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MinGW-w64 Compiler

You can use the MinGW-w64 compiler to build MEX files and standalone MATLAB® engine and MAT-file applications. To install the compiler, use the Add-Ons menu described in Get Add-Ons. Search for MinGW or select from Features. For more information, see https://www.mathworks.com/matlabcentral/fileexchange/52848-matlab-support-for-mingw-w64-c-c++-compiler.

Building yprime.c Example

You can test the MinGW® compiler by building the yprime.c example. Copy the source file to a writable folder.

copyfile(fullfile(matlabroot,'extern','examples','mex','yprime.c'),'.','f')

If you only have the MinGW compiler installed on your system, the mex command automatically chooses MinGW. Go to the next step. However, if you have multiple C or C++ compilers, use mex -setup to choose MinGW.

mex -setup

Build the MEX file.

mex yprime.c

MATLAB displays a “Building with” message showing what compiler was used to build the MEX file.

Run the function.

yprime(1,1:4)

For more information, see Troubleshooting and Limitations Compiling C/C++ MEX Files with MinGW-w64.

MinGW Installation Folder Cannot Contain Space

Do not install MinGW in a location with spaces in the path name. For example, do not use:

C:\Program Files\mingw-64

Instead, use:

C:\mingw-64

Updating MEX Files to Use MinGW Compiler

If you have MEX source files built with a different MATLAB-supported compiler, you might need to modify the code in order to build with the MinGW compiler. For example:

  • Library (.lib) files generated by Microsoft® Visual Studio® are not compatible with MinGW.

  • Object cleanup is not possible when an exception is thrown using the mexErrMsgIdAndTxt function from C++ MEX files, resulting in memory leak.

  • An uncaught exception in C++ MEX files compiled with MinGW causes MATLAB to crash.

  • MEX files with variables containing large amounts of data cannot be compiled, as the compiler runs out of memory.

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