Add support for link-flavor rust-lld for iOS, tvOS and watchOS by marysaka · Pull Request #98771 · rust-lang/rust (original) (raw)

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This adds support for rust-lld for Apple *OS targets.

This was tested against targets aarch64-apple-ios and aarch64-apple-ios-sim with a simple test program.

It currently doesn't work with targets armv7-apple-ios and armv7s-apple-ios because of symbols.o not being generated with the correct CPU subtype. This will require changes in the object crate to expose an API.

As ld64.lld requires -platform_version with the minimal version supported and an sdk version, I made rustc_target::apple_base public to get access to *os_deployment_target helper functions and also added tvos_deployment_target as it was missing.

rustbot added the T-compiler

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

label

Jul 1, 2022

Sorry for the delay, I should be able to review this some time this week.

@Thog
Any logic that cannot fail is supposed to go to target definitions in rustc_target.
That's why the *_deployment_target are currently private - they are used from rustc_target and that's enough.

Only get_apple_sdk_root really needs to be delayed until link time.
(Even the pre-existing cmd.args(&["-target", llvm_target]) and cmd.args(&["-arch", arch_name]) are misplaced and can be moved to rustc_target, I think.)

@rustbot author

rustbot 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

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labels

Aug 1, 2022

@Thog Any logic that cannot fail is supposed to go to target definitions in rustc_target. That's why the *_deployment_target are currently private - they are used from rustc_target and that's enough.

Only get_apple_sdk_root really needs to be delayed until link time. (Even the pre-existing cmd.args(&["-target", llvm_target]) and cmd.args(&["-arch", arch_name]) are misplaced and can be moved to rustc_target, I think.)

@rustbot author

I was not sure where to put that part initially, I will address this hopefully this week 👍

@petrochenkov

After a quick look it seems that ios_llvm_target, ios_sim_llvm_target and watchos_sim_llvm_target are used for iOS and watchOS simulator target definitions.

However, at the time of writing arm64_32-apple-watchos and arm64-apple-tvos doesn't select the llvm target with the deployment target.

Should I change those definitions in this PR to make them conform to watchos_deployment_target and tvos_deployment_target respectively?

@Thog
I'm not sure, I'm more familiar with the compiler infrastructure around rustc_target than with details of Apple targets specifically.
You can ping people who added those targets, or maybe PRs adding those targets have some answers.

@petrochenkov I did a refactoring of the linker arguments as suggested and rebased. However, the unit tests that you introduced with #98212 are failing here.

As I understand it, the test checks that the flavor of every LinkArg match the linker_flavor of the target. That's unwanted here as I'm targeting ld.64 specifically and result on a failure.

Shouldn't this actually check that at least one flavor match the linker_flavor?

@Thog I'm not sure, I'm more familiar with the compiler infrastructure around rustc_target than with details of Apple targets specifically. You can ping people who added those targets, or maybe PRs adding those targets have some answers.

I think I will try to handle those changes in a separated PR later

The unit test needs to be updated, to something like

--- a/compiler/rustc_target/src/spec/tests/tests_impl.rs +++ b/compiler/rustc_target/src/spec/tests/tests_impl.rs @@ -46,7 +46,10 @@ fn check_consistency(&self) { ) } (LinkerFlavor::Gcc, LldFlavor::Ld64) => {

•                    assert_matches!(flavor, LinkerFlavor::Gcc)

•                    assert_matches!(

•                        flavor,

•                        LinkerFlavor::Lld(LldFlavor::Ld64) | LinkerFlavor::Gcc

•                    )
                 }
                 (LinkerFlavor::Msvc | LinkerFlavor::Lld(LldFlavor::Link), LldFlavor::Link) => {
                     assert_matches!(

This case just didn't occur previously.

@rustbot label -S-waiting-on-author +S-waiting-on-review

rustbot added S-waiting-on-review

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

and removed S-waiting-on-author

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labels

Aug 3, 2022

Could you also squash commits into one after addressing the comments?
@rustbot author

rustbot added S-waiting-on-author

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Aug 3, 2022

This adds support for rust-lld for Apple *OS targets.

This was tested against targets "aarch64-apple-ios" and "aarch64-apple-ios-sim".

For targets "armv7-apple-ios" and "armv7s-apple-ios", it doesn't link because of "symbols.o" not being generated with the correct CPU subtype (changes in the "object" crate needs to be done to support it).

