add x86-sse2 (32bit) ABI that requires SSE2 target feature by RalfJung · Pull Request #137037 · rust-lang/rust (original) (raw)

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This is the first commit of #135408:

The primary goal of this is to make SSE2 required for our i686 targets (at least for the ones that use Pentium 4 as their baseline), to ensure they cannot be affected by #114479. This has been MCPd in rust-lang/compiler-team#808, and is tracked in #133611.

We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (#135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.

r? @workingjubilee

try-job: aarch64-apple
try-job: aarch64-gnu
try-job: aarch64-gnu-debug
try-job: test-various
try-job: x86_64-gnu-nopt
try-job: dist-i586-gnu-i586-i686-musl

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r? @jieyouxu

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rustbot added O-apple

Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)

S-waiting-on-review

Status: Awaiting review from the assignee but also interested parties.

T-compiler

Relevant to the compiler team, which will review and decide on the PR/issue.

labels

Feb 14, 2025

The Miri subtree was changed

cc @rust-lang/miri

These commits modify compiler targets.
(See the Target Tier Policy.)

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 14, 2025

add x86-sse2 (32bit) ABI that requires SSE2 target feature

This is the first commit of rust-lang#135408:

The primary goal of this is to make SSE2 required for our i686 targets (at least for the ones that use Pentium 4 as their baseline), to ensure they cannot be affected by rust-lang#114479. This has been MCPd in rust-lang/compiler-team#808, and is tracked in rust-lang#133611.

We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (rust-lang#135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.

r? @workingjubilee

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl

r=me when try job comes back okay

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

bors added S-waiting-on-author

Status: This is awaiting some action (such as code changes or more information) from the author.

and removed S-waiting-on-review

Status: Awaiting review from the assignee but also interested parties.

labels

Feb 14, 2025

That try build seems to have just aborted mid-way through?

@bors try

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 14, 2025

add x86-sse2 (32bit) ABI that requires SSE2 target feature

This is the first commit of rust-lang#135408:

We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (rust-lang#135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.

r? @workingjubilee

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

/dev/sdb1       147G  4.1G  136G   3% /mnt
tmpfs           1.6G  4.0K  1.6G   1% /run/user/1001
================================================================================

Failed to stop mysql.service: Unit mysql.service not loaded.
##[error]Process completed with exit code 5.

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 14, 2025

add x86-sse2 (32bit) ABI that requires SSE2 target feature

This is the first commit of rust-lang#135408:

We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (rust-lang#135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.

r? @workingjubilee

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

/dev/sda15       98M  6.3M   92M   7% /boot/efi
tmpfs           1.6G  4.0K  1.6G   1% /run/user/1001
================================================================================

Failed to stop mysql.service: Unit mysql.service not loaded.
##[error]Process completed with exit code 5.

bors added S-waiting-on-review

Status: Awaiting review from the assignee but also interested parties.

and removed S-waiting-on-bors

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Feb 14, 2025

A job failed! Check out the build log: (web) (plain)

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/dev/sda15       98M  6.3M   92M   7% /boot/efi
tmpfs           1.6G  4.0K  1.6G   1% /run/user/1001
================================================================================

Failed to stop mysql.service: Unit mysql.service not loaded.
##[error]Process completed with exit code 5.

correction:
r=me when the sky stops falling

Going to approve it now even though it can't go in yet.

💡 This pull request was already approved, no need to approve it again.

This pull request previously failed. You should add more commits to fix the bug, or use retry to trigger a build again.
There's another pull request that is currently being tested, blocking this pull request: Implement f{16,32,64,128}::{erf,erfc} (#![feature(float_erf)]) #136324

📌 Commit 2eff215 has been approved by workingjubilee

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

bors added S-waiting-on-bors

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and removed S-waiting-on-review

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Feb 14, 2025

RalfJung added the relnotes

Marks issues that should be documented in the release notes of the next release.

