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rust183: add a package for rust version 1.83.0.
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Pkgsrc changes compared to rust182:
 * Remove patches related to rust-lang/rust#130110,
   which is now integrated upstream.
 * Remove patch to vendor/cc-1.0.79, now integrated in the current
   vendored cc crate.
 * Checksum updates.

TODO:
 * Cross-compilation fails ref.
   rust-lang/rust#133629

Upstream changes:

Version 1.83.0 (2024-11-28)
==========================

Language
--------
- [Stabilize `&mut`, `*mut`, `&Cell`, and `*const Cell` in const.]
  (rust-lang/rust#129195)
- [Allow creating references to statics in `const` initializers.]
  (rust-lang/rust#129759)
- [Implement raw lifetimes and labels (`'r#ident`).]
  (rust-lang/rust#126452)
- [Define behavior when atomic and non-atomic reads race.]
  (rust-lang/rust#128778)
- [Non-exhaustive structs may now be empty.]
  (rust-lang/rust#128934)
- [Disallow implicit coercions from places of type `!`]
  (rust-lang/rust#129392)
- [`const extern` functions can now be defined for other calling conventions.]
  (rust-lang/rust#129753)
- [Stabilize `expr_2021` macro fragment specifier in all editions.]
  (rust-lang/rust#129972)
- [The `non_local_definitions` lint now fires on less code and
  warns by default.]
  (rust-lang/rust#127117)

Compiler
--------
- [Deprecate unsound `-Csoft-float` flag.]
  (rust-lang/rust#129897)
- Add many new tier 3 targets:
    - [`aarch64_unknown_nto_qnx700`]
      (rust-lang/rust#127897)
    - [`arm64e-apple-tvos`]
      (rust-lang/rust#130614)
    - [`armv7-rtems-eabihf`]
      (rust-lang/rust#127021)
    - [`loongarch64-unknown-linux-ohos`]
      (rust-lang/rust#130750)
    - [`riscv32-wrs-vxworks` and `riscv64-wrs-vxworks`]
      (rust-lang/rust#130549)
    - [`riscv32{e|em|emc}-unknown-none-elf`]
      (rust-lang/rust#130555)
    - [`x86_64-unknown-hurd-gnu`]
      (rust-lang/rust#128345)
    - [`x86_64-unknown-trusty`]
      (rust-lang/rust#130453)

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

Libraries
---------
- [Implement `PartialEq` for `ExitCode`.]
  (rust-lang/rust#127633)
- [Document that `catch_unwind` can deal with foreign exceptions
  without UB, although the exact behavior is unspecified.]
  (rust-lang/rust#128321)
- [Implement `Default` for `HashMap`/`HashSet` iterators that don't
  already have it.]
  (rust-lang/rust#128711)
- [Bump Unicode to version 16.0.0.]
  (rust-lang/rust#130183)
- [Change documentation of `ptr::add`/`sub` to not claim equivalence
  with `offset`.]
  (rust-lang/rust#130229).