@rustbot label -S-waiting-on-author +S-waiting-on-review

rustbot added S-waiting-on-review

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

and removed S-waiting-on-author

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

labels

Aug 3, 2022

📌 Commit 78bbe57 has been approved by petrochenkov

It is now in the queue for this repository.

bors added S-waiting-on-bors

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Aug 3, 2022

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

Aug 4, 2022

…iaskrgr

Rollup of 6 pull requests

Successful merges:

• rust-lang#98771 (Add support for link-flavor rust-lld for iOS, tvOS and watchOS)
• rust-lang#98835 (relate closure_substs.parent_substs() to parent fn in NLL)
• rust-lang#99746 (Use TraitEngine in more places that don't specifically need FulfillmentContext::new_in_snapshot)
• rust-lang#99786 (Recover from C++ style enum struct)
• rust-lang#99795 (Delay a bug when failed to normalize trait ref during specialization)
• rust-lang#100029 (Prevent ICE for doc_alias on match arm, statement, expression)

Failed merges:

r? @ghost @rustbot modify labels: rollup

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

Oct 11, 2022

Pkgsrc changes:

• Add patch to fix vendor/kqueue issue (on 32-bit hosts)
• Adjust other patches & line numbers
• Version bumps & checksum changes.

Upstream changes:

Version 1.64.0 (2022-09-22)

Language

• Unions with mutable references or tuples of allowed types are now allowed

• It is now considered valid to deallocate memory pointed to by a shared reference &T if every byte in T is inside an UnsafeCell

• Unused tuple struct fields are now warned against in an allow-by-default lint, [unused_tuple_struct_fields] (rust-lang/rust#95977), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future.

Compiler

• [Add Nintendo Switch as tier 3 target] (rust-lang/rust#88991)
  • Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.
• [Only compile #[used] as llvm.compiler.used for ELF targets] (rust-lang/rust#93718)
• [Add the --diagnostic-width compiler flag to define the terminal width.] (rust-lang/rust#95635)
• [Add support for link-flavor rust-lld for iOS, tvOS and watchOS] (rust-lang/rust#98771)

Libraries

• [Remove restrictions on compare-exchange memory ordering.] (rust-lang/rust#98383)
• You can now write! or writeln! into an OsString: Implement fmt::Write for OsString
• [Make RwLockReadGuard covariant] (rust-lang/rust#96820)
• [Implement FusedIterator for std:🥅:[Into]Incoming] (rust-lang/rust#97300)
• [impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>] (rust-lang/rust#97437)
• [ptr::copy and ptr::swap are doing untyped copies] (rust-lang/rust#97712)
• [Add cgroupv1 support to available_parallelism] (rust-lang/rust#97925)
• [Mitigate many incorrect uses of mem::uninitialized] (rust-lang/rust#99182)

Stabilized APIs

• [future::IntoFuture] (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
• [future::poll_fn] (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
• [task::ready!] (https://doc.rust-lang.org/stable/std/task/macro.ready.html)
• [num::NonZero*::checked_mul] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
• [num::NonZero*::checked_pow] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
• [num::NonZero*::saturating_mul] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
• [num::NonZero*::saturating_pow] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
• [num::NonZeroI*::abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
• [num::NonZeroI*::checked_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
• [num::NonZeroI*::overflowing_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
• [num::NonZeroI*::saturating_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
• [num::NonZeroI*::unsigned_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
• [num::NonZeroI*::wrapping_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
• [num::NonZeroU*::checked_add] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
• [num::NonZeroU*::checked_next_power_of_two] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
• [num::NonZeroU*::saturating_add] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
• [os::unix::process::CommandExt::process_group] (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
• [os::windows::fs::FileTypeExt::is_symlink_dir] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
• [os::windows::fs::FileTypeExt::is_symlink_file] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)

These types were previously stable in std::ffi, but are now also available in core and alloc:

• [core::ffi::CStr] (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
• [core::ffi::FromBytesWithNulError] (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
• [alloc::ffi::CString] (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
• [alloc::ffi::FromVecWithNulError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
• [alloc::ffi::IntoStringError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
• [alloc::ffi::NulError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)

These types were previously stable in std::os::raw, but are now also available in core::ffi and std::ffi:

• [ffi::c_char] (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
• [ffi::c_double] (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
• [ffi::c_float] (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
• [ffi::c_int] (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
• [ffi::c_long] (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
• [ffi::c_longlong] (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
• [ffi::c_schar] (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
• [ffi::c_short] (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
• [ffi::c_uchar] (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
• [ffi::c_uint] (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
• [ffi::c_ulong] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
• [ffi::c_ulonglong] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
• [ffi::c_ushort] (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)

These APIs are now usable in const contexts:

• [slice::from_raw_parts] (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)

