Why does the mex command work for the example, but not for my code?

I am using R2015b. I installed MinGW using the add on explorer and tried out the example shown here: https://www.mathworks.com/help/matlab/ref/mex.html. After running the mex function, I get an output saying:"Building with 'MinGW64 Compiler (C)'. MEX completed successfully"

Then when I go to run my own mex function, I get an error: "Error using mex No supported compiler or SDK was found. You can install the freely available MinGW-w64 C/C++ compiler;"

This does not make sense to me, as I clearly have the MinGW compiler already installed and mex working correctly in other places. Why can't it find the compiler I have installed in this instance but not the other?

[Matt J]

I'm having the same problem in R2017b.

[Jan]

What exactly does this mean: "Then when I go to run my own mex function"?

[Shrirang Bhadgaonkar]

I am also facing the same issue. I can see MinGw64 as installed in Add-On Explorer but when I type mex -setup , Matlab does not lists MinGw64 in it. Please help. Thanks in advance.

Answer 1

[Shrirang Bhadgaonkar]

I found the solution to my problem. Check if it is also applicable to you. I found out that after enetering following command "mex -v -setup C", Matlab was skipping MinGW64 installaion because environmental variable"MW_MINGW64_LOC" was not SET. I had reinstalled the MinGw64 but still this vaiable was not on the ENV path. To set this variable in path I used the command and everything went fine. Happy Ending !!! please check the support package installation path. (Note : This is not Good Practice)

setenv('MW_MINGW64_LOC','C:\ProgramData\MATLAB\SupportPackages\R2017b\3P.instrset\mingw_w64.instrset')