How to get details on "Unable to load interface library" in using clib.

We're building interface modules for a C++ library with clibgen - in different linux setups (server, local PC, cloud). We have a build that works, but not on all setups - and we use Matlab2021a. The error message on computer is:

Unable to load interface library:

'/home/de11/sim_interfaces/matlab_to_cpp/cpp_lib/WI_MatlabInterface/WI_MatlabInterfaceInterface.so'.

Reason: The specified module could not be found.

Ensure the C++ dependent libraries for the interface library are added to

run-time path.

is telling me something, but not the full picture. As far as i can see all C++ dependent libraries are on the LD_LIBRARY_PATH and calling ldd on the command line tells me all dependencies can be resolved.

But how can i check the same within the matlab session?

[Sreevatsank K]

I am facing the same issue, were you able to resolve this?

Answer 1

[Andreas Lobinger]

Partial solution:

one can call ldd via system - within the matlab enviroment.

>> system('ldd WI_MatlabInterfaceInterface.so')

./WI_MatlabInterfaceInterface.so: /home/de11/matlab2021a/sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /home/de11/genmat/build.Release/libCore.so)

linux-vdso.so.1 (0x00007ffc9859e000)

libCore.so => /home/de11/genmat/build.Release/libCore.so (0x00007f5c3f31a000)

libMatlabDataArray.so => /home/de11/matlab2021a/bin/glnxa64/libMatlabDataArray.so (0x00007f5c3f2f4000)

libstdc++.so.6 => /home/de11/matlab2021a/sys/os/glnxa64/libstdc++.so.6 (0x00007f5c3ef71000)

libgcc_s.so.1 => /home/de11/matlab2021a/sys/os/glnxa64/libgcc_s.so.1 (0x00007f5c3ed59000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5c3eb5f000)

libpython3.8.so.1.0 => /lib/x86_64-linux-gnu/libpython3.8.so.1.0 (0x00007f5c3e607000)

libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f5c3e4b8000)

/lib64/ld-linux-x86-64.so.2 (0x00007f5c3f83d000)

libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f5c3e4b2000)

libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f5c3e48f000)

libexpat.so.1 => /home/de11/matlab2021a/bin/glnxa64/libexpat.so.1 (0x00007f5c3e464000)

libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f5c3e446000)

libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f5c3e441000)

ans =

0

[Sreevatsank K]

setenv LD_LIBRARY_PATH 'path/to/lib'

Can modify the LD_LIBRARY_PATH, and you can get system('ldd libname.so') to work. But this does not solve the original problem

[Trevor]

Is there a way to get more info on which library failed to load with this error on macos?

[Vladyslav]

For everyone who comes across this isuue,

setenv('LD_DEBUG', 'libs');

Prints which libraries cause errors to the terminal in which matlab is running.