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    <p>The following is how I was able to get MinGW to build a DLL to be used in Excel 2003 VBA.</p> <p><strong>fooBar.cpp</strong></p> <pre><code>int __stdcall Foo(int x) { return x * x; } double __stdcall Bar(double x) { return x * x; } </code></pre> <p>1) Start MinGW shell and create a directory called <code>fooBar</code> . Close the Excel Workbook (if open).</p> <pre><code>mkdir -p fooBar cd fooBar rm *.a *.dll *.def </code></pre> <p>2) Compile and generate a .def file - <strong><em>Note: this dll will not work because it has mangled symbols.</em></strong> </p> <pre><code>gcc -shared -o fooBar.dll fooBar.cpp -Wl,--output-def,fooBar.def,--out-implib,libfooBardll.a </code></pre> <p>The generated fooBar.def will look something like:</p> <pre><code>EXPORTS _Z3Bard@8 @1 _Z3Fooi@4 @2 </code></pre> <p>3) Modify the generated fooBar.def file by adding clean symbol aliases for the generated symbols. fooBar.def should now look something like:</p> <pre><code>EXPORTS _Z3Bard@8 @1 _Z3Fooi@4 @2 Bar = _Z3Bard@8 Foo = _Z3Fooi@4 </code></pre> <p>4) Cleaup again (except for the modified fooBar.def) </p> <pre><code>rm *.a *.dll </code></pre> <p>5) Compile with .def file with clean symbol aliases for the generated symbols.</p> <pre><code>gcc -shared -o fooBar.dll fooBar.cpp fooBar.def -Wl,--out-implib,libfooBar_dll.a </code></pre> <p>6) Open Excel and add the following VBA code <strong><em>(make sure to use the proper path, doubt it will have mmorris in it)</em></strong>:</p> <pre><code>Private Declare Function Foo Lib _ "C:\MinGW\msys\1.0\home\mmorris\fooBar\fooBar.dll" _ (ByVal x As Long) As Long Private Declare Function Bar Lib _ "C:\MinGW\msys\1.0\home\mmorris\fooBar\fooBar.dll" _ (ByVal x As Double) As Double </code></pre> <p>7) If you want to call the functions from an Excel Workbook, in a cell type <code>=Foo(5)</code> or <code>=Bar(5)</code></p>
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