Auto merge of rust-lang#131662 - matthiaskrgr:rollup-r1wkfxw, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#130356 (don't warn about a missing change-id in CI)
 - rust-lang#130900 (Do not output () on empty description)
 - rust-lang#131066 (Add the Chinese translation entry to the RustByExample build process)
 - rust-lang#131067 (Fix std_detect links)
 - rust-lang#131644 (Clean up some Miri things in `sys/windows`)
 - rust-lang#131646 (sys/unix: add comments for some Miri fallbacks)
 - rust-lang#131653 (Remove const trait bound modifier hack)
 - rust-lang#131659 (enable `download_ci_llvm` test)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast_lowering/src/lib.rs

@@ -1327,14 +1327,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             // takes care of rejecting invalid modifier combinations and
                             // const trait bounds in trait object types.
                             GenericBound::Trait(ty, modifiers) => {
-                                // Still, don't pass along the constness here; we don't want to
-                                // synthesize any host effect args, it'd only cause problems.
-                                let modifiers = TraitBoundModifiers {
-                                    constness: BoundConstness::Never,
-                                    ..*modifiers
-                                };
-                                let trait_ref = this.lower_poly_trait_ref(ty, itctx, modifiers);
-                                let polarity = this.lower_trait_bound_modifiers(modifiers);
+                                let trait_ref = this.lower_poly_trait_ref(ty, itctx, *modifiers);
+                                let polarity = this.lower_trait_bound_modifiers(*modifiers);
                                 Some((trait_ref, polarity))
                             }
                             GenericBound::Outlives(lifetime) => {

library/std/src/sys/pal/unix/fs.rs

@@ -899,7 +899,7 @@ impl DirEntry {
             target_os = "android",
             target_os = "hurd"
         ),
-        not(miri)
+        not(miri) // no dirfd on Miri
     ))]
     pub fn metadata(&self) -> io::Result<FileAttr> {
         let fd = cvt(unsafe { dirfd(self.dir.dirp.0) })?;

library/std/src/sys/pal/windows/c.rs

@@ -175,9 +175,9 @@ extern "system" {
     pub fn WakeByAddressAll(address: *const c_void);
 }
 
+// These are loaded by `load_synch_functions`.
 #[cfg(target_vendor = "win7")]
 compat_fn_optional! {
-    crate::sys::compat::load_synch_functions();
     pub fn WaitOnAddress(
         address: *const c_void,
         compareaddress: *const c_void,

library/std/src/sys/pal/windows/compat.rs

@@ -198,11 +198,10 @@ macro_rules! compat_fn_with_fallback {
 
 /// Optionally loaded functions.
 ///
-/// Actual loading of the function defers to $load_functions.
+/// Relies on the functions being pre-loaded elsewhere.
 #[cfg(target_vendor = "win7")]
 macro_rules! compat_fn_optional {
-    ($load_functions:expr;
-    $(
+    ($(
         $(#[$meta:meta])*
         $vis:vis fn $symbol:ident($($argname:ident: $argtype:ty),*) $(-> $rettype:ty)?;
     )+) => (
@@ -221,9 +220,6 @@ macro_rules! compat_fn_optional {
 
                 #[inline(always)]
                 pub fn option() -> Option<F> {
-                    // Miri does not understand the way we do preloading
-                    // therefore load the function here instead.
-                    #[cfg(miri)] $load_functions;
                     NonNull::new(PTR.load(Ordering::Relaxed)).map(|f| unsafe { mem::transmute(f) })
                 }
             }

library/std/src/sys/pal/windows/mod.rs

@@ -346,7 +346,6 @@ pub fn abort_internal() -> ! {
     }
 }
 
-// miri is sensitive to changes here so check that miri is happy if touching this
 #[cfg(miri)]
 pub fn abort_internal() -> ! {
     crate::intrinsics::abort();

library/std/src/sys/sync/thread_parking/mod.rs

@@ -23,6 +23,7 @@ cfg_if::cfg_if! {
         mod windows7;
         pub use windows7::Parker;
     } else if #[cfg(all(target_vendor = "apple", not(miri)))] {
+        // Doesn't work in Miri, see <https://github.com/rust-lang/miri/issues/2589>.
         mod darwin;
         pub use darwin::Parker;
     } else if #[cfg(target_os = "xous")] {

src/bootstrap/src/bin/main.rs

@@ -14,6 +14,7 @@ use bootstrap::{
     Build, CONFIG_CHANGE_HISTORY, Config, Flags, Subcommand, find_recent_config_change_ids,
     human_readable_changes, t,
 };
+use build_helper::ci::CiEnv;
 
 fn main() {
     let args = env::args().skip(1).collect::<Vec<_>>();
@@ -54,9 +55,12 @@ fn main() {
         };
     }
 
