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Error using mex 'No supported compiler was found' on Mac.

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Hannah West
Hannah West on 8 Jul 2019
Commented: Richard DeFazio on 1 Jul 2021
I am trying to run a c++ program in Matlab. To do this I am using mex. I have a mac.
I was trying to get my c++ files to run but that wasn't working so to begin with I have been trying to use this example provided by MATLAB: https://uk.mathworks.com/help/matlab/matlab_external/build-an-executable-mex-file.html
Each time I run the command 'mex timestwo.c' I recieve the same error as when I was trying to get my own programme to run. The error says:
'Warning: Xcode is installed, but its license has not been accepted. Run Xcode and accept its license agreement.
Error using mex
No supported compiler was found. For options, visit https://www.mathworks.com/support/compilers.'
This seems to be a very common problem and I have looked through all the guidance I can find but I am still recieving the same error. I have xcode 10.x and MATLAB 2019a and I have accepted the Xcode licence.
Thank you in advance
  2 Comments
Hannah West
Hannah West on 9 Jul 2019
Thanks Jan for the quick response. I am using Xcode Version 10.2.1 (10E1001). The output of 'mex -setup' is the same error I was receiving before.
'Warning: Xcode is installed, but its license has not been accepted. Run Xcode and accept its license agreement.
Error using mex
No supported compiler was found. For options, visit https://www.mathworks.com/support/compilers.'
But I have installed xcode and I have accepted the license.
Thanks
Hannah

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Answers (1)

Jan
Jan on 9 Jul 2019
Edited: Jan on 9 Jul 2019
Posting the error message offers new insights. Did you try this already - in a command shell of the operating system:
sudo xcodebuild -license accept
  4 Comments
Richard DeFazio
Richard DeFazio on 1 Jul 2021
Combining these two worked for me. Typing Hannah's second comment:
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
followed by Jan's comment:
sudo xcodebuild -license accept

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