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warn when using an unstable feature with -Ctarget-feature

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This commit is contained in:
Ralf Jung 2023-11-05 18:06:19 +01:00
parent 992943dbae
commit b85c6835d0
7 changed files with 64 additions and 23 deletions
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9
compiler/rustc_codegen_ssa/src/target_features.rs
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@ -23,6 +23,15 @@ pub const RUSTC_SPECIFIC_FEATURES: &[&str] = &["crt-static"];
// check whether they're named already elsewhere in rust
// e.g. in stdarch and whether the given name matches LLVM's
// if it doesn't, to_llvm_feature in llvm_util in rustc_codegen_llvm needs to be adapted
//
// When adding a new feature, be particularly mindful of features that affect function ABIs. Those
// need to be treated very carefully to avoid introducing unsoundness! This often affects features
// that enable/disable hardfloat support (see https://github.com/rust-lang/rust/issues/116344 for an
// example of this going wrong), but features enabling new SIMD registers are also a concern (see
// https://github.com/rust-lang/rust/issues/116558 for an example of this going wrong).
//
// Stabilizing a target feature (setting the 2nd component of the pair to `None`) requires t-lang
// approval.
const ARM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
// tidy-alphabetical-start