How can I change default c++ compiler in MATLAB 2017b ?

So I have MATLAB2017b version. I want to use Matlab in combination with TwinCat to control some motors and sensors. I need Visual Studio 20XX to run the program.

I have installed VisualStudio 2013 professional and other versions of it, and also Visual Studio 2017. When I run "mex -setup" in Matlab, its says "MEX configured to use 'MinGW64 Compiler (C)' for C language compilation.". I cannot see any other languages from where I could choose except the default "MinGW64". I have looked at the compatibility issues as well and this version of Matlab should run perfectly with VisualStudio 2013 professional or a higher version. I have tried to install different versions and it still does not see it.

Can anyone offer a solution? I have been searching for days already and nothing has worked (including some patches I have found online).

[Walter Roberson]

Please show the output of

mex -v -setup c++

[Diana Becea]

this is the output:

 Verbose mode is on.
... Looking for compiler 'MinGW64 Compiler (C++)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\ProgramData\MATLAB\SupportPackages\R2017b\3P.instrset\mingw_w64.instrset').
... Looking for file 'C:\ProgramData\MATLAB\SupportPackages\R2017b\3P.instrset\mingw_w64.instrset\bin\g++.exe' ...Yes.
... Looking for folder 'C:\ProgramData\MATLAB\SupportPackages\R2017b\3P.instrset\mingw_w64.instrset' ...Yes.
Found installed compiler 'MinGW64 Compiler (C++)'.
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.
   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."

[Walter Roberson]

Try unsetting the environment variable MW_MINGW64_LOC

[Diana Becea]

I did this..

Now for "mex -setup"

I have this:

"Error using mex
No supported compiler or SDK was found. You can install the freely available MinGW-w64 C/C++ compiler;
see Install MinGW-w64 Compiler. For more options, visit http://www.mathworks.com/support/compilers."

and for : "mex -v -setup c++"

I have this:

"Verbose mode is on.
... Looking for compiler 'MinGW64 Compiler (C++)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...No.
Did not find installed compiler 'MinGW64 Compiler (C++)'.
Error using mex
No supported compiler or SDK was found. You can install the freely available MinGW-w64 C/C++ compiler;
see Install MinGW-w64 Compiler. For more options, visit http://www.mathworks.com/support/compilers."

.....But it still does not se the VisualStudio2013

Answer 1

[Kenny Shu]

The output of "mex -setup -v" should show the paths and registry settings MATLAB checks to find supported compilers.

The part of the output between "... Looking for compiler 'Microsoft Visual C++ 2013 Professional' ..." and "Did not find installed compiler 'Microsoft Visual C++ 2013 Professional'." should reveal why MATLAB is not detecting the VS2013 Compiler.

If this part is missing, then MATLAB may not be searching for the Visual Studio 2013 C++ Compiler.

Check that "msvc2013.xml" and "msvcpp2013.xml" exist in "MATLABROOT\bin\win64\mexopts" and that these files can be read by MATLAB:

f1 = fopen(fullfile(matlabroot, 'bin', 'win64', 'mexopts', 'msvcpp2013.xml'));
f2 = fopen(fullfile(matlabroot, 'bin', 'win64', 'mexopts', 'msvc2013.xml'));
l1 = textscan(f1, '%s', 1, 'delimiter', '\n', 'headerlines',2);
l2 = textscan(f2, '%s', 1, 'delimiter', '\n', 'headerlines',2);
l1{:}
l2{:}

If these files are missing, a re-install should restore them. If these files exist but cannot be accessed, check that MATLAB is running with administrative privileges.

[Diana Becea]

Thank you, Sir! You have saved me a lot of trouble! The files were missing. I just coppied them in the folder from another laptop!

Answer 2

[Bruno Luong]

It might not correctly detect if you install MSVS on drive other than C:

[Diana Becea]

I only have one partition on my laptop