Is there a way to create fortran MEX files using Intel OneAPI?

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Yafet Menjetta
Yafet Menjetta on 20 Jul 2021
Edited: Vince Virgilio on 12 May 2022 at 21:33
I have some fortran codes that i need to turn into mex files for a project. The issue is that the fotran compiler i have on my mac (Intel OneAPI) is not supported by MATLAB and any other compiler that is supported is nott available anymore since OneAPI replaced Intell Parallel studio XE.
Is there a way to compile and create mex funtions using OneAPi as a compiler?
  1 Comment
luca guerrieri
luca guerrieri on 28 Apr 2022 at 18:08
I just installed the latest Intel Fortran, version 2021.5.0. I am running Monterey 12.3.1 and Matlab 2019b. I managed to compile a mex function combining a few tricks:
1) At the XQuartz prompt, I have to set the environmental variables for ifort by running the command
source /opt/intel/oneapi/setvars.sh
(Unfortunately, I have not found a good way to avoid running this command every time I want to use ifort.)
2) Start Matlab from XQuartz with the command
/Applications/MATLAB_R2019b.app/bin/matlab &
Here you will have to change the command depending on the version of Matlab you are using
3) grab the modified mex setup xml file attached here, unzip it and save it somewhere where you can find it again --- you can put it with the other setup files under /Applications/MATLAB_R2019b.app/bin/maci64/mexopts, or anywhere else.
The only change I had to make relative to the intel_fortran.xml file that came with the version of Matlab that I am running is at the end of the file. I jsut had to delete a line that was checking for the existence of a library that the latest versions of the linker will find even if they are not in the directory where they are supposed to be. I learned about this issue and solution on from a post on the Apple Developer Forum. This is the modified snippet of the XML file.
<CLANGRT_DIR>
<and>
<cmdReturns name="xcode-select -print-path"/>
<dirExists name="$$" />
</and>
</CLANGRT_DIR>
4) Use the xml file under 3 to run the mex setup with the following command:
mex -v -setup:/Applications/MATLAB_R2019b.app/bin/maci64/mexopts/intel_fortran_luca.xml
Of course, if you have saved it somewhere else, you need to change the path used above
5) Every other time you want to compile a mex function, you will have to repeat steps 1) and 2) above.

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Answers (1)

Anshika Chourasia
Anshika Chourasia on 11 Aug 2021
Edited: Anshika Chourasia on 11 Aug 2021
It is my understanding that R2021a doesn’t currently support Intel OneAPI.
Our developers are aware of the issue and the enhancement/support for Intel OneAPI might be considered for a future release of MATLAB.
  6 Comments
Vince Virgilio
Vince Virgilio on 12 May 2022 at 21:12
I also need mex to support Intel OneAPI Fortran, specifically version 2022.2.0173. Matlab 2022a does not appear to support it.

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