Including Matlab into Qt: Runtime Error - Shared object not open

Rob123 · 26 Jan 2018, 09:10

I'm trying to include a Matlab program into Qt Creator on Ubuntu by using the Matlab Compiler. Therefore, I use a simple test program. In terminal everything works fine when I export LD_LIBRARY_PATH like this:

export LD_LIBRARY_PATH=/home/robin/Matlab_Runtime/v93/runtime/glnxa64:/home/robin/Matlab_Runtime/v93/bin/glnxa64:/home/robin/Matlab_Runtime/v93/sys/os/glnxa64:

and then run the program. Building the project in Qt Creator works fine, too, but on runtime I'm getting:

An Error has occurred while trying to initialize the MATLAB Runtime.  
The error is: Fatal error loading library /home/robin/Matlab_Runtime/v93/bin/glnxa64/libmat.so Error: /home/robin/Matlab_Runtime/v93/bin/glnxa64/libmat.so: shared object not open
An Error has occurred while trying to initialize the MATLAB Runtime.  
The error is: Fatal error loading library /home/robin/Matlab_Runtime/v93/bin/glnxa64/libmwmclbase.so Error: /home/robin/Matlab_Runtime/v93/bin/glnxa64/libmwmclbase.so: shared object not open
could not initialize the application properly

My LD_LIBRARY_PATH is:

/home/robin/Qt/5.9.1/gcc_64/lib:/home/robin/projects_opencv/Matlab_compiler_test/../../Matlab_Runtime/v93/runtime/glnxa64/:/home/robin/Matlab_Runtime/v93/runtime/glnxa64:/home/robin/Matlab_Runtime/v93/bin/glnxa64:/home/robin/Matlab_Runtime/v93/sys/os/glnxa64:/home/robin/Matlab_Runtime/v93/sys/opengl/lib/glnxa64:/home/robin/Matlab_Runtime/v93/extern/include

Relevant lines in my .pro file:

INCLUDEPATH += /home/robin/Matlab_Runtime/v93/extern/include
LIBS += -L$$PWD/../../Matlab_Runtime/v93/runtime/glnxa64/ -lmwmclmcrrt
INCLUDEPATH += $$PWD/../../Matlab_Runtime/v93/runtime/glnxa64
DEPENDPATH += $$PWD/../../Matlab_Runtime/v93/runtime/glnxa64
LIBS += -L$$PWD/../../Matlab_Runtime/v93/bin/glnxa64/ -lmat -lmwmclbase
INCLUDEPATH += $$PWD/../../Matlab_Runtime/v93/bin/glnxa64
DEPENDPATH += $$PWD/../../Matlab_Runtime/v93/bin/glnxa64

I'm grateful for any kind of help on this. Thank you very much!

jsulm · 27 Jan 2018, 11:27

@Rob123 Are you trying to start your app from QtCreator?
If so then set the LD_LIBRARY_PATH variable in Run settings of your project (in QtCreator on the left side "Projects/Build & Run".

Rob123 · 2 Feb 2018, 09:03

@jsulm Thank you for your answer! I did already. My LD_LIBRARY_PATH in build and run in environment is both: /home/robin/Qt/5.9.1/gcc_64/lib:/home/robin/Matlab_Runtime/v93/runtime/glnxa64:/home/robin/Matlab_Runtime/v93/bin/glnxa64:/home/robin/Matlab_Runtime/v93/sys/os/glnxa64:/home/robin/Matlab_Runtime/v93/sys/opengl/lib/glnxa64:/home/robin/Matlab_Runtime/v93/extern/include

SGaist · 2 Feb 2018, 09:02

Hi,

Not to nitpick, but you’re missing the LD_ in the environment variable name. Is it a typo here ?

Rob123 · wrote on 2 Feb 2018, 09:02

@SGaist just a typo ;) thanks anyway

SGaist · wrote on 2 Feb 2018, 22:12

Did you try to run ldd on these libraries to check their dependencies ?

zhaopengdt · wrote on 1 Nov 2018, 16:21

@Rob123 Did you solve this problem? I am encountering the same issue. Could you please tell me how to resolve this if you have found a way?

slanoe · wrote on 4 Jun 2019, 12:20

I think the problem comes from the Qt libraries embedded in Matlab which are in version 5.5.1 for Matlab v93. Try to compile your project in 5.5.1 rather than 5.9.1 to avoid conflict between Qt versions.