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Guillaume Gomez
8bf58ee5d4
`rustc`: `target_features`: allow for `cfg`-only stable `target_features` This PR introduces a new stabilization level for `target_features`: `CfgOnlyStable`. The motivation is allowing the Rust compiler to expose `target_features` of targets so users can use `cfg(target_feature = "feature")` for conditional blocks depending on target features. However, `CfgOnlyStable` cannot be used for `#[target_feature(enable = "feature")]`, as this is still considered unstable. Accordingly, the compiler will still raise an error if these expressions are used on stable. This PR relates partially to rust-lang/rust#150257. As discussed, for RISC-V targets, having the `"d"`, `"e"`, and `"f"` target features exposed will allow baremetal developers to adapt the code depending on the target's properties. r? @RalfJung
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.