Cargo

• [Packages can now inherit settings from the workspace so that the settings can be centralized in one place.] (rust-lang/cargo#10859) See workspace.package and workspace.dependencies for more details on how to define these common settings.
• [Cargo commands can now accept multiple --target flags to build for multiple targets at once] (rust-lang/cargo#10766), and the build.target config option may now take an array of multiple targets.
• [The --jobs argument can now take a negative number to count backwards from the max CPUs.] (rust-lang/cargo#10844)
• [cargo add will now update Cargo.lock.] (rust-lang/cargo#10902)
• Added the --crate-type flag to cargo rustc to override the crate type.
• [Significantly improved the performance fetching git dependencies from GitHub when using a hash in the rev field.] (rust-lang/cargo#10079)

Misc

• [The rust-analyzer rustup component is now available on the stable channel.] (rust-lang/rust#98640)

Compatibility Notes

• The minimum required versions for all -linux-gnu targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: Increase the minimum linux-gnu versions
• [Network primitives are now implemented with the ideal Rust layout, not the C system layout] (rust-lang/rust#78802). This can cause problems when transmuting the types.
• [Add assertion that transmute_copy's U is not larger than T] (rust-lang/rust#98839)
• [A soundness bug in BTreeMap was fixed] (rust-lang/rust#99413) that allowed data it was borrowing to be dropped before the container.
• [The Drop behavior of C-like enums cast to ints has changed] (rust-lang/rust#96862). These are already discouraged by a compiler warning.
• [Relate late-bound closure lifetimes to parent fn in NLL] (rust-lang/rust#98835)
• [Errors at const-eval time are now in future incompatibility reports] (rust-lang/rust#97743)
• On the thumbv6m-none-eabi target, some incorrect asm! statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted] (rust-lang/rust#99155).
• [impl Trait was accidentally accepted as the associated type value of return-position impl Trait] (rust-lang/rust#97346), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed.

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.

• Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds] (rust-lang/rust#96978)
• [Stop keeping metadata in memory before writing it to disk] (rust-lang/rust#96544)
• [compiletest: strip debuginfo by default for mode=ui] (rust-lang/rust#98140)
• Many improvements to generated code for derives, including performance improvements:
  • [Don't use match-destructuring for derived ops on structs.] (rust-lang/rust#98446)
  • [Many small deriving cleanups] (rust-lang/rust#98741)
  • [More derive output improvements] (rust-lang/rust#98758)
  • Clarify deriving code
  • [Final derive output improvements] (rust-lang/rust#99046)
  • Stop injecting #[allow(unused_qualifications)] in generated derive implementations
  • Improve derive(Debug)
• Bump to clap 3
• fully move dropck to mir
• [Optimize Vec::insert for the case where index == len.] (rust-lang/rust#98755)
• [Convert rust-analyzer to an in-tree tool] (rust-lang/rust#99603)

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

Nov 16, 2022

Pkgsrc changes:

• This package now contains rust-analyzer, so implicitly conflicts with that pkgsrc package. The same goes for the rust-src package.
• Add NetBSD/arm6 port
• Add unfinished NetBSD/mipsel port
• Revert the use of the internal LLVM, should now build with the new pkgsrc LLVM (15).
• Add depndence on compat80 for sparc64 to fix the build
• Adapt patches
• Add CHECK_INTERPRETER_SKIP for a few (mostly unused) files. (A proper fix may come later.)

Upstream changes:

Version 1.64.0 (2022-09-22)

Language

• Unions with mutable references or tuples of allowed types are now allowed

• It is now considered valid to deallocate memory pointed to by a shared reference &T if every byte in T is inside an UnsafeCell

• Unused tuple struct fields are now warned against in an allow-by-default lint, [unused_tuple_struct_fields] (rust-lang/rust#95977), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future.

Compiler

• [Add Nintendo Switch as tier 3 target] (rust-lang/rust#88991)
  • Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.
• [Only compile #[used] as llvm.compiler.used for ELF targets] (rust-lang/rust#93718)
• [Add the --diagnostic-width compiler flag to define the terminal width.] (rust-lang/rust#95635)
• [Add support for link-flavor rust-lld for iOS, tvOS and watchOS] (rust-lang/rust#98771)

Libraries

• [Remove restrictions on compare-exchange memory ordering.] (rust-lang/rust#98383)
• You can now write! or writeln! into an OsString: Implement fmt::Write for OsString
• [Make RwLockReadGuard covariant] (rust-lang/rust#96820)
• [Implement FusedIterator for std:🥅:[Into]Incoming] (rust-lang/rust#97300)
• [impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>] (rust-lang/rust#97437)
• [ptr::copy and ptr::swap are doing untyped copies] (rust-lang/rust#97712)
• [Add cgroupv1 support to available_parallelism] (rust-lang/rust#97925)
• [Mitigate many incorrect uses of mem::uninitialized] (rust-lang/rust#99182)

