Problems linking Matlab libraries into Qt (Linux) .. libeng.so: undefined reference to ..

eduardo_parra

Hey
I want to create a program that has a user interface for inputs and outputs that is created using Qt c++ IDE and back functions that are programmed using matlab.
To do that im using MATLAB Engine library in GUI code, but im having problems to link the Matlab libraries.
My code of the .pro file is:

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
SOURCES += main.c
include(deployment.pri)
qtcAddDeployment()
INCLUDEPATH += $$PWD/../../../MATLAB/R2016a/extern/include
INCLUDEPATH += $$PWD/../../../MATLAB/R2016a/bin/glnxa64
DEPENDPATH += $$PWD/../../../MATLAB/R2016a/bin/glnxa64
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64/release/
-lmex
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64
/debug/ -lmex
else:unix: LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64/ -lmex
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64/release/
-leng
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64
/debug/ -leng
else:unix: LIBS += -L$$PWD/../../../MATLAB/R2016a/bin/glnxa64/ -leng

The compile output is as follows:

14:50:27: Running steps for project untitled...
14:50:27: Configuration unchanged, skipping qmake step.
14:50:27: Starting: "/usr/bin/make" 
g++ -Wl,-rpath,/home/tecnobit/Qt5.5.0/5.5/gcc_64 -o untitled main.o   -L/home/user/desktop/untitled
/../../../MATLAB/R2016a/bin/glnxa64/ -lmex -leng 
/usr/bin/ld: warning: libut.so, needed by /home/user/desktop/untitled/../../../MATLAB/R2016a
/bin/glnxa64//libeng.so, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libmx.so, needed by /home/user/desktop/untitled/../../../MATLAB/R2016a
/bin/glnxa64//libeng.so, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libmat.so, needed by /home/user/desktop/untitled/../../../MATLAB/R2016a
/bin/glnxa64//libeng.so, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libboost_system.so.1.56.0, needed by /home/user/desktop/untitled/../../../MATLAB
/R2016a/bin/glnxa64//libeng.so, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libmwcpp11compat.so, needed by /home/user/desktop/untitled/../../../MATLAB
/R2016a/bin/glnxa64//libeng.so, not found (try using -rpath or -rpath-link)
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`utF2cstr'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`utFree'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`matClose'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`matPutNextVariable'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`matCreateMATFile'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`matrix::detail::noninlined::mx_array_api::mxDestroyArray(mxArray_tag*)'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`matGetNextVariable'
/home/user/desktop/untitled/../../../MATLAB/R2016a/bin/glnxa64//libeng.so: undefined reference to 
`utCalloc'
collect2: error: ld returned 1 exit status
make: *** [untitled] Error 1
14:50:27: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project untitled (kit: Desktop Qt 5.5.0 GCC 64bit)
When executing step "Make"
14:50:27: Elapsed time: 00:00.

Everything that i found in google couldn't help, can somebody help me i've got really no idea what to do...

sierdzio

The warning messages seem pretty clear - you need to add -L and -l paths to libut.so, libmx.so, libmat.so, boost, etc. Or install them in your system.

eduardo_parra

@sierdzio Thank you for answer. I have already try that, but i can't add 'libboost_system.so.1.56.0' library as it does not finish with .so. Any idea?

sierdzio

Install it in your system, then:

sudo apt-get install libboost1.56-dev

In newest Ubutu the lib is actually 1.58, but maybe they are compatible. Once it is installed in the system, you don't need to add it to your LIBS in the .pro file - it will be linked automatically.

eduardo_parra

@sierdzio I have tried to install it, unfortunately it cant be located. I can install the previous version : libboost1.55-dev, but it does not solve the problem. I have already tried upgrade and update before the install. Should i use a newer version of Ubuntu? My current version is 14.04.

sierdzio

Try here, then: http://packages.ubuntu.com/wily/amd64/libboost1.58-all-dev/download

Or compile boost from source.

eduardo_parra

@sierdzio Im having a lot of problems to install it because of the dependencies with other libraries

Unsolved Problems linking Matlab libraries into Qt (Linux) .. libeng.so: undefined reference to ..