How to build MSVC-compatible DLLs with g++ on Windows

Demo project that shows how to make an MSVC-compatible DLL that exposes some pure C functions with g++ on Windows.

source files:

• mtm.h is the interface header that will accompany your DLL
• stuff.h/ccp is some other example code that goes into the DLL
• demo.cpp is a small demo program that uses the DLL
• Makefile

files when built

• mtm.dll
• libmtm.a : import library for your DLL
• demo.exe : demo that uses your DLL, should execute the DLL function

deployment

If you want to deploy your DLL you should also make sure to provide the MinGW runtime DLLs. For the latest 64-bit MinGW-w64 these should be at least libstdc++6.dll, libwinpthread.dll and libgcc_s_seh.dll.

Build tested with

• MinGW-w64 g++ 4.9.2 32bit with dwarf exceptions on Windows 7, 64 bit, Powershell
• MinGW-w64 g++ 5.1.0 64bit with SEH on Windows 8.1, 64bit, Powershell

Tested in

• a Visual C# Express project
• a Visual C++ Express project
• an MS Excel 2013 VBA macro