label

Feb 14, 2025

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 15, 2025

…kingjubilee

Rollup of 10 pull requests

Successful merges:

rust-lang#133312 (triagebot: automatically add more rustdoc related labels)
rust-lang#134016 (Stabilize const_is_char_boundary and const_str_split_at.)
rust-lang#136971 (Add a new check-pass UI test for returning impl Fn(T) -> impl Trait)
rust-lang#136983 (Prepare standard library for Rust 2024 migration)
rust-lang#137002 (Fix early lint check desc in query)
rust-lang#137006 (borrowck diagnostics cleanup: remove an unused and a barely-used field)
rust-lang#137032 (Decode metadata buffer in one go)
rust-lang#137035 (Normalize closure instance before eagerly monomorphizing it)
rust-lang#137037 (add x86-sse2 (32bit) ABI that requires SSE2 target feature)
rust-lang#137038 (llvm: Tolerate captures in tests)

r? @ghost @rustbot modify labels: rollup

rust-timer added a commit to rust-lang-ci/rust that referenced this pull request

Feb 15, 2025

Rollup merge of rust-lang#137037 - RalfJung:x86-sse2-abi, r=workingjubilee

add x86-sse2 (32bit) ABI that requires SSE2 target feature

This is the first commit of rust-lang#135408:

We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (rust-lang#135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.

r? @workingjubilee

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 18, 2025

x86: use SSE2 to pass float and SIMD types

This builds on the new X86Sse2 ABI landed in rust-lang#137037 to actually make it a separate ABI from the default x86 ABI, and use SSE2 registers. Specifically, we use it in two ways: to return f64 values in a register rather than by-ptr, and to pass vectors of size up to 128bit in a register (or, well, whatever LLVM does when passing <4 x float> by-val, I don't actually know if this ends up in a register).

Cc @workingjubilee Fixes rust-lang#133611

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-msvc-1

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 18, 2025

x86: use SSE2 to pass float and SIMD types

Cc @workingjubilee Fixes rust-lang#133611

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-msvc-1

bors added a commit to rust-lang-ci/rust that referenced this pull request

Feb 19, 2025

x86: use SSE2 to pass float and SIMD types

Cc @workingjubilee Fixes rust-lang#133611

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-msvc-1

github-actions bot pushed a commit to rust-lang/miri that referenced this pull request

Feb 19, 2025

x86: use SSE2 to pass float and SIMD types

This builds on the new X86Sse2 ABI landed in rust-lang/rust#137037 to actually make it a separate ABI from the default x86 ABI, and use SSE2 registers. Specifically, we use it in two ways: to return f64 values in a register rather than by-ptr, and to pass vectors of size up to 128bit in a register (or, well, whatever LLVM does when passing <4 x float> by-val, I don't actually know if this ends up in a register).

Cc @workingjubilee Fixes #133611

try-job: aarch64-apple try-job: aarch64-gnu try-job: aarch64-gnu-debug try-job: test-various try-job: x86_64-gnu-nopt try-job: dist-i586-gnu-i586-i686-musl try-job: x86_64-msvc-1

wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request

Apr 9, 2025

Upstream changes relative to 1.85.1:

Version 1.86.0 (2025-04-03)

Language

[Stabilize upcasting trait objects to supertraits.] (rust-lang/rust#134367)
[Allow safe functions to be marked with the #[target_feature] attribute.] (rust-lang/rust#134090)
[The missing_abi lint now warns-by-default.] (rust-lang/rust#132397)
Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (--x) as written in other languages. This was previously a clippy lint, clippy::double_neg, and is [now available directly in Rust as double_negations.] (rust-lang/rust#126604)
[More pointers are now detected as definitely not-null based on their alignment in const eval.] (rust-lang/rust#133700)
[Empty repr() attribute applied to invalid items are now correctly rejected.] (rust-lang/rust#133925)
[Inner attributes #![test] and #![rustfmt::skip] are no longer accepted in more places than intended.] (rust-lang/rust#134276)

Compiler

[Debug-assert that raw pointers are non-null on access.] (rust-lang/rust#134424)
[Change -O to mean -C opt-level=3 instead of -C opt-level=2 to match Cargo's defaults.] (rust-lang/rust#135439)
[Fix emission of overflowing_literals under certain macro environments.] (rust-lang/rust#136393)

