But... pretty much any language can interoperate with C, it's calling conventions have become the universal standard. I mean, I still remember at $previousJob when I was deprecating a C library and carefully searched for any mention of the include file... only to discover that a whole lot of Fortran code depended on the thing I was changing, and I had just broken all of it (since Fortran doesn't use include files the same way, my search for "#include <my_library" didn't return any hits, but the function calls were there none-the-less).

Julia, to use the great-great-grand-op's example, seems to also have a reasonably easy C interop (I've never written any Julia, so I'm basing this off skimming the docs, dunno, it might actually be much more of a pain than it looks like here).