Stabilized APIs
---------------

- [`BufRead::skip_until`]
  (https://doc.rust-lang.org/stable/std/io/trait.BufRead.html#method.skip_until)
- [`ControlFlow::break_value`]
  (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.break_value)
- [`ControlFlow::continue_value`]
  (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.continue_value)
- [`ControlFlow::map_break`]
  (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.map_break)
- [`ControlFlow::map_continue`]
  (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.map_continue)
- [`DebugList::finish_non_exhaustive`]
  (https://doc.rust-lang.org/stable/core/fmt/struct.DebugList.html#method.finish_non_exhaustive)
- [`DebugMap::finish_non_exhaustive`]
  (https://doc.rust-lang.org/stable/core/fmt/struct.DebugMap.html#method.finish_non_exhaustive)
- [`DebugSet::finish_non_exhaustive`]
  (https://doc.rust-lang.org/stable/core/fmt/struct.DebugSet.html#method.finish_non_exhaustive)
- [`DebugTuple::finish_non_exhaustive`]
  (https://doc.rust-lang.org/stable/core/fmt/struct.DebugTuple.html#method.finish_non_exhaustive)
- [`ErrorKind::ArgumentListTooLong`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ArgumentListTooLong)
- [`ErrorKind::Deadlock`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.Deadlock)
- [`ErrorKind::DirectoryNotEmpty`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.DirectoryNotEmpty)
- [`ErrorKind::ExecutableFileBusy`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ExecutableFileBusy)
- [`ErrorKind::FileTooLarge`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.FileTooLarge)
- [`ErrorKind::HostUnreachable`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.HostUnreachable)
- [`ErrorKind::IsADirectory`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.IsADirectory)
- [`ErrorKind::NetworkDown`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NetworkDown)
- [`ErrorKind::NetworkUnreachable`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NetworkUnreachable)
- [`ErrorKind::NotADirectory`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NotADirectory)
- [`ErrorKind::NotSeekable`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.NotSeekable)
- [`ErrorKind::ReadOnlyFilesystem`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ReadOnlyFilesystem)
- [`ErrorKind::ResourceBusy`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.ResourceBusy)
- [`ErrorKind::StaleNetworkFileHandle`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.StaleNetworkFileHandle)
- [`ErrorKind::StorageFull`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.StorageFull)
- [`ErrorKind::TooManyLinks`]
  (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.TooManyLinks)
- [`Option::get_or_insert_default`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.get_or_insert_default)
- [`Waker::data`]
  (https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.data)
- [`Waker::new`]
  (https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.new)
- [`Waker::vtable`]
  (https://doc.rust-lang.org/stable/core/task/struct.Waker.html#method.vtable)
- [`char::MIN`]
  (https://doc.rust-lang.org/stable/core/primitive.char.html#associatedconstant.MIN)
- [`hash_map::Entry::insert_entry`]
  (https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.insert_entry)
- [`hash_map::VacantEntry::insert_entry`]
  (https://doc.rust-lang.org/stable/std/collections/hash_map/struct.VacantEntry.html#method.insert_entry)

These APIs are now stable in const contexts:

