Good luck writing anything but C89 with visual studio. This project sounds amazing and I'm going to probably try it but Microsoft has abandoned C for a while now so visual studio is a complete turn off for this use case.
I'm reasonably certain that this has started to change in MSVC 2013. They have stated that they have improved the C99 library support and unless I'm mistaken they have finally permitted mixed code and declarations.
They have implemented the C99 parts required by C++14 standard, plus few extra parts required by some well known open source projects. It remains open if they will ever implement the rest in MSVC++.