Auto merge of #59226 - kennytm:rollup, r=kennytm

Rollup of 37 pull requests

Successful merges:

 - #58854 (appveyor: Use VS2017 for all our images)
 - #58855 (std: Spin for a global malloc lock on wasm32)
 - #58873 (Fix "Auto-hide item methods documentation" setting)
 - #58901 (Change `std::fs::copy` to use `copyfile` on MacOS and iOS)
 - #58933 (Move alloc::prelude::* to alloc::prelude::v1, make alloc a subset of std)
 - #58938 (core: ensure VaList passes improper_ctypes lint)
 - #58941 (MIPS: add r6 support)
 - #58949 (SGX target: Expose thread id function in os module)
 - #58959 (Add release notes for PR #56243)
 - #58976 (Default to integrated `rust-lld` linker for UEFI targets)
 - #59009 (Fix SGX implementations of read/write_vectored.)
 - #59025 (Fix generic argument lookup for Self)
 - #59036 (Fix ICE in MIR pretty printing)
 - #59037 (Avoid some common false positives in intra doc link checking)
 - #59072 (we can now skip should_panic tests with the libtest harness)
 - #59079 (add suggestions to invalid macro item error)
 - #59082 (A few improvements to comments in user-facing crates)
 - #59102 (Consistent naming for duration_float methods and additional f32 methods)
 - #59118 (rustc: fix ICE when trait alias has bare Self)
 - #59139 (Unregress using scalar unions in constants.)
 - #59146 (Suggest return lifetime when there's only one named lifetime)
 - #59147 (Make std time tests more robust for platform differences)
 - #59152 (Stabilize Range*::contains.)
 - #59156 ([wg-async-await] Add regression test for #55809.)
 - #59158 (Revert "Don't generate minification variable if minification disabled")
 - #59169 (Add `-Z allow_features=...` flag)
 - #59173 (bootstrap: Default to a sensible llvm-suffix.)
 - #59175 (Don't run test launching `echo` since that doesn't exist on Windows)
 - #59180 (Use try blocks in rustc_codegen_ssa)
 - #59185 (No old chestnuts in iter::repeat docs)
 - #59201 (Remove restriction on isize/usize in repr(simd))
 - #59204 (Output diagnostic information for rustdoc)
 - #59206 (Improved test output)
 - #59208 (Reduce a Code Repetition Related to Bit Operation)
 - #59212 (Add x86_64 musl host to the manifest)
 - #59221 (Option and Result: Add references to documentation of as_ref and as_mut)
 - #59231 (Stabilize Option::copied)

Author: bors

Diff for: RELEASES.md

@@ -110,8 +110,11 @@ Compatibility Notes
   methods instead.
 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
   downcasting.
+- [Libtest no longer creates a new thread for each test when
+  `--test-threads=1`.  It also runs the tests in deterministic order][56243]
 
 [55982]: https://github.com/rust-lang/rust/pull/55982/
+[56243]: https://github.com/rust-lang/rust/pull/56243
 [56303]: https://github.com/rust-lang/rust/pull/56303/
 [56351]: https://github.com/rust-lang/rust/pull/56351/
 [56362]: https://github.com/rust-lang/rust/pull/56362

Diff for: appveyor.yml

@@ -1,4 +1,7 @@
 environment:
+  # This is required for at least an AArch64 compiler in one image, and is also
+  # going to soon be required for compiling LLVM.
+  APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017 Preview
 
   # By default schannel checks revocation of certificates unlike some other SSL
   # backends, but we've historically had problems on CI where a revocation
@@ -81,7 +84,6 @@ environment:
     DIST_REQUIRE_ALL_TOOLS: 1
     DEPLOY: 1
     CI_JOB_NAME: dist-x86_64-msvc
-    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017 Preview
   - RUST_CONFIGURE_ARGS: >
       --build=i686-pc-windows-msvc
       --target=i586-pc-windows-msvc

Diff for: src/bootstrap/bin/rustdoc.rs

@@ -35,7 +35,7 @@ fn main() {
         .arg("--cfg")
         .arg("dox")
         .arg("--sysroot")
-        .arg(sysroot)
+        .arg(&sysroot)
         .env(bootstrap::util::dylib_path_var(),
              env::join_paths(&dylib_path).unwrap());
 
@@ -72,7 +72,13 @@ fn main() {
     }
 
     if verbose > 1 {
-        eprintln!("rustdoc command: {:?}", cmd);
+        eprintln!(
+            "rustdoc command: {:?}={:?} {:?}",
+            bootstrap::util::dylib_path_var(),
+            env::join_paths(&dylib_path).unwrap(),
+            cmd,
+        );
+        eprintln!("sysroot: {:?}", sysroot);
         eprintln!("libdir: {:?}", libdir);
     }
 

