Allow static and shared builds

[brechtsanders]

Will a shared library also be supported?

If you remove the STATIC argument from add_library() in CMakeLists.txt then the user can decide to build either a static or shared library bu supplying cmake parameter -DBUILD_SHARED_LIBS:BOOL=OFF or -DBUILD_SHARED_LIBS:BOOL=ON respectively.

Note that to support building a shared library (DLL) on Windows you will need to add the necessary __declspec(dllexport) and __declspec(dllimport) stuff for exported classes.

[dhorlick]

If we're not going to do this, then I recommend we either add set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS_INIT} -fPIC") or set target property POSITION_INDEPENDENT_CODE to True, to make it possible to link against midifile.a…

[craigsapp]

Allowing an easy way to compile dynamic or static library versions is a good idea. I don't program on Windows (and only occasionally work with cmake), so if you can provide a pull request (best) or demo code here, that functionality should be added. The library is so small I have not bothered using it as a dynamic library so for.

[dhorlick]

if you can provide a pull request (best) or demo code here, that functionality should be added

Done!

The library is so small I have not bothered using it as a dynamic library so for.

Indeed… since commenting, I decided it would be better not to dynamically link it into my own project, after all. 😄

Thanks for this library!