bjoernager/rust
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Implement RFC 2951: Native link modifiers

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This commit implements both the native linking modifiers infrastructure
as well as an initial attempt at the individual modifiers from the RFC.
It also introduces a feature flag for the general syntax along with
individual feature flags for each modifier.
This commit is contained in:
Luqman Aden 2021-03-24 21:45:09 -07:00
parent bacf770f29
commit db555e1284
38 changed files with 829 additions and 170 deletions
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39
compiler/rustc_ast_passes/src/feature_gate.rs
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@ -326,6 +326,45 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
);
}
}
// Check for unstable modifiers on `#[link(..)]` attribute
if self.sess.check_name(attr, sym::link) {
for nested_meta in attr.meta_item_list().unwrap_or_default() {
if nested_meta.has_name(sym::modifiers) {
gate_feature_post!(
self,
native_link_modifiers,
nested_meta.span(),
"native link modifiers are experimental"
);
if let Some(modifiers) = nested_meta.value_str() {
for modifier in modifiers.as_str().split(',') {
if let Some(modifier) = modifier.strip_prefix(&['+', '-'][..]) {
macro_rules! gate_modifier { ($($name:literal => $feature:ident)*) => {
$(if modifier == $name {
let msg = concat!("`#[link(modifiers=\"", $name, "\")]` is unstable");
gate_feature_post!(
self,
$feature,
nested_meta.name_value_literal_span().unwrap(),
msg
);
})*
}}
gate_modifier!(
"bundle" => native_link_modifiers_bundle
"verbatim" => native_link_modifiers_verbatim
"whole-archive" => native_link_modifiers_whole_archive
"as-needed" => native_link_modifiers_as_needed
);
}
}
}
}
}
}
}
fn visit_item(&mut self, i: &'a ast::Item) {