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Rollup merge of #91504 - cynecx:used_retain, r=nikic

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`#[used(linker)]` attribute

See https://github.com/dtolnay/linkme/issues/41#issuecomment-927255631.
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Matthias Krüger 2022-02-09 23:29:56 +01:00 • committed by GitHub
commit 3f4aaf4f2e
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16 changed files with 182 additions and 4 deletions
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2
compiler/rustc_feature/src/active.rs
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@ -531,6 +531,8 @@ declare_features! (
///
/// NOTE: A limited form of `union U { ... }` was accepted in 1.19.0.
(active, untagged_unions, "1.13.0", Some(55149), None),
/// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute.
(active, used_with_arg, "1.60.0", Some(93798), None),
/// Allows `extern "wasm" fn`
(active, wasm_abi, "1.53.0", Some(83788), None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!

2
compiler/rustc_feature/src/builtin_attrs.rs
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@ -324,7 +324,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
ungated!(export_name, Normal, template!(NameValueStr: "name"), FutureWarnPreceding),
ungated!(link_section, Normal, template!(NameValueStr: "name"), FutureWarnPreceding),
ungated!(no_mangle, Normal, template!(Word), WarnFollowing),
ungated!(used, Normal, template!(Word), WarnFollowing),
ungated!(used, Normal, template!(Word, List: "compiler|linker"), WarnFollowing),
// Limits:
ungated!(recursion_limit, CrateLevel, template!(NameValueStr: "N"), FutureWarnFollowing),