Diff for: src/bootstrap/builder.rs

@@ -408,11 +408,11 @@ impl<'a> Builder<'a> {
                 test::RustdocJSStd,
                 test::RustdocJSNotStd,
                 test::RustdocTheme,
+                test::RustdocUi,
                 // Run bootstrap close to the end as it's unlikely to fail
                 test::Bootstrap,
                 // Run run-make last, since these won't pass without make on Windows
                 test::RunMake,
-                test::RustdocUi
             ),
             Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
             Kind::Doc => describe!(

Diff for: src/bootstrap/lib.rs

@@ -241,6 +241,8 @@ pub struct Build {
     clippy_info: channel::GitInfo,
     miri_info: channel::GitInfo,
     rustfmt_info: channel::GitInfo,
+    in_tree_llvm_info: channel::GitInfo,
+    emscripten_llvm_info: channel::GitInfo,
     local_rebuild: bool,
     fail_fast: bool,
     doc_tests: DocTests,
@@ -363,6 +365,8 @@ impl Build {
         let clippy_info = channel::GitInfo::new(&config, &src.join("src/tools/clippy"));
         let miri_info = channel::GitInfo::new(&config, &src.join("src/tools/miri"));
         let rustfmt_info = channel::GitInfo::new(&config, &src.join("src/tools/rustfmt"));
+        let in_tree_llvm_info = channel::GitInfo::new(&config, &src.join("src/llvm-project"));
+        let emscripten_llvm_info = channel::GitInfo::new(&config, &src.join("src/llvm-emscripten"));
 
         let mut build = Build {
             initial_rustc: config.initial_rustc.clone(),
@@ -386,6 +390,8 @@ impl Build {
             clippy_info,
             miri_info,
             rustfmt_info,
+            in_tree_llvm_info,
+            emscripten_llvm_info,
             cc: HashMap::new(),
             cxx: HashMap::new(),
             ar: HashMap::new(),

Diff for: src/bootstrap/native.rs

@@ -18,6 +18,7 @@ use build_helper::output;
 use cmake;
 use cc;
 
+use crate::channel;
 use crate::util::{self, exe};
 use build_helper::up_to_date;
 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
@@ -231,7 +232,26 @@ impl Step for Llvm {
         }
 
         if let Some(ref suffix) = builder.config.llvm_version_suffix {
-            cfg.define("LLVM_VERSION_SUFFIX", suffix);
+            // Allow version-suffix="" to not define a version suffix at all.
+            if !suffix.is_empty() {
+                cfg.define("LLVM_VERSION_SUFFIX", suffix);
+            }
+        } else {
+            let mut default_suffix = format!(
+                "-rust-{}-{}",
+                channel::CFG_RELEASE_NUM,
+                builder.config.channel,
+            );
+            let llvm_info = if self.emscripten {
+                &builder.emscripten_llvm_info
+            } else {
+                &builder.in_tree_llvm_info
+            };
+            if let Some(sha) = llvm_info.sha_short() {
+                default_suffix.push_str("-");
+                default_suffix.push_str(sha);
+            }
+            cfg.define("LLVM_VERSION_SUFFIX", default_suffix);
         }
 
         if let Some(ref linker) = builder.config.llvm_use_linker {

Diff for: src/liballoc/prelude.rs

@@ -0,0 +1,16 @@
+//! The alloc Prelude
+//!
+//! The purpose of this module is to alleviate imports of commonly-used
+//! items of the `alloc` crate by adding a glob import to the top of modules:
+//!
+//! ```
+//! # #![allow(unused_imports)]
+//! # #![feature(alloc)]
+//! #![feature(alloc_prelude)]
+//! extern crate alloc;
+//! use alloc::prelude::v1::*;
+//! ```
+
+#![unstable(feature = "alloc_prelude", issue = "58935")]
+
+pub mod v1;

Diff for: src/liballoc/prelude/mod.rs

@@ -0,0 +1,11 @@
+//! The first version of the prelude of `alloc` crate.
+//!
+//! See the [module-level documentation](../index.html) for more.
+
+#![unstable(feature = "alloc_prelude", issue = "58935")]
+
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::borrow::ToOwned;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::boxed::Box;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::slice::SliceConcatExt;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::string::{String, ToString};
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::vec::Vec;

Diff for: src/liballoc/prelude/v1.rs

@@ -282,7 +282,7 @@ fn assert_covariance() {
 //
 // Destructors must be called exactly once per element.
 #[test]
-#[cfg(not(miri))] // Miri does not support panics
+#[cfg(not(miri))] // Miri does not support panics nor entropy
 fn panic_safe() {
     static DROP_COUNTER: AtomicUsize = AtomicUsize::new(0);
 