-    // check_version warnings are not printed during setup
-    let changelog_suggestion =
-        if matches!(config.cmd, Subcommand::Setup { .. }) { None } else { check_version(&config) };
+    // check_version warnings are not printed during setup, or during CI
+    let changelog_suggestion = if matches!(config.cmd, Subcommand::Setup { .. }) || CiEnv::is_ci() {
+        None
+    } else {
+        check_version(&config)
+    };
 
     // NOTE: Since `./configure` generates a `config.toml`, distro maintainers will see the
     // changelog warning, not the `x.py setup` message.

src/bootstrap/src/core/build_steps/doc.rs

@@ -82,7 +82,7 @@ book!(
     EditionGuide, "src/doc/edition-guide", "edition-guide", &[], submodule;
     EmbeddedBook, "src/doc/embedded-book", "embedded-book", &[], submodule;
     Nomicon, "src/doc/nomicon", "nomicon", &[], submodule;
-    RustByExample, "src/doc/rust-by-example", "rust-by-example", &["ja"], submodule;
+    RustByExample, "src/doc/rust-by-example", "rust-by-example", &["ja", "zh"], submodule;
     RustdocBook, "src/doc/rustdoc", "rustdoc", &[];
     StyleGuide, "src/doc/style-guide", "style-guide", &[];
 );
@@ -718,6 +718,10 @@ fn doc_std(
         .arg("--target-dir")
         .arg(&*target_dir.to_string_lossy())
         .arg("-Zskip-rustdoc-fingerprint")
+        .arg("-Zrustdoc-map")
+        .rustdocflag("--extern-html-root-url")
+        .rustdocflag("std_detect=https://docs.rs/std_detect/latest/")
+        .rustdocflag("--extern-html-root-takes-precedence")
         .rustdocflag("--resource-suffix")
         .rustdocflag(&builder.version);
     for arg in extra_args {

src/bootstrap/src/core/config/tests.rs

@@ -10,6 +10,7 @@ use serde::Deserialize;
 use super::flags::Flags;
 use super::{ChangeIdWrapper, Config};
 use crate::core::build_steps::clippy::get_clippy_rules_in_order;
+use crate::core::build_steps::llvm;
 use crate::core::config::{LldMode, Target, TargetSelection, TomlConfig};
 
 pub(crate) fn parse(config: &str) -> Config {
@@ -19,13 +20,22 @@ pub(crate) fn parse(config: &str) -> Config {
     )
 }
 
-// FIXME: Resume this test after establishing a stabilized change tracking logic.
-#[ignore]
 #[test]
 fn download_ci_llvm() {
-    assert!(parse("").llvm_from_ci);
-    assert!(parse("llvm.download-ci-llvm = true").llvm_from_ci);
-    assert!(!parse("llvm.download-ci-llvm = false").llvm_from_ci);
+    let config = parse("");
+    let is_available = llvm::is_ci_llvm_available(&config, config.llvm_assertions);
+    if is_available {
+        assert!(config.llvm_from_ci);
+    }
+
+    let config = parse("llvm.download-ci-llvm = true");
+    let is_available = llvm::is_ci_llvm_available(&config, config.llvm_assertions);
+    if is_available {
+        assert!(config.llvm_from_ci);
+    }
+
+    let config = parse("llvm.download-ci-llvm = false");
+    assert!(!config.llvm_from_ci);
 
     let if_unchanged_config = parse("llvm.download-ci-llvm = \"if-unchanged\"");
     if if_unchanged_config.llvm_from_ci {

src/bootstrap/src/lib.rs

@@ -1575,9 +1575,11 @@ Executed at: {executed_at}"#,
     fn rust_version(&self) -> String {
         let mut version = self.rust_info().version(self, &self.version);
         if let Some(ref s) = self.config.description {
-            version.push_str(" (");
-            version.push_str(s);
-            version.push(')');
+            if !s.is_empty() {
+                version.push_str(" (");
+                version.push_str(s);
+                version.push(')');
+            }
         }
         version
     }