!which gcc doesn't work

Hey, pretty new to Matlab here. I am trying to get matlab to work with matconvnet so I installed the -mex compiler support for Windows using Add-Ons.

Finally, did -mex setup and this gives

 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. You will be required
	 to update your code to utilize the new API.
	 You can find more information about this at:
	 https://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.

To choose a different language, select one from the following:
 mex -setup C++ 
 mex -setup FORTRAN
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. You will be required
	 to update your code to utilize the new API.

Now, I tried to do !which gcc to test which compiler am I using but it was giving an error that said

  >> !which gcc
'which' is not recognized as an internal or external command, 
operable program or batch file.

So, I figured it must be a windows thing so tried to setup a proper working which command. Installed GnuWin32 using SourceForge and downloaded the source packages but in command prompt, it still said which is not a recognized command.

Then, tried another workaround using echo

echo %~$PATH:1

and saving it as a which.cmd file under WindowsApp in Local. Now when I run !which gcc it says

>> !which gcc
 
C:\Users\User\Documents\Folder\matconvnet>echo   
ECHO is on. 

and that's it.

How do I check and confirm the default compiler on my Matlab is C++?

[Walter Roberson]

mex -v -setup C++

will show you where it is finding gcc.