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features must be additive

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This commit is contained in:
Ralf Jung 2023-11-13 09:41:45 +01:00
parent 5b5006916b
commit 6dd2ea0f35
1 changed files with 6 additions and 1 deletions
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7
compiler/rustc_codegen_ssa/src/target_features.rs
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@ -51,7 +51,12 @@ impl Stability {
// When adding features to the below lists
// 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
// if it doesn't, to_llvm_feature in llvm_util in rustc_codegen_llvm needs to be adapted.
//
// Also note that all target features listed here must be purely additive: for target_feature 1.1 to
// be sound, we can never allow features like `+soft-float` (on x86) to be controlled on a
// per-function level, since we would then allow safe calls from functions with `+soft-float` to
// functions without that feature!
//
// 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