MinGW compiler not recognising by MATLAB2015b even installed from Add On. how to install it correctly so that i do not get any error with command mex -setup

MinGW compiler not recognising by MATLAB2015b even installed from Add On. how to install it correctly so that i do not get any error with command mex -setup

[Subin Kuttappan Stellal Mary]

What is the output of the command :

mex -setup

It should show something like this after installing the compiler.

MEX configured to use 'MinGW64 Compiler (C)' for C language compilation.
Warning: The MATLAB C and Fortran API has changed to support MATLAB
   variables with more than 2^32-1 elements. In the near future
   you will be required to update your code to utilize the
   new API. You can find more information about this at:
   http://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.
To choose a different C compiler, select one from the following:
MinGW64 Compiler (C)  mex -setup:C:\Users\skuttapp\AppData\Roaming\MathWorks\MATLAB\R2015b\mex_C_win64.xml C
Microsoft Windows SDK 7.1 (C)  mex -setup:'C:\Program Files\MATLAB\R2015b\bin\win64\mexopts\winsdk-7.1_c.xml' C
To choose a different language, select one from the following:
 mex -setup C++ 
 mex -setup FORTRAN

[Christopher Davis]

I've had a similar issue.

https://www.mathworks.com/matlabcentral/answers/264853-trying-to-setup-mingw-4-9-2-for-mex

What happens when you call

 >> command = 'pwd';
 >> [status, cmdout] = system(command);