--------
- [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
-- [Update to LLVM 14.0.0][95247]
-- [The `char` type is now described as UTF-8 (`DW_ATE_UTF`) in DWARF debuginfo][89887]
+- [The `char` type is now described as UTF-32 in debuginfo][89887]
- The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
-- [`#[target_feature = "adx"]` is now stable][93745]
-- [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
+- X86 [`#[target_feature = "adx"]` is now stable][93745]
Libraries
---------
- [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
-- [Windows paths longer than 260 chars are now supported in `process::Command` without needing explicit canonoicalization][92519]
- [`#[ignore = "…"]` messages are printed when running tests][92714]
-- [Consistently present absent stdio handles on Windows as NULL handles][93263]
-- [Make `std::io::stdio::lock()` return `'static` handles][93965]
+- [Consistently show absent stdio handles on Windows as NULL handles][93263]
+- [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users.
- [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
-- [Use cgroup quotas for calculating `available_parallelism` on Linux][92697]
+- [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4.
Stabilized APIs
---------------
-- [`From<&[T; N]>` for `Vec<T>`][95098]
-- [`From<&mut [T; N]>` for `Vec<T>`][95098]
-- [`Pin::static_mut`][93580]
-- [`Pin::static_ref`][93580]
-- [`Vec::retain_mut`][95491]
-- [`VecDeque::retain_mut`][95491]
-- [`Write` for `Cursor<[u8; N]>`][92663]
-- [`std::os::unix::net::SocketAddr::from_pathname`][94356]
-- [`std::process::ExitCode`][93840]
-- [`std::process::Termination`][93840]
-- [`std::thread::JoinHandle::is_finished`][95130]
+- [`Pin::static_mut`]
+- [`Pin::static_ref`]
+- [`Vec::retain_mut`]
+- [`VecDeque::retain_mut`]
+- [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
+- [`std::os::unix::net::SocketAddr::from_pathname`]
+- [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes.
+- [`std::thread::JoinHandle::is_finished`]
These APIs are now usable in const contexts:
-- [`*const T::offset` and `*mut T::offset`][93957]
-- [`*const T::wrapping_offset` and `*mut T::wrapping_offset`][93957]
-- [`*const T::add` and `*mut T::add`][93957]
-- [`*const T::sub` and `*mut T::sub`][93957]
-- [`*const T::wrapping_add` and `*mut T::wrapping_add`][93957]
-- [`*const T::wrapping_sub` and `*mut T::wrapping_sub`][93957]
-- [`[T]::as_mut_ptr`][93957]
-- [`[T]::as_ptr_range`][93957]
-- [`[T]::as_mut_ptr_range`][93957]
+- [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
+- [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
+- [`<*const T>::add` and `<*mut T>::add`][ptr-add]
+- [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
+- [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
+- [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
+- [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
+- [`<[T]>::as_ptr_range`][slice-as_ptr_range]
+- [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
Cargo
-----
Compatibility Notes
-------------------
-- [Disable `#[thread_local]` support on i686-pc-windows-msvc][95430]
+- Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to
+ - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
+ - (less common) or be updated to use the [`+whole-archive`] modifier.
+- [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
- [Proc macros no longer see `ident` matchers wrapped in groups][92472]
- [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
- [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
- [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
-- [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting][94295]
+- [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`.
- [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
Internal Changes
[90621]: https://github.com/rust-lang/rust/pull/90621/
[92285]: https://github.com/rust-lang/rust/pull/92285/
[92472]: https://github.com/rust-lang/rust/pull/92472/
-[92519]: https://github.com/rust-lang/rust/pull/92519/
-[92663]: https://github.com/rust-lang/rust/pull/92663/
[92697]: https://github.com/rust-lang/rust/pull/92697/
[92714]: https://github.com/rust-lang/rust/pull/92714/
[92911]: https://github.com/rust-lang/rust/pull/92911/
[93263]: https://github.com/rust-lang/rust/pull/93263/
-[93580]: https://github.com/rust-lang/rust/pull/93580/
[93745]: https://github.com/rust-lang/rust/pull/93745/
[93827]: https://github.com/rust-lang/rust/pull/93827/
-[93840]: https://github.com/rust-lang/rust/pull/93840/
[93901]: https://github.com/rust-lang/rust/pull/93901/
[93913]: https://github.com/rust-lang/rust/pull/93913/
-[93957]: https://github.com/rust-lang/rust/pull/93957/
[93965]: https://github.com/rust-lang/rust/pull/93965/
[94081]: https://github.com/rust-lang/rust/pull/94081/
[94261]: https://github.com/rust-lang/rust/pull/94261/
[94295]: https://github.com/rust-lang/rust/pull/94295/
-[94356]: https://github.com/rust-lang/rust/pull/94356/
[94832]: https://github.com/rust-lang/rust/pull/94832/
[95016]: https://github.com/rust-lang/rust/pull/95016/
-[95098]: https://github.com/rust-lang/rust/pull/95098/
-[95130]: https://github.com/rust-lang/rust/pull/95130/
-[95247]: https://github.com/rust-lang/rust/pull/95247/
[95251]: https://github.com/rust-lang/rust/pull/95251/
-[95430]: https://github.com/rust-lang/rust/pull/95430/
-[95491]: https://github.com/rust-lang/rust/pull/95491/
+[`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
+[`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
+[`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
+[`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
+[`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
+[`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
+[`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
+[`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
+[`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
[cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
+[cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
+[link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
+[ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
+[ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
+[ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
+[ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
+[ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
+[ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
+[slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
+[slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
+[slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
[target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
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