- [`Cell::into_inner`]
  (https://doc.rust-lang.org/stable/core/cell/struct.Cell.html#method.into_inner)
- [`Duration::as_secs_f32`]
  (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.as_secs_f32)
- [`Duration::as_secs_f64`]
  (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.as_secs_f64)
- [`Duration::div_duration_f32`]
  (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.div_duration_f32)
- [`Duration::div_duration_f64`]
  (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.div_duration_f64)
- [`MaybeUninit::as_mut_ptr`]
  (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.as_mut_ptr)
- [`NonNull::as_mut`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_mut)
- [`NonNull::copy_from`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_from)
- [`NonNull::copy_from_nonoverlapping`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_from_nonoverlapping)
- [`NonNull::copy_to`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_to)
- [`NonNull::copy_to_nonoverlapping`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.copy_to_nonoverlapping)
- [`NonNull::slice_from_raw_parts`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.slice_from_raw_parts)
- [`NonNull::write`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write)
- [`NonNull::write_bytes`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write_bytes)
- [`NonNull::write_unaligned`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.write_unaligned)
- [`OnceCell::into_inner`]
  (https://doc.rust-lang.org/stable/core/cell/struct.OnceCell.html#method.into_inner)
- [`Option::as_mut`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_mut)
- [`Option::expect`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.expect)
- [`Option::replace`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.replace)
- [`Option::take`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.take)
- [`Option::unwrap`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.unwrap)
- [`Option::unwrap_unchecked`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.unwrap_unchecked)
- [`Option::<&_>::copied`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.copied)
- [`Option::<&mut _>::copied`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.copied-1)
- [`Option::<Option<_>>::flatten`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.flatten)
- [`Option::<Result<_, _>>::transpose`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.transpose)
- [`RefCell::into_inner`]
  (https://doc.rust-lang.org/stable/core/cell/struct.RefCell.html#method.into_inner)
- [`Result::as_mut`]
  (https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.as_mut)
- [`Result::<&_, _>::copied`]
  (https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.copied)
- [`Result::<&mut _, _>::copied`]
  (https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.copied-1)
- [`Result::<Option<_>, _>::transpose`]
  (https://doc.rust-lang.org/stable/core/result/enum.Result.html#method.transpose)
- [`UnsafeCell::get_mut`]
  (https://doc.rust-lang.org/stable/core/cell/struct.UnsafeCell.html#method.get_mut)
- [`UnsafeCell::into_inner`]
  (https://doc.rust-lang.org/stable/core/cell/struct.UnsafeCell.html#method.into_inner)
- [`array::from_mut`]
  (https://doc.rust-lang.org/stable/core/array/fn.from_mut.html)
- [`char::encode_utf8`]
  (https://doc.rust-lang.org/stable/core/primitive.char.html#method.encode_utf8)
- [`{float}::classify`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.classify)
- [`{float}::is_finite`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_finite)
- [`{float}::is_infinite`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_infinite)
- [`{float}::is_nan`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_nan)
- [`{float}::is_normal`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_normal)
- [`{float}::is_sign_negative`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_sign_negative)
- [`{float}::is_sign_positive`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_sign_positive)
- [`{float}::is_subnormal`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.is_subnormal)
- [`{float}::from_bits`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_bits)
- [`{float}::from_be_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_be_bytes)
- [`{float}::from_le_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_le_bytes)
- [`{float}::from_ne_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.from_ne_bytes)
- [`{float}::to_bits`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_bits)
- [`{float}::to_be_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_be_bytes)
- [`{float}::to_le_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_le_bytes)
- [`{float}::to_ne_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.f64.html#method.to_ne_bytes)
- [`mem::replace`]
  (https://doc.rust-lang.org/stable/core/mem/fn.replace.html)
- [`ptr::replace`]
  (https://doc.rust-lang.org/stable/core/ptr/fn.replace.html)
- [`ptr::slice_from_raw_parts_mut`]
  (https://doc.rust-lang.org/stable/core/ptr/fn.slice_from_raw_parts_mut.html)
- [`ptr::write`]
  (https://doc.rust-lang.org/stable/core/ptr/fn.write.html)
- [`ptr::write_unaligned`]
  (https://doc.rust-lang.org/stable/core/ptr/fn.write_unaligned.html)
- [`<*const _>::copy_to`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to)
- [`<*const _>::copy_to_nonoverlapping`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to_nonoverlapping)
- [`<*mut _>::copy_from`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_from)
- [`<*mut _>::copy_from_nonoverlapping`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_from_nonoverlapping)
- [`<*mut _>::copy_to`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to-1)
- [`<*mut _>::copy_to_nonoverlapping`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.copy_to_nonoverlapping-1)
- [`<*mut _>::write`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write)
- [`<*mut _>::write_bytes`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write_bytes)
- [`<*mut _>::write_unaligned`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.write_unaligned)
- [`slice::from_mut`]
  (https://doc.rust-lang.org/stable/core/slice/fn.from_mut.html)
- [`slice::from_raw_parts_mut`]
  (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts_mut.html)
- [`<[_]>::first_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.first_mut)
- [`<[_]>::last_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.last_mut)
- [`<[_]>::first_chunk_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.first_chunk_mut)
- [`<[_]>::last_chunk_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.last_chunk_mut)
- [`<[_]>::split_at_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut)
- [`<[_]>::split_at_mut_checked`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut_checked)
- [`<[_]>::split_at_mut_unchecked`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_at_mut_unchecked)
- [`<[_]>::split_first_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_first_mut)
- [`<[_]>::split_last_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_last_mut)
- [`<[_]>::split_first_chunk_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_first_chunk_mut)
- [`<[_]>::split_last_chunk_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.split_last_chunk_mut)
- [`str::as_bytes_mut`]
  (https://doc.rust-lang.org/stable/core/primitive.str.html#method.as_bytes_mut)
- [`str::as_mut_ptr`]
  (https://doc.rust-lang.org/stable/core/primitive.str.html#method.as_mut_ptr)
- [`str::from_utf8_unchecked_mut`]
  (https://doc.rust-lang.org/stable/core/str/fn.from_utf8_unchecked_mut.html)

Cargo
-----
- [Introduced a new `CARGO_MANIFEST_PATH` environment variable,
  similar to `CARGO_MANIFEST_DIR` but pointing directly to the manifest
  file.]
  (rust-lang/cargo#14404)
- [Added `package.autolib` to the manifest, allowing `[lib]`
  auto-discovery to be disabled.]
  (rust-lang/cargo#14591)
- [Declare support level for each crate in Cargo's Charter / crate docs.]
  (rust-lang/cargo#14600)
- [Declare new Intentional Artifacts as 'small' changes.]
  (rust-lang/cargo#14599)

Rustdoc
-------

- [The sidebar / hamburger menu table of contents now includes the
  `# headers` from the main item's doc comment]
  (rust-lang/rust#120736). This is similar
  to a third-party feature provided by the rustdoc-search-enhancements
  browser extension.

