Auto merge of rust-lang#110919 - JohnTitor:rollup-9phs2vx, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - rust-lang#109702 (configure --set support list as arguments)
 - rust-lang#110620 (Document `const {}` syntax for `std::thread_local`.)
 - rust-lang#110721 (format panic message only once)
 - rust-lang#110881 (refactor(docs): remove macro resolution fallback)
 - rust-lang#110893 (remove inline const deadcode in typeck)
 - rust-lang#110898 (Remove unused std::sys_common::thread_local_key::Key)
 - rust-lang#110909 (Skip `rustc` version detection on macOS)

Failed merges:

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

Author: bors

Diff for: compiler/rustc_hir_typeck/src/lib.rs

@@ -221,12 +221,6 @@ fn typeck_with_fallback<'tcx>(
             }))
         } else if let Node::AnonConst(_) = node {
             match tcx.hir().get(tcx.hir().parent_id(id)) {
-                Node::Expr(&hir::Expr {
-                    kind: hir::ExprKind::ConstBlock(ref anon_const), ..
-                }) if anon_const.hir_id == id => Some(fcx.next_ty_var(TypeVariableOrigin {
-                    kind: TypeVariableOriginKind::TypeInference,
-                    span,
-                })),
                 Node::Ty(&hir::Ty { kind: hir::TyKind::Typeof(ref anon_const), .. })
                     if anon_const.hir_id == id =>
                 {

Diff for: library/std/src/sys_common/thread_local_key.rs

@@ -87,31 +87,6 @@ pub struct StaticKey {
     dtor: Option<unsafe extern "C" fn(*mut u8)>,
 }
 
-/// A type for a safely managed OS-based TLS slot.
-///
-/// This type allocates an OS TLS key when it is initialized and will deallocate
-/// the key when it falls out of scope. When compared with `StaticKey`, this
-/// type is entirely safe to use.
-///
-/// Implementations will likely, however, contain unsafe code as this type only
-/// operates on `*mut u8`, a raw pointer.
-///
-/// # Examples
-///
-/// ```ignore (cannot-doctest-private-modules)
-/// use tls::os::Key;
-///
-/// let key = Key::new(None);
-/// assert!(key.get().is_null());
-/// key.set(1 as *mut u8);
-/// assert!(!key.get().is_null());
-///
-/// drop(key); // deallocate this TLS slot.
-/// ```
-pub struct Key {
-    key: imp::Key,
-}
-
 /// Constant initialization value for static TLS keys.
 ///
 /// This value specifies no destructor by default.
@@ -194,39 +169,3 @@ impl StaticKey {
         }
     }
 }
-
-impl Key {
-    /// Creates a new managed OS TLS key.
-    ///
-    /// This key will be deallocated when the key falls out of scope.
-    ///
-    /// The argument provided is an optionally-specified destructor for the
-    /// value of this TLS key. When a thread exits and the value for this key
-    /// is non-null the destructor will be invoked. The TLS value will be reset
-    /// to null before the destructor is invoked.
-    ///
-    /// Note that the destructor will not be run when the `Key` goes out of
-    /// scope.
-    #[inline]
-    pub fn new(dtor: Option<unsafe extern "C" fn(*mut u8)>) -> Key {
-        Key { key: unsafe { imp::create(dtor) } }
-    }
-
-    /// See StaticKey::get
-    #[inline]
-    pub fn get(&self) -> *mut u8 {
-        unsafe { imp::get(self.key) }
-    }
-
-    /// See StaticKey::set
-    #[inline]
-    pub fn set(&self, val: *mut u8) {
-        unsafe { imp::set(self.key, val) }
-    }
-}
-
-impl Drop for Key {
-    fn drop(&mut self) {
-        unsafe { imp::destroy(self.key) }
-    }
-}

Diff for: library/std/src/sys_common/thread_local_key/tests.rs

@@ -1,24 +1,6 @@
-use super::{Key, StaticKey};
+use super::StaticKey;
 use core::ptr;
 
-fn assert_sync<T: Sync>() {}
-fn assert_send<T: Send>() {}
-
-#[test]
-fn smoke() {
-    assert_sync::<Key>();
-    assert_send::<Key>();
-
-    let k1 = Key::new(None);
-    let k2 = Key::new(None);
-    assert!(k1.get().is_null());
-    assert!(k2.get().is_null());
-    k1.set(ptr::invalid_mut(1));
-    k2.set(ptr::invalid_mut(2));
-    assert_eq!(k1.get() as usize, 1);
-    assert_eq!(k2.get() as usize, 2);
-}
-
 #[test]
 fn statik() {
     static K1: StaticKey = StaticKey::new(None);

