[beta] backport

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -2456,11 +2456,15 @@ impl<'a> Parser<'a> {
     }
 
     pub(crate) fn maybe_recover_unexpected_block_label(&mut self) -> bool {
-        let Some(label) = self.eat_label().filter(|_| {
-            self.eat(&token::Colon) && self.token.kind == token::OpenDelim(Delimiter::Brace)
-        }) else {
+        // Check for `'a : {`
+        if !(self.check_lifetime()
+            && self.look_ahead(1, |tok| tok.kind == token::Colon)
+            && self.look_ahead(2, |tok| tok.kind == token::OpenDelim(Delimiter::Brace)))
+        {
             return false;
-        };
+        }
+        let label = self.eat_label().expect("just checked if a label exists");
+        self.bump(); // eat `:`
         let span = label.ident.span.to(self.prev_token.span);
         let mut err = self.struct_span_err(span, "block label not supported here");
         err.span_label(span, "not supported here");

compiler/rustc_query_impl/src/on_disk_cache.rs

@@ -119,12 +119,11 @@ pub type EncodedDepNodeIndex = Vec<(SerializedDepNodeIndex, AbsoluteBytePos)>;
 struct SourceFileIndex(u32);
 
 #[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Encodable, Decodable)]
-pub struct AbsoluteBytePos(u32);
+pub struct AbsoluteBytePos(u64);
 
 impl AbsoluteBytePos {
     fn new(pos: usize) -> AbsoluteBytePos {
-        debug_assert!(pos <= u32::MAX as usize);
-        AbsoluteBytePos(pos as u32)
+        AbsoluteBytePos(pos.try_into().expect("Incremental cache file size overflowed u64."))
     }
 
     fn to_usize(self) -> usize {

compiler/rustc_resolve/src/lib.rs

@@ -1910,6 +1910,11 @@ impl<'a> Resolver<'a> {
         }
     }
 
+    /// For rustdoc.
+    pub fn get_partial_res(&self, node_id: NodeId) -> Option<PartialRes> {
+        self.partial_res_map.get(&node_id).copied()
+    }
+
     /// Retrieves the span of the given `DefId` if `DefId` is in the local crate.
     #[inline]
     pub fn opt_span(&self, def_id: DefId) -> Option<Span> {

compiler/rustc_trait_selection/src/traits/project.rs

@@ -508,7 +508,7 @@ impl<'a, 'b, 'tcx> TypeFolder<'tcx> for AssocTypeNormalizer<'a, 'b, 'tcx> {
             // This is really important. While we *can* handle this, this has
             // severe performance implications for large opaque types with
             // late-bound regions. See `issue-88862` benchmark.
-            ty::Opaque(def_id, substs) => {
+            ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {
                 // Only normalize `impl Trait` outside of type inference, usually in codegen.
                 match self.param_env.reveal() {
                     Reveal::UserFacing => ty.super_fold_with(self),

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -198,7 +198,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
             // This is really important. While we *can* handle this, this has
             // severe performance implications for large opaque types with
             // late-bound regions. See `issue-88862` benchmark.
-            ty::Opaque(def_id, substs) => {
+            ty::Opaque(def_id, substs) if !substs.has_escaping_bound_vars() => {
                 // Only normalize `impl Trait` outside of type inference, usually in codegen.
                 match self.param_env.reveal() {
                     Reveal::UserFacing => ty.try_super_fold_with(self),

compiler/rustc_trait_selection/src/traits/wf.rs

@@ -547,7 +547,7 @@ impl<'tcx> WfPredicates<'tcx> {
                 }
 
                 ty::FnDef(did, substs) => {
-                    let obligations = self.nominal_obligations(did, substs);
+                    let obligations = self.nominal_obligations_without_const(did, substs);
                     self.out.extend(obligations);
                 }
 

src/bootstrap/cc_detect.rs

@@ -47,8 +47,6 @@ fn cc2ar(cc: &Path, target: TargetSelection) -> Option<PathBuf> {
         Some(PathBuf::from("ar"))
     } else if target.contains("vxworks") {
         Some(PathBuf::from("wr-ar"))
-    } else if target.contains("android") {
-        Some(cc.parent().unwrap().join(PathBuf::from("llvm-ar")))
     } else {
         let parent = cc.parent().unwrap();
         let file = cc.file_name().unwrap().to_str().unwrap();
@@ -168,22 +166,13 @@ fn set_compiler(
         // compiler already takes into account the triple in question.
         t if t.contains("android") => {
             if let Some(ndk) = config.and_then(|c| c.ndk.as_ref()) {
-                let mut triple_iter = target.triple.split("-");
-                let triple_translated = if let Some(arch) = triple_iter.next() {
-                    let arch_new = match arch {
-                        "arm" | "armv7" | "armv7neon" | "thumbv7" | "thumbv7neon" => "armv7a",
-                        other => other,
-                    };
-                    std::iter::once(arch_new).chain(triple_iter).collect::<Vec<&str>>().join("-")
-                } else {
-                    target.triple.to_string()
-                };
-
-                // API 19 is the earliest API level supported by NDK r25b but AArch64 and x86_64 support
-                // begins at API level 21.
-                let api_level =
-                    if t.contains("aarch64") || t.contains("x86_64") { "21" } else { "19" };
-                let compiler = format!("{}{}-{}", triple_translated, api_level, compiler.clang());
+                let target = target
+                    .triple
+                    .replace("armv7neon", "arm")
+                    .replace("armv7", "arm")
+                    .replace("thumbv7neon", "arm")
+                    .replace("thumbv7", "arm");
+                let compiler = format!("{}-{}", target, compiler.clang());
                 cfg.compiler(ndk.join("bin").join(compiler));
             }
         }

src/ci/docker/host-x86_64/arm-android/Dockerfile

@@ -6,7 +6,7 @@ RUN sh /scripts/android-base-apt-get.sh
 
 COPY scripts/android-ndk.sh /scripts/
 RUN . /scripts/android-ndk.sh && \
-    download_ndk android-ndk-r25b-linux.zip
+    download_and_make_toolchain android-ndk-r15c-linux-x86_64.zip arm 14
 
