Problem with linked library in a compiled MEX function

I'm attempting to use a compiled MEX function as part of some code for image analysis. I'm using MATLAB R2018a on an Ubuntu 16.04 machine. The function is compiled using the Intel C++ compiler, with the following command:

icc -c elipsoid_em_12.cpp -DMKL_ILP64 -fPIC -debug expr-source-pos -ftz -xHost -I$MATLAB_ROOT/extern/include -I$MKLROOT/include -O3 -fp-model fast=2 -DNDEBUG -qopt-matmul -axAVX -static -qopenmp-stubs

Then there is a command to create links to various Intel libraries:

icc -o elipsoid_em_12.mexa64 elipsoid_em_12.o -shared -L$MATLAB_ROOT/bin/glnxa64 -L$MKLROOT/lib/intel64 -lmx -lmex -lmat -lut -lstdc++ -Wl,--start-group ${MKLROOT}/lib/intel64/libmkl_intel_ilp64.a ${MKLROOT}/lib/intel64/libmkl_core.a ${MKLROOT}/lib/intel64/libmkl_intel_thread.a -Wl,--end-group -lpthread -lm

In these commands, $MATLAB_ROOT is the Matlab root directory (in /usr/local in my case), and $MKLROOT is the directory within the Intel System Studio 2018 tree that contains various MKL libraries. There are several of these, I'm using system_studio_2018/compilers_and_libraries.

The problem is that when the MEX function is called, a library called libirng.so is not found. This library is present in various spots in the System Studio directory, and I have tried adding it to the icc commands using -I and -L, but this does not work. I've also tried just directly copying it into bin/glnxa64 in the MATLAB directory. In this case, the library is found, but I get a different error message:

/usr/local/MATLAB/R2018a/bin/glnxa64/libirng.so: undefined symbol: __intel_skx_avx512_memcpy.

Not really sure what's going on here, so any tips would be much appreciated. Thanks!

Answer 1

[Kenny Shu]

The errors are likely occurring due to compiler incompatibilities with MATLAB R2018a.

Check that the supported version of GCC C/C++ is installed and enabled through "mex -setup". The supported compilers for R2018a can be found here .