Platform Support

[Replace i686-unknown-redox target with i586-unknown-redox.] (rust-lang/rust#136698)
[Increase baseline CPU of i686-unknown-hurd-gnu to Pentium 4.] (rust-lang/rust#136700)
New tier 3 targets:
- [{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock] (rust-lang/rust#133631). For supporting Neutrino QNX 7.1 with io-socket network stack.
- [{aarch64-unknown,x86_64-pc}-nto-qnx800] (rust-lang/rust#133631). For supporting Neutrino QNX 8.0 (no_std-only).
- [{x86_64,i686}-win7-windows-gnu] (rust-lang/rust#134609). Intended for backwards compatibility with Windows 7. {x86_64,i686}-win7-windows-msvc are the Windows MSVC counterparts that already exist as Tier 3 targets.
- amdgcn-amd-amdhsa.
- x86_64-pc-cygwin.
- [{mips,mipsel}-mti-none-elf] (rust-lang/rust#135074). Initial bare-metal support.
- m68k-unknown-none-elf.
- [armv7a-nuttx-{eabi,eabihf}, aarch64-unknown-nuttx, and thumbv7a-nuttx-{eabi,eabihf}] (rust-lang/rust#135757).

Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

The type of FromBytesWithNulError in CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError> was [changed from an opaque struct to an enum] (rust-lang/rust#134143), allowing users to examine why the conversion failed.
[Remove RustcDecodable and RustcEncodable.] (rust-lang/rust#134272)
[Deprecate libtest's --logfile option.] (rust-lang/rust#134283)
[On recent versions of Windows, std::fs::remove_file will now remove read-only files.] (rust-lang/rust#134679)

Stabilized APIs

[{float}::next_down] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down)
[{float}::next_up] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up)
[<[_]>::get_disjoint_mut] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut)
[<[_]>::get_disjoint_unchecked_mut] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut)
[slice::GetDisjointMutError] (https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html)
[HashMap::get_disjoint_mut] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut)
[HashMap::get_disjoint_unchecked_mut] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut)
[NonZero::count_ones] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones)
[Vec::pop_if] (https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if)
[sync::Once::wait] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait)
[sync::Once::wait_force] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force)
[sync::OnceLock::wait] (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait)

These APIs are now stable in const contexts:

[hint::black_box] (https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
[io::Cursor::get_mut] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut)
[io::Cursor::set_position] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position)
[str::is_char_boundary] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary)
[str::split_at] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at)
[str::split_at_checked] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked)
[str::split_at_mut] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut)
[str::split_at_mut_checked] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked)

Cargo

[When merging, replace rather than combine configuration keys that refer to a program path and its arguments.] (rust-lang/cargo#15066)
[Error if both --package and --workspace are passed but the requested package is missing.] (rust-lang/cargo#15071) This was previously silently ignored, which was considered a bug since missing packages should be reported.
[Deprecate the token argument in cargo login to avoid shell history leaks.] (rust-lang/cargo#15057)
[Simplify the implementation of SourceID comparisons.] (rust-lang/cargo#14980) This may potentially change behavior if the canonicalized URL compares differently in alternative registries.

Rustdoc

[Add a sans-serif font setting.] (rust-lang/rust#133636)

Compatibility Notes

[The wasm_c_abi future compatibility warning is now a hard error.] (rust-lang/rust#133951) Users of wasm-bindgen should upgrade to at least version 0.2.89, otherwise compilation will fail.
[Remove long-deprecated no-op attributes #![no_start] and #![crate_id].] (rust-lang/rust#134300)
[The future incompatibility lint cenum_impl_drop_cast has been made into a hard error.] (rust-lang/rust#135964) This means it is now an error to cast a field-less enum to an integer if the enum implements Drop.
[SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.] (rust-lang/rust#137037) To compile for pre-SSE2 32-bit x86, use a "i586" target instead.

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

[Build the rustc on AArch64 Linux with ThinLTO + PGO.] (rust-lang/rust#133807) The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.

tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request

May 10, 2025

This MR contains the following updates:

Package	Update	Change
rust	minor	`1.85.1` -> `1.86.0`

MR created with the help of el-capitano/tools/renovate-bot.

Proposed changes to behavior should be submitted there as MRs.

Release Notes

rust-lang/rust (rust)

`v1.86.0`

Compare Source

==========================

Language

Stabilize upcasting trait objects to supertraits.
Allow safe functions to be marked with the #[target_feature] attribute.
The missing_abi lint now warns-by-default.
Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (--x) as written in other languages. This was previously a clippy lint, clippy::double_neg, and is now available directly in Rust as double_negations.
More pointers are now detected as definitely not-null based on their alignment in const eval.
Empty repr() attribute applied to invalid items are now correctly rejected.
Inner attributes #![test] and #![rustfmt::skip] are no longer accepted in more places than intended.

