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How to call external C++ function from Matlab

Asked by Cheng Lyu on 3 Jun 2019
Latest activity Edited by sjhstone
on 18 Jul 2019
I'm trying to call an external C++ function from Matlab to make it run faster.
I tried "coder.ceval", and got ERROR "The coder.ceval function is not supported in MATLAB"
I then tried "mex foo.cpp", and got ERROR "xcrun: error: SDK "macosx10.14.4" cannot be located"
I'm using "MacOS Mojave 10.14.5"
Does anybody know how to call C++ function from Matlab? Thank you sooooo much! I'm already driven crazy by this. T_T

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2 Answers

Answer by Sean de Wolski
on 3 Jun 2019

Starting in 19a, you can call C++ libraries directly in MATLAB: https://www.mathworks.com/help/releases/R2019a/matlab/call-cpp-library-functions.html

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Answer by Bobbie WU on 20 Jun 2019

I came across the same issue. Apparently, the mex command cannot find the SDK. I think the reason is that the SDK version has too much details (i.e. the 10.14.4 version number is unnecessary.)
To allow matlab to correctly locate the SDK, try the following command
mex SDKVER= foo.cpp
This basically sets the SDK version to null. It worked for me, hope that helps.

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Thanks for this easy fix! From my experience with MEX on Windows, some xml files must contain a specific SDK version target but it would a lot more complicated to modify the xml file that comes with MATLAB.
The xml files are located at
[matlabroot '/bin/maci64/mexopts']

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