Invalid MEX-file: undefined symbol:_ZN​6matlab3me​x8Function​9getEngine​Ev

Hello,

I got a fresh install of MATLAB_R2024b with all toolboxes. After generating a .mexa64 file to avoid incompatibility between MATLAB and mex, I got the following error when trying to use the file. It seems to suggest a problem with either the .mexa64 file or the getEngine() function.

+ cmake --install mex-build-Release --prefix "mex-install" --component matlab
-- Install configuration: "Release"
-- Installing: /home/brent/Documents/eagle-8-students/Module_software/ANC/Simulator/mex-install/./MexControllers.mexa64
Invalid MEX-file '/home/brent/Documents/eagle-8-students/Module_software/ANC/Simulator/mex-install/MexControllers.mexa64':
/home/brent/Documents/eagle-8-students/Module_software/ANC/Simulator/mex-install/MexControllers.mexa64: undefined symbol:
_ZN6matlab3mex8Function9getEngineEv

Error in eaglesim.Control (line 123)
            MexControllers('new');
            ^^^^^^^^^^^^^^^^^^^^^
Error in study_controllers (line 56)
ctr = eaglesim.Control();
      ^^^^^^^^^^^^^^^^^^

Answer 1

[Saurabh]

hi @Brent,

This could possibly be the badly linked library. You probably need to add the appropriate library directory with a -L mex option and the specific library name with a -l (lower-case L) mex option.

Leverage the following MATLAB Answer thread to get help with this:

https://www.mathworks.com/matlabcentral/answers/33117-how-to-include-libraries-in-a-mex-file

I hope this helps.