_LIBRARY_PATH=/ta_20190102115904/qt5lib
# ls $LD_LIBRARY_PATH
libQt5Core.so         libQt5Gui.so         libQt5Widgets.so
libQt5Core.so.5       libQt5Gui.so.5       libQt5Widgets.so.5
libQt5Core.so.5.12.0  libQt5Gui.so.5.12.0  libQt5Widgets.so.5.12.0
# cd /ta_20190102115904
# ./qt_c
./qt_c: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: version `Qt_5' not found (required by ./qt_c)

Ok, I did remove system version:

# mv /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5 /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5.orig
# mv /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5.5 /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5.5.orig
# mv /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5.5.1 /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5.5.1.orig
# ./qt_c
./qt_c: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory

(there is no alias /usr/lib/arm-linux-gnueabihf/libQt5Core.so)
All binaries have a right arch, I think:

# file qt5lib/libQt5Core.so
qt5lib/libQt5Core.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (GNU/Linux), dynamically linked, for GNU/Linux 4.11.0, not stripped
# file qt5lib/libQt5Core.so.5
qt5lib/libQt5Core.so.5: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (GNU/Linux), dynamically linked, for GNU/Linux 4.11.0, not stripped
# file qt5lib/libQt5Core.so.5.12.0
qt5lib/libQt5Core.so.5.12.0: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (GNU/Linux), dynamically linked, for GNU/Linux 4.11.0, not stripped
# file qt_c
qt_c: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 3.2.0, not stripped

cross compiled Qt application don't want to use cross-compiled Qt libraries.
I don't understand what's wrong :(

I'll try to use a previous version of the toolchain

r3d9u11

Looks like older compiler solved this topic.