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    <p><strong>EDIT: There seems to be a much better way with MinGW; see my other answer.</strong></p> <p>You can compile a <code>.mex</code> file using <code>gcc</code> if you have <code>Matlab</code> installed, from the command line. Some might say it's a little tedious the first time.</p> <p>First things first - what Matlab do you use? if it's 64-bits, <code>MinGW</code> won't help you, because it's 32-bit. I will therefore show how to use <a href="http://mingw-w64.sourceforge.net/" rel="nofollow">MinGW-w64</a> instead. Understanding how to do this with 32-bit <code>MinGW</code> should be straightforward.</p> <ol> <li>Add <code>C:\MinGW-64\bin\</code> to your path. You won't regret this :)</li> <li><p>Compile your <code>.c</code> files using <code>gcc</code>:</p> <pre><code>x86_64-w64-mingw32-c++ -m64 -shared -I"C:\Program Files\MATLAB\R2010b\extern\include" -o bla.mexw64 -DMATLAB_MEX_FILE -Wl,--export-all-symbols *.cpp </code></pre></li> <li><p>This will result in a bunch of linker errors, such as</p> <pre><code>undefined reference to `mexErrMsgTxt' </code></pre> <p>To solve this problem, you'll have to create an import library which connects with <code>libmex.dll</code>, <code>libmx.dll</code>, <code>libmat.dll</code> and <code>libeng.dll</code> (you might have others, but these are the main ones)</p></li> <li><p>List the functions you're missing, and, well, guess what <code>dll</code> they're coming from. Hint: <code>mexErrMsgTxt</code> is from <code>libmex.dll</code>, because it starts with "mex"...</p></li> <li><p>For every <code>dll</code> you need to export, create a <code>.def</code> file containing </p> <pre><code>EXPORTS ... relevant function names go here, such as mexErrMsgTxt, matOpen, etc. </code></pre></li> <li><p>Execute the following command, to create import libraries:</p> <pre><code>x86_64-w64-mingw32-dlltool -d libmx.def --dllname libmx.dll -l libmx.a </code></pre> <p>(Same for the rest of the <code>.def</code> files)</p></li> <li><p>Now you're good to go!</p> <pre><code>x86_64-w64-mingw32-c++ -m64 -shared -I"C:\..." -DMATLAB_MEX_FILE -o bla.mexw64 -Wl,--export-all-symbols *.cpp libmex.a libmx.a libmat.a libeng.a </code></pre></li> </ol> <p>Things which can be done better - instead of <code>--export-all-symbol</code>, only export <code>mexFunction</code> (requires creating another <code>.def</code> file, or adding "<code>__declspec(dllexport)</code>" before <code>void mexFunction(...)</code>).</p>
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    1. POUsing GCC (MinGW) as MATLAB's MEX compiler
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    1. COCrap, its 64 bit :(
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    2. COOk, I fixed the instructions (there are lots of fixes), and (ahem) actually did the thing and ran the result on Matlab - it seems to work for a simple `mex` file. It's actually quite exciting! I didn't know it's possible. And I didn't know that `MinGW64` exists and works. So thanks. :)
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    3. COThanks for your time mate.
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