Unresolved import for SIMD types (CARGO_CFG_TARGET_FEATURE not evaluated?)

[hrydgard]

This builds and runs, but rust-analyzer is unhappy with the vec4 type:

Here's the (rather trivial) repro:

https://github.com/hrydgard/ra-vec4-repro

glam::Vec4 is a SIMD type:

/// A 4-dimensional vector.
///
/// This type is 16 byte aligned.
#[cfg(vec4_sse2)]
#[derive(Clone, Copy)]
#[repr(C)]
pub struct Vec4(pub(crate) __m128);

So my suspicion is that the vec4_sse2 option is not set, hiding the type.

The build.rs is what sets this option based on CARGO_CFG_TARGET_FEATURE.

What's the best way to deal with this as a user of glam-rs (or as the library author, to make rust-analyzer do the most sensible thing?)

I guess this is somewhat similar to #6038 ?

[bjorn3]

It should work if you enable loadOutDirsFromCheck.

{
    "rust-analyzer.cargo.loadOutDirsFromCheck": true,
}

I guess this is somewhat similar to #6038 ?

No, that is the cfg_if dependency of libstd being ignored.

[hrydgard]

Ah thanks, that does indeed take care of it. Though #6448 discusses the insecurity of the option (although when developing something with a build.rs, you'll end up running it whether you use rust-analyzer or not.. so not that big a difference)...

Wonder if glam-rs could somehow do this check without relying on a build.rs, but I'll take that issue over there.