Merge pull request #4742 from rust-lang/rustup-2025-12-05

Automatic Rustup

Author: oli-obk

.github/workflows/ci.yml

@@ -313,6 +313,7 @@ jobs:
     needs: [ calculate_matrix, job ]
     # !cancelled() executes the job regardless of whether the previous jobs passed or failed
     if: ${{ !cancelled() && contains(fromJSON('["auto", "try"]'), needs.calculate_matrix.outputs.run_type) }}
+    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto')) && 'bors') || '' }}
     steps:
       - name: checkout the source code
         uses: actions/checkout@v5

.mailmap

@@ -43,6 +43,7 @@ Andre Bogus <bogusandre@gmail.com>
 Andre Bogus <bogusandre@gmail.com> <andre.bogus@aleph-alpha.de>
 Andre Bogus <bogusandre@gmail.com> <andre.bogus@ankordata.de>
 Andrea Ciliberti <meziu210@icloud.com>
+
 Andreas Gal <gal@mozilla.com> <andreas.gal@gmail.com>
 Andreas Jonson <andjo403@users.noreply.github.com>
 Andrew Gauger <andygauge@gmail.com>
@@ -87,7 +88,9 @@ bjorn3 <17426603+bjorn3@users.noreply.github.com> <bjorn3@users.noreply.github.c
 bjorn3 <17426603+bjorn3@users.noreply.github.com> <bjorn3_gh@protonmail.com>
 Björn Steinbrink <bsteinbr@gmail.com> <B.Steinbrink@gmx.de>
 blake2-ppc <ulrik.sverdrup@gmail.com> <blake2-ppc>
-blyxyas <blyxyas@gmail.com> Alejandra González <blyxyas@gmail.com>
+Alejandra González <blyxyas@goose.love> blyxyas <blyxyas@gmail.com>
+Alejandra González <blyxyas@goose.love> blyxyas <blyxyas@goose.love>
+Alejandra González <blyxyas@goose.love> Alejandra González <blyxyas@gmail.com>
 boolean_coercion <booleancoercion@gmail.com>
 Boris Egorov <jightuse@gmail.com> <egorov@linux.com>
 bors <bors@rust-lang.org> bors[bot] <26634292+bors[bot]@users.noreply.github.com>

Cargo.lock

@@ -74,9 +74,9 @@ dependencies = [
 
 [[package]]
 name = "annotate-snippets"
-version = "0.12.9"
+version = "0.12.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a44baf24dd94e781f74dfe67ffee75a09a57971ddf0f615a178b4f6d404b48ff"
+checksum = "15580ece6ea97cbf832d60ba19c021113469480852c6a2a6beb0db28f097bf1f"
 dependencies = [
  "anstyle",
  "memchr",
@@ -3838,7 +3838,7 @@ dependencies = [
 name = "rustc_errors"
 version = "0.0.0"
 dependencies = [
- "annotate-snippets 0.12.9",
+ "annotate-snippets 0.12.10",
  "anstream",
  "anstyle",
  "derive_setters",

compiler/rustc_arena/src/lib.rs

@@ -10,13 +10,13 @@
 // tidy-alphabetical-start
 #![allow(clippy::mut_from_ref)] // Arena allocators are one place where this pattern is fine.
 #![allow(internal_features)]
+#![cfg_attr(bootstrap, feature(maybe_uninit_slice))]
 #![cfg_attr(test, feature(test))]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![doc(test(no_crate_inject, attr(deny(warnings), allow(internal_features))))]
 #![feature(core_intrinsics)]
 #![feature(decl_macro)]
 #![feature(dropck_eyepatch)]
-#![feature(maybe_uninit_slice)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
 #![feature(unwrap_infallible)]

compiler/rustc_ast_passes/messages.ftl

@@ -80,6 +80,8 @@ ast_passes_c_variadic_must_be_unsafe =
 ast_passes_c_variadic_no_extern = `...` is not supported for non-extern functions
     .help = only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
 
+ast_passes_c_variadic_not_supported = the `{$target}` target does not support c-variadic functions
+
 ast_passes_const_and_c_variadic = functions cannot be both `const` and C-variadic
     .const = `const` because of this
     .variadic = C-variadic because of this

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -710,6 +710,14 @@ impl<'a> AstValidator<'a> {
         match fn_ctxt {
             FnCtxt::Foreign => return,
             FnCtxt::Free | FnCtxt::Assoc(_) => {
+                if !self.sess.target.arch.supports_c_variadic_definitions() {
+                    self.dcx().emit_err(errors::CVariadicNotSupported {
+                        variadic_span: variadic_param.span,
+                        target: &*self.sess.target.llvm_target,
+                    });
+                    return;
+                }
+
                 match sig.header.ext {
                     Extern::Implicit(_) => {
                         if !matches!(sig.header.safety, Safety::Unsafe(_)) {
@@ -1067,7 +1075,7 @@ fn validate_generic_param_order(dcx: DiagCtxtHandle<'_>, generics: &[GenericPara
 
 impl<'a> Visitor<'a> for AstValidator<'a> {
     fn visit_attribute(&mut self, attr: &Attribute) {
-        validate_attr::check_attr(&self.sess.psess, attr, self.lint_node_id);
+        validate_attr::check_attr(&self.sess.psess, attr);
     }
 
     fn visit_ty(&mut self, ty: &'a Ty) {

compiler/rustc_ast_passes/src/errors.rs

@@ -733,6 +733,14 @@ pub(crate) struct CoroutineAndCVariadic {
     pub variadic_span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(ast_passes_c_variadic_not_supported)]
+pub(crate) struct CVariadicNotSupported<'a> {
+    #[primary_span]
+    pub variadic_span: Span,
+    pub target: &'a str,
+}
+
 #[derive(Diagnostic)]
 #[diag(ast_passes_pattern_in_foreign, code = E0130)]
 // FIXME: deduplicate with rustc_lint (`BuiltinLintDiag::PatternsInFnsWithoutBody`)