Compiler

Platform Support

Replace i686-unknown-redox target with i586-unknown-redox.
Increase baseline CPU of i686-unknown-hurd-gnu to Pentium 4.
New tier 3 targets:
- {aarch64-unknown,x86_64-pc}-nto-qnx710_iosock. For supporting Neutrino QNX 7.1 with io-socket network stack.
- {aarch64-unknown,x86_64-pc}-nto-qnx800. For supporting Neutrino QNX 8.0 (no_std-only).
- {x86_64,i686}-win7-windows-gnu. Intended for backwards compatibility with Windows 7. {x86_64,i686}-win7-windows-msvc are the Windows MSVC counterparts that already exist as Tier 3 targets.
- amdgcn-amd-amdhsa.
- x86_64-pc-cygwin.
- {mips,mipsel}-mti-none-elf. Initial bare-metal support.
- m68k-unknown-none-elf.
- armv7a-nuttx-{eabi,eabihf}, aarch64-unknown-nuttx, and thumbv7a-nuttx-{eabi,eabihf}.

Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

The type of FromBytesWithNulError in CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError> was changed from an opaque struct to an enum, allowing users to examine why the conversion failed.
Remove RustcDecodable and RustcEncodable.
Deprecate libtest's --logfile option.
On recent versions of Windows, std::fs::remove_file will now remove read-only files.

Stabilized APIs

These APIs are now stable in const contexts:

Cargo

When merging, replace rather than combine configuration keys that refer to a program path and its arguments.
Error if both --package and --workspace are passed but the requested package is missing. This was previously silently ignored, which was considered a bug since missing packages should be reported.
Deprecate the token argument in cargo login to avoid shell history leaks.
Simplify the implementation of SourceID comparisons. This may potentially change behavior if the canonicalized URL compares differently in alternative registries.

Rustdoc

Add a sans-serif font setting.

Compatibility Notes

The wasm_c_abi future compatibility warning is now a hard error. Users of wasm-bindgen should upgrade to at least version 0.2.89, otherwise compilation will fail.
Remove long-deprecated no-op attributes #![no_start] and #![crate_id].
The future incompatibility lint cenum_impl_drop_cast has been made into a hard error. This means it is now an error to cast a field-less enum to an integer if the enum implements Drop.
SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually. To compile for pre-SSE2 32-bit x86, use a "i586" target instead.

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

Build the rustc on AArch64 Linux with ThinLTO + PGO. The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

If you want to rebase/retry this MR, check this box

This MR has been generated by Renovate Bot.

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request

Jun 16, 2025

Pkgsrc changes:

Drop support for building now old 1.76.0 rust natively on 32-bit NetBSD arm ports, pushing those to use the rust-bin variant instead.
Use of newer GCC on NetBSD/powerpc turned out to not be required, given that your kernel and user-land is new enough. >= 10.0 release?
Checksum updates.

Upstream changes:

Version 1.86.0 (2025-04-03)

Language

[Stabilize upcasting trait objects to supertraits.] (rust-lang/rust#134367)
[Allow safe functions to be marked with the #[target_feature] attribute.] (rust-lang/rust#134090)
[The missing_abi lint now warns-by-default.] (rust-lang/rust#132397)
Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (--x) as written in other languages. This was previously a clippy lint, clippy::double_neg, and is [now available directly in Rust as double_negations.] (rust-lang/rust#126604)
[More pointers are now detected as definitely not-null based on their alignment in const eval.] (rust-lang/rust#133700)
[Empty repr() attribute applied to invalid items are now correctly rejected.] (rust-lang/rust#133925)
[Inner attributes #![test] and #![rustfmt::skip] are no longer accepted in more places than intended.] (rust-lang/rust#134276)

Compiler

[Debug-assert that raw pointers are non-null on access.] (rust-lang/rust#134424)
[Change -O to mean -C opt-level=3 instead of -C opt-level=2 to match Cargo's defaults.] (rust-lang/rust#135439)
[Fix emission of overflowing_literals under certain macro environments.] (rust-lang/rust#136393)