Diff for: library/std/src/thread/local.rs

@@ -134,10 +134,28 @@ impl<T: 'static> fmt::Debug for LocalKey<T> {
 /// thread_local! {
 ///     pub static FOO: RefCell<u32> = RefCell::new(1);
 ///
-///     #[allow(unused)]
 ///     static BAR: RefCell<f32> = RefCell::new(1.0);
 /// }
-/// # fn main() {}
+///
+/// FOO.with(|foo| assert_eq!(*foo.borrow(), 1));
+/// BAR.with(|bar| assert_eq!(*bar.borrow(), 1.0));
+/// ```
+///
+/// This macro supports a special `const {}` syntax that can be used
+/// when the initialization expression can be evaluated as a constant.
+/// This can enable a more efficient thread local implementation that
+/// can avoid lazy initialization. For types that do not
+/// [need to be dropped][crate::mem::needs_drop], this can enable an
+/// even more efficient implementation that does not need to
+/// track any additional state.
+///
+/// ```
+/// use std::cell::Cell;
+/// thread_local! {
+///     pub static FOO: Cell<u32> = const { Cell::new(1) };
+/// }
+///
+/// FOO.with(|foo| assert_eq!(foo.get(), 1));
 /// ```
 ///
 /// See [`LocalKey` documentation][`std::thread::LocalKey`] for more

Diff for: src/bootstrap/bootstrap.py

@@ -209,19 +209,25 @@ def default_build_triple(verbose):
     # install, use their preference. This fixes most issues with Windows builds
     # being detected as GNU instead of MSVC.
     default_encoding = sys.getdefaultencoding()
-    try:
-        version = subprocess.check_output(["rustc", "--version", "--verbose"],
-                stderr=subprocess.DEVNULL)
-        version = version.decode(default_encoding)
-        host = next(x for x in version.split('\n') if x.startswith("host: "))
-        triple = host.split("host: ")[1]
-        if verbose:
-            print("detected default triple {} from pre-installed rustc".format(triple))
-        return triple
-    except Exception as e:
+
+    if sys.platform == 'darwin':
         if verbose:
-            print("pre-installed rustc not detected: {}".format(e))
+            print("not using rustc detection as it is unreliable on macOS")
             print("falling back to auto-detect")
+    else:
+        try:
+            version = subprocess.check_output(["rustc", "--version", "--verbose"],
+                    stderr=subprocess.DEVNULL)
+            version = version.decode(default_encoding)
+            host = next(x for x in version.split('\n') if x.startswith("host: "))
+            triple = host.split("host: ")[1]
+            if verbose:
+                print("detected default triple {} from pre-installed rustc".format(triple))
+            return triple
+        except Exception as e:
+            if verbose:
+                print("pre-installed rustc not detected: {}".format(e))
+                print("falling back to auto-detect")
 
     required = sys.platform != 'win32'
     ostype = require(["uname", "-s"], exit=required)

Diff for: src/bootstrap/bootstrap_test.py

@@ -112,6 +112,14 @@ def test_set_top_level(self):
         build = self.serialize_and_parse(["--set", "profile=compiler"])
         self.assertEqual(build.get_toml("profile"), 'compiler')
 
+    def test_set_codegen_backends(self):
+        build = self.serialize_and_parse(["--set", "rust.codegen-backends=cranelift"])
+        self.assertNotEqual(build.config_toml.find("codegen-backends = ['cranelift']"), -1)
+        build = self.serialize_and_parse(["--set", "rust.codegen-backends=cranelift,llvm"])
+        self.assertNotEqual(build.config_toml.find("codegen-backends = ['cranelift', 'llvm']"), -1)
+        build = self.serialize_and_parse(["--enable-full-tools"])
+        self.assertNotEqual(build.config_toml.find("codegen-backends = ['llvm']"), -1)
+
 if __name__ == '__main__':
     SUITE = unittest.TestSuite()
     TEST_LOADER = unittest.TestLoader()

Diff for: src/bootstrap/configure.py

@@ -153,8 +153,7 @@ def v(*args):
   "experimental LLVM targets to build")
 v("release-channel", "rust.channel", "the name of the release channel to build")
 v("release-description", "rust.description", "optional descriptive string for version output")
-v("dist-compression-formats", None,
-  "comma-separated list of compression formats to use")
+v("dist-compression-formats", None, "List of compression formats to use")
 
 # Used on systems where "cc" is unavailable
 v("default-linker", "rust.default-linker", "the default linker")
@@ -168,8 +167,8 @@ def v(*args):
 v("tools", None, "List of extended tools will be installed")
 v("codegen-backends", None, "List of codegen backends to build")
 v("build", "build.build", "GNUs ./configure syntax LLVM build triple")
-v("host", None, "GNUs ./configure syntax LLVM host triples")
-v("target", None, "GNUs ./configure syntax LLVM target triples")
+v("host", None, "List of GNUs ./configure syntax LLVM host triples")
+v("target", None, "List of GNUs ./configure syntax LLVM target triples")
 
 v("set", None, "set arbitrary key/value pairs in TOML configuration")
 
