Rust version conflict with winit/ahash

[hfytr]

so im just trying to render a triangle using ash, winit, and rust-gpu. the problem is that after downgrading my rust version (for rust-gpu) i get an error compiling ahash (which is dependancy of winit): ```error[E0658]: use of unstable library feature 'build_hasher_simple_hash_one'
--> /home/fbwdw/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ahash-0.8.11/src/random_state.rs:463:5
|
463 | / fn hash_one<T: Hash>(&self, x: T) -> u64 {
464 | | RandomState::hash_one(self, x)
465 | | }
| |_____^
|
= note: see issue #86161 rust-lang/rust#86161 for more information
= help: add #![feature(build_hasher_simple_hash_one)] to the crate attributes to enable

[schell]

I think the probably may be that you're inadvertently compiling some std code. rust-gpu is no_std only. A little care has to be taken to ensure that no std dependencies are in your build tree.

It looks like ahash does support no_std, but the std feature flag is on by default. You may have to use default_features = false in your Cargo.toml.

Let me know if that's not the case, or if I'm misunderstanding :)

[hfytr]

ahash is a dependancy of winit which is a dependancy of my non-shader code. this code just uses the shader, and is the top level crate in the structure described here: https://rust-gpu.github.io/rust-gpu/book/writing-shader-crates.html

[hfytr]

Ok, so now i have a setup with three crates: cpu code, shader-crate, shader compiler, with the latter two running an older rust version. The problem is that cargo doesn't detect the panic_handler and eh_personality. For some reason, i had to include

#![cfg_attr(target_arch = "spirv", no_std)]

in order to get rid of unimplemented panic / eh_personality errors. Everything works now.

[schell]

Oh, just for clarity - how is your project set up? Compiling shader crates is a no_std affair, but the graphics API side of that is completely different, and rust-gpu doesn't really need to be involved.

Just FYI that there is a tool that will help compile your shader crates called cargo-gpu that we maintain. It's still in alpha but it's quite useful.