Platform Support

[Replace i686-unknown-redox target with i586-unknown-redox.] (rust-lang/rust#136698)
[Increase baseline CPU of i686-unknown-hurd-gnu to Pentium 4.] (rust-lang/rust#136700)
New tier 3 targets:
- [{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock] (rust-lang/rust#133631). For supporting Neutrino QNX 7.1 with io-socket network stack.
- [{aarch64-unknown,x86_64-pc}-nto-qnx800] (rust-lang/rust#133631). For supporting Neutrino QNX 8.0 (no_std-only).
- [{x86_64,i686}-win7-windows-gnu] (rust-lang/rust#134609). Intended for backwards compatibility with Windows 7. {x86_64,i686}-win7-windows-msvc are the Windows MSVC counterparts that already exist as Tier 3 targets.
- amdgcn-amd-amdhsa.
- x86_64-pc-cygwin.
- [{mips,mipsel}-mti-none-elf] (rust-lang/rust#135074). Initial bare-metal support.
- m68k-unknown-none-elf.
- [armv7a-nuttx-{eabi,eabihf}, aarch64-unknown-nuttx, and thumbv7a-nuttx-{eabi,eabihf}] (rust-lang/rust#135757).

Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

The type of FromBytesWithNulError in CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError> was [changed from an opaque struct to an enum] (rust-lang/rust#134143), allowing users to examine why the conversion failed.
[Remove RustcDecodable and RustcEncodable.] (rust-lang/rust#134272)
[Deprecate libtest's --logfile option.] (rust-lang/rust#134283)
[On recent versions of Windows, std::fs::remove_file will now remove read-only files.] (rust-lang/rust#134679)

Stabilized APIs

[{float}::next_down] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down)
[{float}::next_up] (https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up)
[<[_]>::get_disjoint_mut] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut)
[<[_]>::get_disjoint_unchecked_mut] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut)
[slice::GetDisjointMutError] (https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html)
[HashMap::get_disjoint_mut] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut)
[HashMap::get_disjoint_unchecked_mut] (https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut)
[NonZero::count_ones] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones)
[Vec::pop_if] (https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if)
[sync::Once::wait] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait)
[sync::Once::wait_force] (https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force)
[sync::OnceLock::wait] (https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait)

These APIs are now stable in const contexts:

[hint::black_box] (https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
[io::Cursor::get_mut] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut)
[io::Cursor::set_position] (https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position)
[str::is_char_boundary] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary)
[str::split_at] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at)
[str::split_at_checked] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked)
[str::split_at_mut] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut)
[str::split_at_mut_checked] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked)

Cargo

[When merging, replace rather than combine configuration keys that refer to a program path and its arguments.] (rust-lang/cargo#15066)
[Error if both --package and --workspace are passed but the requested package is missing.] (rust-lang/cargo#15071) This was previously silently ignored, which was considered a bug since missing packages should be reported.
[Deprecate the token argument in cargo login to avoid shell history leaks.] (rust-lang/cargo#15057)
[Simplify the implementation of SourceID comparisons.] (rust-lang/cargo#14980) This may potentially change behavior if the canonicalized URL compares differently in alternative registries.

Rustdoc

[Add a sans-serif font setting.] (rust-lang/rust#133636)

Compatibility Notes

[The wasm_c_abi future compatibility warning is now a hard error.] (rust-lang/rust#133951) Users of wasm-bindgen should upgrade to at least version 0.2.89, otherwise compilation will fail.
[Remove long-deprecated no-op attributes #![no_start] and #![crate_id].] (rust-lang/rust#134300)
[The future incompatibility lint cenum_impl_drop_cast has been made into a hard error.] (rust-lang/rust#135964) This means it is now an error to cast a field-less enum to an integer if the enum implements Drop.
[SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.] (rust-lang/rust#137037) To compile for pre-SSE2 32-bit x86, use a "i586" target instead.

Internal Changes

These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools.

[Build the rustc on AArch64 Linux with ThinLTO + PGO.] (rust-lang/rust#133807) The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.

Labels

O-apple

Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)

relnotes

Marks issues that should be documented in the release notes of the next release.

S-waiting-on-bors

Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-compiler

Relevant to the compiler team, which will review and decide on the PR/issue.