 RUN dpkg --add-architecture i386 && \
     apt-get update && \
@@ -30,7 +30,7 @@ ENV PATH=$PATH:/android/sdk/platform-tools
 
 ENV TARGETS=arm-linux-androideabi
 
-ENV RUST_CONFIGURE_ARGS --arm-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/
+ENV RUST_CONFIGURE_ARGS --arm-linux-androideabi-ndk=/android/ndk/arm-14
 
 ENV SCRIPT python3 ../x.py --stage 2 test --host='' --target $TARGETS
 

src/ci/docker/host-x86_64/dist-android/Dockerfile

@@ -6,7 +6,14 @@ RUN sh /scripts/android-base-apt-get.sh
 # ndk
 COPY scripts/android-ndk.sh /scripts/
 RUN . /scripts/android-ndk.sh && \
-    download_ndk android-ndk-r25b-linux.zip
+    download_ndk android-ndk-r15c-linux-x86_64.zip && \
+    make_standalone_toolchain arm 14 && \
+    make_standalone_toolchain x86 14 && \
+    make_standalone_toolchain arm 21 && \
+    make_standalone_toolchain x86 21 && \
+    make_standalone_toolchain arm64 21 && \
+    make_standalone_toolchain x86_64 21 && \
+    remove_ndk
 
 # env
 ENV TARGETS=arm-linux-androideabi
@@ -19,12 +26,12 @@ ENV TARGETS=$TARGETS,x86_64-linux-android
 ENV RUST_CONFIGURE_ARGS \
       --enable-extended \
       --enable-profiler \
-      --arm-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
-      --armv7-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
-      --thumbv7neon-linux-androideabi-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
-      --i686-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
-      --aarch64-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
-      --x86_64-linux-android-ndk=/android/ndk/toolchains/llvm/prebuilt/linux-x86_64/ \
+      --arm-linux-androideabi-ndk=/android/ndk/arm-14 \
+      --armv7-linux-androideabi-ndk=/android/ndk/arm-14 \
+      --thumbv7neon-linux-androideabi-ndk=/android/ndk/arm-14 \
+      --i686-linux-android-ndk=/android/ndk/x86-14 \
+      --aarch64-linux-android-ndk=/android/ndk/arm64-21 \
+      --x86_64-linux-android-ndk=/android/ndk/x86_64-21 \
       --disable-docs
 
 ENV SCRIPT python3 ../x.py dist --host='' --target $TARGETS

src/ci/docker/scripts/android-ndk.sh

@@ -4,10 +4,28 @@ set -ex
 URL=https://dl.google.com/android/repository
 
 download_ndk() {
-    mkdir /android/
-    cd /android
+    mkdir -p /android/ndk
+    cd /android/ndk
     curl -fO $URL/$1
     unzip -q $1
     rm $1
     mv android-ndk-* ndk
 }
+
+make_standalone_toolchain() {
+    # See https://developer.android.com/ndk/guides/standalone_toolchain.htm
+    python3 /android/ndk/ndk/build/tools/make_standalone_toolchain.py \
+        --install-dir /android/ndk/$1-$2 \
+        --arch $1 \
+        --api $2
+}
+
+remove_ndk() {
+    rm -rf /android/ndk/ndk
+}
+
+download_and_make_toolchain() {
+    download_ndk $1 && \
+    make_standalone_toolchain $2 $3 && \
+    remove_ndk
+}

src/librustdoc/clean/utils.rs

@@ -7,7 +7,6 @@ use crate::clean::{
     PathSegment, Primitive, PrimitiveType, Type, TypeBinding, Visibility,
 };
 use crate::core::DocContext;
-use crate::formats::item_type::ItemType;
 use crate::visit_lib::LibEmbargoVisitor;
 
 use rustc_ast as ast;
@@ -504,9 +503,6 @@ pub(crate) fn register_res(cx: &mut DocContext<'_>, res: Res) -> DefId {
         return did;
     }
     inline::record_extern_fqn(cx, did, kind);
-    if let ItemType::Trait = kind {
-        inline::record_extern_trait(cx, did);
-    }
     did
 }
 

src/librustdoc/passes/collect_intra_doc_links/early.rs

@@ -354,7 +354,14 @@ impl Visitor<'_> for EarlyDocLinkResolver<'_, '_> {
             self.parent_scope.module = old_module;
         } else {
             match &item.kind {
-                ItemKind::Impl(box ast::Impl { of_trait: Some(..), .. }) => {
+                ItemKind::Impl(box ast::Impl { of_trait: Some(trait_ref), .. }) => {
+                    if let Some(partial_res) = self.resolver.get_partial_res(trait_ref.ref_id)
+                        && let Some(res) = partial_res.full_res()
+                        && let Some(trait_def_id) = res.opt_def_id()
+                        && !trait_def_id.is_local()
+                        && self.visited_mods.insert(trait_def_id) {
+                        self.resolve_doc_links_extern_impl(trait_def_id, false);
+                    }
                     self.all_trait_impls.push(self.resolver.local_def_id(item.id).to_def_id());
                 }
                 ItemKind::MacroDef(macro_def) if macro_def.macro_rules => {