[ms013]

The Fortran language defines a pretty clean FFI to bind to other languages. It’s not really any harder than binding to C code, which is why it’s called BIND(C) and ISO_C_BINDING. That was introduced in F03. The only period when it was murky how to interoperate was in the 90s and early 00s when compiler vendors had their own array descriptor structures that didn’t agree with each other. I worked on a language interop tool back then and spent way more time than I’d have liked reverse engineering those undocumented data structures for all of the compilers at the time.