Compatibility Notes
-------------------
- [Warn against function pointers using unsupported ABI strings.]
  (rust-lang/rust#128784)
- [Check well-formedness of the source type's signature in fn
  pointer casts.]
  (rust-lang/rust#129021) This partly closes
  a soundness hole that comes when casting a function item to
  function pointer
- [Use equality instead of subtyping when resolving type dependent paths.]
  (rust-lang/rust#129073)
- Linking on macOS now correctly includes Rust's default deployment
  target. Due to a linker bug, you might have to pass
  `MACOSX_DEPLOYMENT_TARGET` or fix your `#[link]` attributes to
  point to the correct frameworks. See
  <rust-lang/rust#129369>.
- [Rust will now correctly raise an error for `repr(Rust)` written
  on non-`struct`/`enum`/`union` items, since it previous did not
  have any effect.]
  (rust-lang/rust#129422)
- The future incompatibility lint `deprecated_cfg_attr_crate_type_name`
  [has been made into a hard error]
  (rust-lang/rust#129670). It was used to
  deny usage of `#![crate_type]` and `#![crate_name]` attributes in
  `#![cfg_attr]`, which required a hack in the compiler to be able
  to change the used crate type and crate name after cfg expansion.
  Users can use `--crate-type` instead of `#![cfg_attr(..., crate_type
  = "...")]` and `--crate-name` instead of `#![cfg_attr(...,
  crate_name = "...")]` when running `rustc`/`cargo rustc` on the
  command line.  Use of those two attributes outside of `#![cfg_attr]`
  continue to be fully supported.

- Until now, paths into the sysroot were always prefixed with
  `/rustc/$hash` in diagnostics, codegen, backtrace, e.g.
    ```
    thread 'main' panicked at 'hello world', map-panic.rs:2:50
    stack backtrace:
       0: std::panicking::begin_panic
                 at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/std/src/panicking.rs:616:12
       1: map_panic::main::{{closure}}
                 at ./map-panic.rs:2:50
       2: core::option::Option<T>::map
                 at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/option.rs:929:29
       3: map_panic::main
                 at ./map-panic.rs:2:30
       4: core::ops::function::FnOnce::call_once
                 at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5
    note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
    ```
  [RFC 3127 said]
  (https://rust-lang.github.io/rfcs/3127-trim-paths.html#changing-handling-of-sysroot-path-in-rustc)
  > We want to change this behaviour such that, when `rust-src`
    source files can be discovered, the virtual path is discarded
    and therefore the local path will be embedded, unless there is
    a `--remap-path-prefix` that causes this local path to be remapped
    in the usual way.

    [#129687](rust-lang/rust#129687)
    implements this behaviour, when `rust-src` is present at compile
    time, `rustc` replaces `/rustc/$hash` with a real path into
    the local `rust-src` component with best effort.  To sanitize
    this, users must explicitly supply `--remap-path-prefix=<path
    to rust-src>=foo` or not have the `rust-src` component installed.
- The allow-by-default `missing_docs` lint used to disable itself
  when invoked through `rustc --test`/`cargo test`, resulting in
  `#[expect(missing_docs)]` emitting false positives due to the
  expectation being wrongly unfulfilled. This behavior [has now been
  removed]
  (rust-lang/rust#130025), which allows
  `#[expect(missing_docs)]` to be fulfilled in all scenarios, but
  will also report new `missing_docs` diagnostics for publicly
  reachable `#[cfg(test)]` items, [integration test]
  (https://doc.rust-lang.org/cargo/reference/cargo-targets.html#integration-tests)
  crate-level documentation, and publicly reachable items in
  integration tests.
- [The `armv8r-none-eabihf` target now uses the Armv8-R required
  set of floating-point features.]
  (rust-lang/rust#130295)
- [Fix a soundness bug where rustc wouldn't detect unconstrained
  higher-ranked lifetimes in a `dyn Trait`'s associated types that
  occur due to supertraits.]
  (rust-lang/rust#130367)
- [Update the minimum external LLVM version to 18.]
  (rust-lang/rust#130487)
- [Remove `aarch64-fuchsia` and `x86_64-fuchsia` target aliases in
  favor of `aarch64-unknown-fuchsia` and `x86_64-unknown-fuchsia`
  respectively.]
  (rust-lang/rust#130657)
- [The ABI-level exception class of a Rust panic is now encoded
  with native-endian bytes, so it is legible in hex dumps.]
  (rust-lang/rust#130897)
- [Visual Studio 2013 is no longer supported for MSVC targets.]
  (rust-lang/rust#131070)
- [The sysroot no longer contains the `std` dynamic library in its
  top-level `lib/` dir.]
  (rust-lang/rust#131188)
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13 changes: 13 additions & 0 deletions rust183/DESCR
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Rust is a systems programming language focused on three goals: safety,
speed, and concurrency. It maintains these goals without having a
garbage collector, making it a useful language for a number of use cases
other languages aren't good at: embedding in other languages, programs
with specific space and time requirements, and writing low-level code,
like device drivers and operating systems.