@@ -182,6 +181,11 @@ def err(msg):
     print("configure: error: " + msg)
     sys.exit(1)
 
+def is_value_list(key):
+    for option in options:
+        if option.name == key and option.desc.startswith('List of'):
+            return True
+    return False
 
 if '--help' in sys.argv or '-h' in sys.argv:
     print('Usage: ./configure [options]')
@@ -295,6 +299,8 @@ def set(key, value, config):
     parts = key.split('.')
     for i, part in enumerate(parts):
         if i == len(parts) - 1:
+            if is_value_list(part) and isinstance(value, str):
+                value = value.split(',')
             arr[part] = value
         else:
             if part not in arr:

Diff for: src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1295,7 +1295,8 @@ impl LinkCollector<'_, '_> {
                                 }
                             }
                         }
-                        resolution_failure(self, diag, path_str, disambiguator, smallvec![err])
+                        resolution_failure(self, diag, path_str, disambiguator, smallvec![err]);
+                        return vec![];
                     }
                 }
             }
@@ -1331,13 +1332,14 @@ impl LinkCollector<'_, '_> {
                     .fold(0, |acc, res| if let Ok(res) = res { acc + res.len() } else { acc });
 
                 if len == 0 {
-                    return resolution_failure(
+                    resolution_failure(
                         self,
                         diag,
                         path_str,
                         disambiguator,
                         candidates.into_iter().filter_map(|res| res.err()).collect(),
                     );
+                    return vec![];
                 } else if len == 1 {
                     candidates.into_iter().filter_map(|res| res.ok()).flatten().collect::<Vec<_>>()
                 } else {
@@ -1642,9 +1644,8 @@ fn resolution_failure(
     path_str: &str,
     disambiguator: Option<Disambiguator>,
     kinds: SmallVec<[ResolutionFailure<'_>; 3]>,
-) -> Vec<(Res, Option<DefId>)> {
+) {
     let tcx = collector.cx.tcx;
-    let mut recovered_res = None;
     report_diagnostic(
         tcx,
         BROKEN_INTRA_DOC_LINKS,
@@ -1736,19 +1737,25 @@ fn resolution_failure(
 
                         if !path_str.contains("::") {
                             if disambiguator.map_or(true, |d| d.ns() == MacroNS)
-                                && let Some(&res) = collector.cx.tcx.resolutions(()).all_macro_rules
-                                                             .get(&Symbol::intern(path_str))
+                                && collector
+                                    .cx
+                                    .tcx
+                                    .resolutions(())
+                                    .all_macro_rules
+                                    .get(&Symbol::intern(path_str))
+                                    .is_some()
                             {
                                 diag.note(format!(
                                     "`macro_rules` named `{path_str}` exists in this crate, \
                                      but it is not in scope at this link's location"
                                 ));
-                                recovered_res = res.try_into().ok().map(|res| (res, None));
                             } else {
                                 // If the link has `::` in it, assume it was meant to be an
                                 // intra-doc link. Otherwise, the `[]` might be unrelated.
-                                diag.help("to escape `[` and `]` characters, \
-                                           add '\\' before them like `\\[` or `\\]`");
+                                diag.help(
+                                    "to escape `[` and `]` characters, \
+                                           add '\\' before them like `\\[` or `\\]`",
+                                );
                             }
                         }
 
@@ -1854,11 +1861,6 @@ fn resolution_failure(
             }
         },
     );
-
-    match recovered_res {
-        Some(r) => vec![r],
-        None => Vec::new(),
-    }
 }
 
 fn report_multiple_anchors(cx: &DocContext<'_>, diag_info: DiagnosticInfo<'_>) {

Diff for: tests/rustdoc/issue-106142.rs

@@ -0,0 +1,14 @@
+// @has 'issue_106142/a/index.html'
+// @count 'issue_106142/a/index.html' '//ul[@class="item-table"]//li//a' 1
+
+#![allow(rustdoc::broken_intra_doc_links)]
+
+pub mod a {
+    /// [`m`]
+    pub fn f() {}
+
+    #[macro_export]
+    macro_rules! m {
+        () => {};
+    }
+}

Diff for: tests/ui/panics/fmt-only-once.rs

@@ -0,0 +1,21 @@
+// run-fail
+// check-run-results
+// exec-env:RUST_BACKTRACE=0
+
+// Test that we format the panic message only once.
+// Regression test for https://github.com/rust-lang/rust/issues/110717
+
+use std::fmt;
+
+struct PrintOnFmt;
+
+impl fmt::Display for PrintOnFmt {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        eprintln!("fmt");
+        f.write_str("PrintOnFmt")
+    }
+}
+
+fn main() {
+    panic!("{}", PrintOnFmt)
+}

Diff for: tests/ui/panics/fmt-only-once.run.stderr

@@ -0,0 +1,3 @@
+fmt
+thread 'main' panicked at 'PrintOnFmt', $DIR/fmt-only-once.rs:20:5
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace