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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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38
compiler/rustc_typeck/src/collect.rs
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@ -1,3 +1,4 @@
// ignore-tidy-filelength
//! "Collection" is the process of determining the type and other external
//! details of each item in Rust. Collection is specifically concerned
//! with *inter-procedural* things -- for example, for a function
@ -2856,7 +2857,42 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
} else if attr.has_name(sym::rustc_std_internal_symbol) {
codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL;
} else if attr.has_name(sym::used) {
codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED;
let inner = attr.meta_item_list();
match inner.as_deref() {
Some([item]) if item.has_name(sym::linker) => {
if !tcx.features().used_with_arg {
feature_err(
&tcx.sess.parse_sess,
sym::used_with_arg,
attr.span,
"`#[used(linker)]` is currently unstable",
)
.emit();
}
codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED_LINKER;
}
Some([item]) if item.has_name(sym::compiler) => {
if !tcx.features().used_with_arg {
feature_err(
&tcx.sess.parse_sess,
sym::used_with_arg,
attr.span,
"`#[used(compiler)]` is currently unstable",
)
.emit();
}
codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED;
}
Some(_) => {
tcx.sess
.struct_span_err(
attr.span,
"expected `used`, `used(compiler)` or `used(linker)`",
)
.emit();
}
None => codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED,
}
} else if attr.has_name(sym::cmse_nonsecure_entry) {
if !matches!(tcx.fn_sig(id).abi(), abi::Abi::C { .. }) {
struct_span_err!(