rust-contract shows how to build a minimal rust contract.
The contract is composited by a entry.c file and a rust static library that actually implement the contract, check Makefile to see how to build the contract.
I'm failed to directly build a Rust binary that works on ckb-vm, However if you succeed to build a binary please send me a PR or open an issue!
Add riscv target:
rustup target add riscv64imac-unknown-none-elfUse make test to compile and run, try modify the contract youself.