I do not maintain cranelift, or any part of wasmtime. This is merely a redistribution of the abi in a c compatible way.
Here is the Source's license. wasmtime license
From what I can tell in the license, this is not necessarily a Derivative work, but I am treating it as a Derivative work, and being careful to shove this license in your face everywhere.
install this crate.
You can then install and run mozilla's cbindgen in order to generate the header files.
As this project uses opaque pointers to cranelifts structs, an additional header file with the types defined is necessary.
As a convenience, the header files can be taken from here. header files
If you are installing the latest crate of craneliftc, the headers are completely in sync.
updating your version of craneliftc will require copying the header files again from source.