Stabilized APIs

• [future::IntoFuture] (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
• [future::poll_fn] (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
• [task::ready!] (https://doc.rust-lang.org/stable/std/task/macro.ready.html)
• [num::NonZero*::checked_mul] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
• [num::NonZero*::checked_pow] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
• [num::NonZero*::saturating_mul] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
• [num::NonZero*::saturating_pow] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
• [num::NonZeroI*::abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
• [num::NonZeroI*::checked_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
• [num::NonZeroI*::overflowing_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
• [num::NonZeroI*::saturating_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
• [num::NonZeroI*::unsigned_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
• [num::NonZeroI*::wrapping_abs] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
• [num::NonZeroU*::checked_add] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
• [num::NonZeroU*::checked_next_power_of_two] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
• [num::NonZeroU*::saturating_add] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
• [os::unix::process::CommandExt::process_group] (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
• [os::windows::fs::FileTypeExt::is_symlink_dir] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
• [os::windows::fs::FileTypeExt::is_symlink_file] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)

These types were previously stable in std::ffi, but are now also available in core and alloc:

• [core::ffi::CStr] (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
• [core::ffi::FromBytesWithNulError] (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
• [alloc::ffi::CString] (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
• [alloc::ffi::FromVecWithNulError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
• [alloc::ffi::IntoStringError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
• [alloc::ffi::NulError] (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)

These types were previously stable in std::os::raw, but are now also available in core::ffi and std::ffi:

• [ffi::c_char] (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
• [ffi::c_double] (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
• [ffi::c_float] (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
• [ffi::c_int] (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
• [ffi::c_long] (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
• [ffi::c_longlong] (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
• [ffi::c_schar] (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
• [ffi::c_short] (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
• [ffi::c_uchar] (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
• [ffi::c_uint] (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
• [ffi::c_ulong] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
• [ffi::c_ulonglong] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
• [ffi::c_ushort] (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)

These APIs are now usable in const contexts:

• [slice::from_raw_parts] (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)

Cargo

• [Packages can now inherit settings from the workspace so that the settings can be centralized in one place.] (rust-lang/cargo#10859) See workspace.package and workspace.dependencies for more details on how to define these common settings.
• [Cargo commands can now accept multiple --target flags to build for multiple targets at once] (rust-lang/cargo#10766), and the build.target config option may now take an array of multiple targets.
• [The --jobs argument can now take a negative number to count backwards from the max CPUs.] (rust-lang/cargo#10844)
• [cargo add will now update Cargo.lock.] (rust-lang/cargo#10902)
• Added the --crate-type flag to cargo rustc to override the crate type.
• [Significantly improved the performance fetching git dependencies from GitHub when using a hash in the rev field.] (rust-lang/cargo#10079)

Misc

• [The rust-analyzer rustup component is now available on the stable channel.] (rust-lang/rust#98640)

Compatibility Notes

• The minimum required versions for all -linux-gnu targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: Increase the minimum linux-gnu versions
• [Network primitives are now implemented with the ideal Rust layout, not the C system layout] (rust-lang/rust#78802). This can cause problems when transmuting the types.
• [Add assertion that transmute_copy's U is not larger than T] (rust-lang/rust#98839)
• [A soundness bug in BTreeMap was fixed] (rust-lang/rust#99413) that allowed data it was borrowing to be dropped before the container.
• [The Drop behavior of C-like enums cast to ints has changed] (rust-lang/rust#96862). These are already discouraged by a compiler warning.
• [Relate late-bound closure lifetimes to parent fn in NLL] (rust-lang/rust#98835)
• [Errors at const-eval time are now in future incompatibility reports] (rust-lang/rust#97743)
• On the thumbv6m-none-eabi target, some incorrect asm! statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted] (rust-lang/rust#99155).
• [impl Trait was accidentally accepted as the associated type value of return-position impl Trait] (rust-lang/rust#97346), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed.

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.

• Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds] (rust-lang/rust#96978)
• [Stop keeping metadata in memory before writing it to disk] (rust-lang/rust#96544)
• [compiletest: strip debuginfo by default for mode=ui] (rust-lang/rust#98140)
• Many improvements to generated code for derives, including performance improvements:
  • [Don't use match-destructuring for derived ops on structs.] (rust-lang/rust#98446)
  • [Many small deriving cleanups] (rust-lang/rust#98741)
  • [More derive output improvements] (rust-lang/rust#98758)
  • Clarify deriving code
  • [Final derive output improvements] (rust-lang/rust#99046)
  • Stop injecting #[allow(unused_qualifications)] in generated derive implementations
  • Improve derive(Debug)
• Bump to clap 3
• fully move dropck to mir
• [Optimize Vec::insert for the case where index == len.] (rust-lang/rust#98755)
• [Convert rust-analyzer to an in-tree tool] (rust-lang/rust#99603)

Labels

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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.