Reminder: checking Windows builds is incredibly easy.

Most PostgreSQL developers don't use Windows, and many fairly openly regard the Windows port as a nuisance. But we've had it for more than a decade, now, and it's long since time we got over that. And checking that at least your changes compile is easy. It doesn't need a Windows box at all - Postgres builds for Windows quite happily via a cross-compiler. Here's exactly what I did on a Fedora 20 machine this morning:

sudo yum install mingw64-gcc mingw64-zlib
git clone git://git.postgresql.org/git/postgresql.git
cd postgresql
./configure --host=x86_64-w64-mingw32
make world

And it just worked. I tested it on Windows, and it might even be possible to test it using WINE, but even without testing it this procedure is useful to see if there are compilation errors.

I assume all this could be (and possibly has been) built for other platforms such as OSX and FreeBSD. If not, it might be worth putting together some packages for those platforms - it shouldn't be too hard.