Diff for: src/liballoc/tests/binary_heap.rs

@@ -226,39 +226,34 @@ fn test_range_equal_empty_cases() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_range_equal_excluded() {
     let map: BTreeMap<_, _> = (0..5).map(|i| (i, i)).collect();
     map.range((Excluded(2), Excluded(2)));
 }
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_range_backwards_1() {
     let map: BTreeMap<_, _> = (0..5).map(|i| (i, i)).collect();
     map.range((Included(3), Included(2)));
 }
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_range_backwards_2() {
     let map: BTreeMap<_, _> = (0..5).map(|i| (i, i)).collect();
     map.range((Included(3), Excluded(2)));
 }
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_range_backwards_3() {
     let map: BTreeMap<_, _> = (0..5).map(|i| (i, i)).collect();
     map.range((Excluded(3), Included(2)));
 }
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_range_backwards_4() {
     let map: BTreeMap<_, _> = (0..5).map(|i| (i, i)).collect();
     map.range((Excluded(3), Excluded(2)));

Diff for: src/liballoc/tests/btree/map.rs

@@ -258,7 +258,6 @@ fn test_swap_remove() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_swap_remove_fail() {
     let mut v = vec![1];
     let _ = v.swap_remove(0);
@@ -632,7 +631,6 @@ fn test_insert() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_insert_oob() {
     let mut a = vec![1, 2, 3];
     a.insert(4, 5);
@@ -657,7 +655,6 @@ fn test_remove() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_remove_fail() {
     let mut a = vec![1];
     let _ = a.remove(0);
@@ -939,7 +936,6 @@ fn test_windowsator() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_windowsator_0() {
     let v = &[1, 2, 3, 4];
     let _it = v.windows(0);
@@ -964,7 +960,6 @@ fn test_chunksator() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_chunksator_0() {
     let v = &[1, 2, 3, 4];
     let _it = v.chunks(0);
@@ -989,7 +984,6 @@ fn test_chunks_exactator() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_chunks_exactator_0() {
     let v = &[1, 2, 3, 4];
     let _it = v.chunks_exact(0);
@@ -1014,7 +1008,6 @@ fn test_rchunksator() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_rchunksator_0() {
     let v = &[1, 2, 3, 4];
     let _it = v.rchunks(0);
@@ -1039,7 +1032,6 @@ fn test_rchunks_exactator() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_rchunks_exactator_0() {
     let v = &[1, 2, 3, 4];
     let _it = v.rchunks_exact(0);
@@ -1092,7 +1084,6 @@ fn test_vec_default() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_overflow_does_not_cause_segfault() {
     let mut v = vec![];
     v.reserve_exact(!0);
@@ -1102,7 +1093,6 @@ fn test_overflow_does_not_cause_segfault() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_overflow_does_not_cause_segfault_managed() {
     let mut v = vec![Rc::new(1)];
     v.reserve_exact(!0);
@@ -1278,7 +1268,6 @@ fn test_mut_chunks_rev() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_mut_chunks_0() {
     let mut v = [1, 2, 3, 4];
     let _it = v.chunks_mut(0);
@@ -1311,7 +1300,6 @@ fn test_mut_chunks_exact_rev() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_mut_chunks_exact_0() {
     let mut v = [1, 2, 3, 4];
     let _it = v.chunks_exact_mut(0);
@@ -1344,7 +1332,6 @@ fn test_mut_rchunks_rev() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_mut_rchunks_0() {
     let mut v = [1, 2, 3, 4];
     let _it = v.rchunks_mut(0);
@@ -1377,7 +1364,6 @@ fn test_mut_rchunks_exact_rev() {
 
 #[test]
 #[should_panic]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_mut_rchunks_exact_0() {
     let mut v = [1, 2, 3, 4];
     let _it = v.rchunks_exact_mut(0);
@@ -1411,7 +1397,7 @@ fn test_box_slice_clone() {
 #[test]
 #[allow(unused_must_use)] // here, we care about the side effects of `.clone()`
 #[cfg_attr(target_os = "emscripten", ignore)]
-#[cfg(not(miri))] // Miri does not support panics
+#[cfg(not(miri))] // Miri does not support threads nor entropy
 fn test_box_slice_clone_panics() {
     use std::sync::Arc;
     use std::sync::atomic::{AtomicUsize, Ordering};
@@ -1476,7 +1462,6 @@ fn test_copy_from_slice() {
 
 #[test]
 #[should_panic(expected = "destination and source slices have different lengths")]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_copy_from_slice_dst_longer() {
     let src = [0, 1, 2, 3];
     let mut dst = [0; 5];
@@ -1485,7 +1470,6 @@ fn test_copy_from_slice_dst_longer() {
 
 #[test]
 #[should_panic(expected = "destination and source slices have different lengths")]
-#[cfg(not(miri))] // Miri does not support panics
 fn test_copy_from_slice_dst_shorter() {
     let src = [0, 1, 2, 3];
     let mut dst = [0; 3];
@@ -1605,7 +1589,7 @@ thread_local!(static SILENCE_PANIC: Cell<bool> = Cell::new(false));
 
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)] // no threads
-#[cfg(not(miri))] // Miri does not support panics
+#[cfg(not(miri))] // Miri does not support threads nor entropy
 fn panic_safe() {
     let prev = panic::take_hook();
     panic::set_hook(Box::new(move |info| {