You can `rustc app.rs`, and do all the C Makefile stuff that way too (example in the kernel: https://github.com/Rust-for-Linux/linux/blob/rust/rust/Makefile htt

You can `rustc app.rs`, and do all the C Makefile stuff that way too (example in the kernel: https://github.com/Rust-for-Linux/linux/blob/rust/rust/Makefile https://github.com/Rust-for-Linux/linux/blob/rust/rust/Makef...). Nothing is forcing you to use Cargo except for convenience.