hello-gdext-wasm

Rust gdext wasm test project

Setup

(Full info at https://gist.github.com/PgBiel/ffa695a479ef4466cb24755db983950b)

1. Ensure you have nightly cargo installed through rustup

• E.g. rustup toolchain install nightly

2. Add the following to ~/.cargo/config.toml:

rustflags = [
    "-C", "target-feature=+atomics,+bulk-memory,+mutable-globals",
]

[unstable]
build-std = ["panic_abort", "std"]

The above will ensure the Rust standard library will be buit whenever using a nightly toolchain. This is necessary to use the flags listed above while compiling the standard library.

3. Ensure you have emsdk v3.1.45

• If you don't have it, you may follow these steps:
  1. Go to a directory where to install it
  2. git clone https://github.com/emscripten-core/emsdk.git
  3. cd emsdk
  4. ./emsdk install 3.1.45
  5. ./emsdk activate 3.1.45
  6. source ./emsdk_env.sh
  7. Confirm with emcc --version

4. Come back to this project's root folder with cd, and run cd rust
5. Run cargo +nightly build --target wasm32-unknown-emscripten to build the Rust code

• Note: cargo may ask you to run a rustup command to fetch the Rust standard library's source code. If prompted with a suggested rustup command, make sure to run it.

6. You can now open the godot/ folder in the Godot editor and attempt to export to the web.