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Rust

The Rust project is built using Cargo which manages dependencies between the projects as well as external dependencies and allows for incremental compilation. The build configuration is defined in Cargo.toml.

Java Native Interface

Although the entry point of the Enso project is a Java archive, it can still make use of native libraries built in Rust trough the JVM foreign function interface (FFI) named Java Native Interface (JNI).

In order to generate a shared library, the Cargo.toml needs to enable compilation into a dynamic system library:

crate-type = ["cdylib"]

Invoking cargo build will then output the library into target/rust/debug with the extension .so on Linux, .dll on Windows and .dylib on macOS.

Then, to be able to load the library by System.loadLibrary("lib_name"), the Java application should be started with the option -Djava.library.path=path/to/lib_folder.