compiler/rustc_attr_parsing/src/attributes/cfg.rs

@@ -1,3 +1,5 @@
+use std::convert::identity;
+
 use rustc_ast::token::Delimiter;
 use rustc_ast::tokenstream::DelimSpan;
 use rustc_ast::{AttrItem, Attribute, CRATE_NODE_ID, LitKind, NodeId, ast, token};
@@ -353,7 +355,7 @@ pub fn parse_cfg_attr(
                 span,
                 attr_span: cfg_attr.span,
                 template: CFG_ATTR_TEMPLATE,
-                path: AttrPath::from_ast(&cfg_attr.get_normal_item().path),
+                path: AttrPath::from_ast(&cfg_attr.get_normal_item().path, identity),
                 description: ParsedDescription::Attribute,
                 reason,
                 suggestions: CFG_ATTR_TEMPLATE
@@ -398,6 +400,7 @@ fn parse_cfg_attr_internal<'a>(
                 .into_boxed_slice(),
             span: attribute.span,
         },
+        Some(attribute.get_normal_item().unsafety),
         ParsedDescription::Attribute,
         pred_span,
         CRATE_NODE_ID,

compiler/rustc_attr_parsing/src/attributes/cfg_select.rs

@@ -63,6 +63,7 @@ pub fn parse_cfg_select(
                     segments: vec![Ident::from_str("cfg_select")].into_boxed_slice(),
                     span: cfg_span,
                 },
+                None,
                 ParsedDescription::Macro,
                 cfg_span,
                 lint_node_id,

compiler/rustc_attr_parsing/src/interface.rs

@@ -1,7 +1,7 @@
 use std::borrow::Cow;
 
 use rustc_ast as ast;
-use rustc_ast::{AttrStyle, NodeId};
+use rustc_ast::{AttrStyle, NodeId, Safety};
 use rustc_errors::DiagCtxtHandle;
 use rustc_feature::{AttributeTemplate, Features};
 use rustc_hir::attrs::AttributeKind;
@@ -146,6 +146,7 @@ impl<'sess> AttributeParser<'sess, Early> {
             normal_attr.item.span(),
             attr.style,
             path.get_attribute_path(),
+            Some(normal_attr.item.unsafety),
             ParsedDescription::Attribute,
             target_span,
             target_node_id,
@@ -165,6 +166,7 @@ impl<'sess> AttributeParser<'sess, Early> {
         inner_span: Span,
         attr_style: AttrStyle,
         attr_path: AttrPath,
+        attr_safety: Option<Safety>,
         parsed_description: ParsedDescription,
         target_span: Span,
         target_node_id: NodeId,
@@ -181,14 +183,24 @@ impl<'sess> AttributeParser<'sess, Early> {
             sess,
             stage: Early { emit_errors },
         };
+        let mut emit_lint = |lint| {
+            crate::lints::emit_attribute_lint(&lint, sess);
+        };
+        if let Some(safety) = attr_safety {
+            parser.check_attribute_safety(
+                &attr_path,
+                inner_span,
+                safety,
+                &mut emit_lint,
+                target_node_id,
+            )
+        }
         let mut cx: AcceptContext<'_, 'sess, Early> = AcceptContext {
             shared: SharedContext {
                 cx: &mut parser,
                 target_span,
                 target_id: target_node_id,
-                emit_lint: &mut |lint| {
-                    crate::lints::emit_attribute_lint(&lint, sess);
-                },
+                emit_lint: &mut emit_lint,
             },
             attr_span,
             inner_span,
@@ -288,6 +300,15 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> {
                 // }
                 ast::AttrKind::Normal(n) => {
                     attr_paths.push(PathParser(Cow::Borrowed(&n.item.path)));
+                    let attr_path = AttrPath::from_ast(&n.item.path, lower_span);
+
+                    self.check_attribute_safety(
+                        &attr_path,
+                        lower_span(n.item.span()),
+                        n.item.unsafety,
+                        &mut emit_lint,
+                        target_id,
+                    );
 
                     let parts =
                         n.item.path.segments.iter().map(|seg| seg.ident.name).collect::<Vec<_>>();
@@ -301,7 +322,6 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> {
                         ) else {
                             continue;
                         };
-                        let path = parser.path();
                         let args = parser.args();
                         for accept in accepts {
                             let mut cx: AcceptContext<'_, 'sess, S> = AcceptContext {
@@ -312,11 +332,11 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> {
                                     emit_lint: &mut emit_lint,
                                 },
                                 attr_span: lower_span(attr.span),
-                                inner_span: lower_span(attr.get_normal_item().span()),
+                                inner_span: lower_span(n.item.span()),
                                 attr_style: attr.style,
                                 parsed_description: ParsedDescription::Attribute,
                                 template: &accept.template,
-                                attr_path: path.get_attribute_path(),
+                                attr_path: attr_path.clone(),
                             };
 
                             (accept.accept_fn)(&mut cx, args);
@@ -341,7 +361,7 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> {
                         // );
 
                         attributes.push(Attribute::Unparsed(Box::new(AttrItem {
-                            path: AttrPath::from_ast(&n.item.path),
+                            path: attr_path.clone(),
                             args: self.lower_attr_args(&n.item.args, lower_span),
                             id: HashIgnoredAttrId { attr_id: attr.id },
                             style: attr.style,