Compiling the rand crate with rust

[ColinEberhardt]

I've just spotted that your rust code 'cheats' a little by using Math.random. The rand crate has a wasm branch that supports the wasm32-unknown-unknown target:

https://github.com/ColinEberhardt/wasm-rust-chip8/blob/master/Cargo.toml#L10

[boyanio]

Hey @ColinEberhardt Thanks for opening this issue. I had indeed some issues compiling the rand crate to WASM and that's why I decided to import JavaScript's randomizer. I tried to use the wasm branch you point to and it seems to compile fine. Unfortunately, I get the following error when calling the feelingLucky method:

wasm-0003c356-50:768 Uncaught RuntimeError: unreachable
    at wasm-function[50]:1578
    at wasm-function[2]:40
    at wasm-function[6]:454
    at wasm-function[1]:342
    at Object.feelingLucky (http://localhost:8080/js/index.js?v=2:47:49)
    ...

I created a separate branch with this. Do you have any idea why it fails?

[ColinEberhardt]

Just tested this with some of my own code, and se exactly the same failure. I'll raise an issue.

[metronom72]

I've thought that it was problem with js loader, but looks like that this is problem with resolve dependencies? But if use some another operation without rand code successful exec.

[boyanio]

@metronom72 exactly, the same here. I have now upgraded to version 4.2.1 of the official branch and the compilation works fine. Unfortunately, I still get error when calling the function. I think these issues are "known" and will be fixed in the next version (AFAIU from reading the issues on the repo)

[metronom72]

Thanks for answer. Will wait)

[boyanio]

After some years I have finally managed to do it ^_^