It improves on current languages targeting this space by having a number
of compile-time safety checks that produce no runtime overhead, while
eliminating all data races. Rust also aims to achieve "zero-cost
abstractions" even though some of these abstractions feel like those of
a high-level language. Even then, Rust still allows precise control
like a low-level language would.
85 changes: 85 additions & 0 deletions rust183/HOWTO-BOOTSTRAP
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How to build a rust bootstrap kit using pkgsrc
----------------------------------------------

A rust bootstrap kit is simply a pre-compiled binary of rust and
the rust standard library, and contains the "rust" and "rust-std"
build results, found in

work/rustc-<version>/build/dist/
as
rust-<version>-<target>.tar.xz
and
rust-std-<version>-<target>.tar.xz

These result files are produced when the "dist" build target is
used, ref. BUILD_TARGET. For a normal native build of the rust
pkgsrc package, the default BUILD_TARGET is "build", not "dist".

There are two possible ways to produce a bootstrap kit:

1) a native build. This requires minimum preparation, except
possibly for setting rust.BUILD_TARGET to "dist" via e.g.
/etc/mk.conf. Note that on NetBSD, using the "BUILD_TARGET" ==
"dist" results in the "rust-cargo-static" option being set, ref.
options.mk. This is so that the resulting bootstrap kits are
built with mostly-static linking, reducing the run-time dependencies
of the bootstrap kits.

2) a cross-build. This requires a bit of preparation:

For each target you want to cross-build rust for, you need
- the cross toolchain resulting from "build.sh tools" for
the intended target
- an OS distribution extracted, including the comp.tgz
set so that the target's include files can be used
- for 32-bit ports, the "libatomic" package needs to be
available. I'm sure there's a clever and long-winded
use of pkg_install which can be used to effect this;
I on my hand have always just extracted the tgz file
and done the minimal cleanup of the "cruft" files
which are part of the package meta-data.
- Pick a root directory for the target, e.g. /u/i386.
Below this directory place the "tools" containing
the cross-compiler in a "tools" sub-directory.
Similarly, the extracted OS distribution in the "dest"
sub-directory.

There are two methods available for doing the cross-compile:

a) Using the "cross.mk" file. For an i386 build against i586, the
following settings should be active:

CROSS_ROOT= /u/i386
MAKE_ENV+= CROSS_ROOT=${CROSS_ROOT}
GNU_CROSS_TARGET= i486--netbsdelf
MAKE_ENV+= GNU_CROSS_TARGET=${GNU_CROSS_TARGET}
TARGET= i586-unknown-netbsd
SCRIPTS= ${WRKDIR}/scripts
CONFIGURE_ARGS+= --host=${TARGET}
CONFIGURE_ARGS+= --target=${TARGET}
CONFIGURE_ARGS+= --set=target.${TARGET}.cc=${SCRIPTS}/gcc-wrap
CONFIGURE_ARGS+= --set=target.${TARGET}.cxx=${SCRIPTS}/c++-wrap
CONFIGURE_ARGS+= --set=target.${TARGET}.linker=${SCRIPTS}/gcc-wrap
CONFIGURE_ARGS+= --set=target.${TARGET}.ar=${CROSS_ROOT}/tools/bin/${GNU_CROSS_TARGET}-ar

Then doing a "make" will cross-build rust, including the LLVM
embedded in the rust distribution, ref. the defaulting of that
option when TARGET is defined ref. options.mk.

Note that when TARGET is set, the default build target for
the rust makefile becomes "dist", so there's no need to set
rust.BUILD_TARGET for cross-builds.

b) Using the "do-cross.mk" Makefile. This will attempt to
cross-build rust for all the targets listed in the SHORT_TARGETS
variable in that file. Overriding the root directories for
the various targets can be done by making your own "local-roots.mk"
file, ref. "do-cross.mk".

This will create a "dist" subdirectory in the rust pkgsrc
directory, and the bootstrap kits for each architecture, plus
the library source kit will be placed in this directory.

The bootstrap kits can then be placed in /usr/pkgsrc/distfiles, and
be used by the "next" rust version, where you can use "make makesum"
to compute the updated checksums for the bootstrap kits.
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