MATLAB 2018b cannot find Microsoft Visual C++ 2017 compiler when I run mex -setup

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Installed MS Visual C++ 2017 compiler but it does not show up when I run mex -setup
  2 Comments
Advait Thakre
Advait Thakre on 6 Dec 2021
>> mex -setup -v
Verbose mode is on.
... Looking for compiler 'Intel Parallel Studio XE 2015 with Microsoft Visual Studio 2015 (C)' ...
... Looking for environment variable 'ICPP_COMPILER15' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2015 with Microsoft Visual Studio 2015 (C)'.
... Looking for compiler 'Intel Parallel Studio XE 2016 with Microsoft Visual Studio 2015 (C)' ...
... Looking for environment variable 'ICPP_COMPILER16' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2016 with Microsoft Visual Studio 2015 (C)'.
... Looking for compiler 'Intel Parallel Studio XE 2017 with Microsoft Visual Studio 2015 (C)' ...
... Looking for environment variable 'ICPP_COMPILER17' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2017 with Microsoft Visual Studio 2015 (C)'.
... Looking for compiler 'Intel Parallel Studio XE 2017 with Microsoft Visual Studio 2017 (C)' ...
... Looking for environment variable 'ICPP_COMPILER17' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2017 with Microsoft Visual Studio 2017 (C)'.
... Looking for compiler 'Intel Parallel Studio XE 2018 with Microsoft Visual Studio 2015 (C)' ...
... Looking for environment variable 'ICPP_COMPILER18' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2018 with Microsoft Visual Studio 2015 (C)'.
... Looking for compiler 'Intel Parallel Studio XE 2018 with Microsoft Visual Studio 2017 (C)' ...
... Looking for environment variable 'ICPP_COMPILER18' ...No.
Did not find installed compiler 'Intel Parallel Studio XE 2018 with Microsoft Visual Studio 2017 (C)'.
... Looking for compiler 'MinGW64 Compiler (C)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\ProgramData\MATLAB\SupportPackages\R2018b\3P.instrset\mingw_w64.instrset').
... Looking for file 'C:\ProgramData\MATLAB\SupportPackages\R2018b\3P.instrset\mingw_w64.instrset\bin\gcc.exe' ...Yes.
... Looking for folder 'C:\ProgramData\MATLAB\SupportPackages\R2018b\3P.instrset\mingw_w64.instrset' ...Yes.
Found installed compiler 'MinGW64 Compiler (C)'.
... Looking for compiler 'Microsoft Visual C++ 2013 (C)' ...
... Looking for registry setting 'HKLM\SOFTWARE\Microsoft\VisualStudio\SxS\VS7' 12.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Microsoft\VisualStudio\SxS\VS7' 12.0 ...No.
... Looking for registry setting 'HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VS7' 12.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VS7' 12.0 ...No.
Did not find installed compiler 'Microsoft Visual C++ 2013 (C)'.
... Looking for compiler 'Microsoft Visual C++ 2015 (C)' ...
... Looking for registry setting 'HKLM\SOFTWARE\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
Did not find installed compiler 'Microsoft Visual C++ 2015 (C)'.
... Looking for compiler 'Microsoft Visual C++ 2017 (C)' ...
... Looking for registry setting 'HKLM\SOFTWARE\Microsoft\VisualStudio\SxS\VS7' 15.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Microsoft\VisualStudio\SxS\VS7' 15.0 ...No.
... Looking for registry setting 'HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VS7' 15.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VS7' 15.0 ...No.
Did not find installed compiler 'Microsoft Visual C++ 2017 (C)'.
... Looking for compiler 'MinGW64 Compiler (C)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\ProgramData\MATLAB\SupportPackages\R2018b\3P.instrset\mingw_w64.instrset').
... Looking for file 'C:\ProgramData\MATLAB\SupportPackages\R2018b\3P.instrset\mingw_w64.instrset\bin\gcc.exe' ...Yes.
... Looking for folder 'C:\ProgramData\MATLAB\SupportPackages\R2018b\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:
To choose a different language, select one from the following:
mex -setup C++
mex -setup FORTRAN

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Answers (1)

Kiran Felix Robert
Kiran Felix Robert on 9 Dec 2021
Hi Advait
By looking at the output from "mex -v -setup", the issue is caused by the Windows registry entry not pointing to the correct installation folder. Since we have stopped relying on the registry entry from Visual Studio 2019, we should not see such issues with VS 2019 and later versions of VS.
To resolve this issue for Visual Studio 2017 Professional, please reinstall (following the install instructions) in "C:\Program Files (x86)\Microsoft Visual Studio\2017" and run "mex -v -setup" in MATLAB.

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