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Release notes for 1.8
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Brian Anderson
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RELEASES.md
208
RELEASES.md
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Version 1.8.0 (2016-04-14)
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==========================
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Language
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--------
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* Rust supports overloading of compound assignment statements like
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`+=` by implementing the [`AddAssign`], [`SubAssign`],
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[`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
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[`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
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traits. [RFC 953].
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* Empty structs can be defined with braces, as in `struct Foo { }`, in
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addition to the non-braced form, `struct Foo;`. [RFC 218].
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Libraries
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---------
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* Stabilized APIs:
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* [`str::encode_utf16`][] (renamed from `utf16_units`)
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* [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
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* [`Ref::map`]
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* [`RefMut::map`]
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* [`ptr::drop_in_place`]
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* [`time::Instant`]
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* [`time::SystemTime`]
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* [`Instant::now`]
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* [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
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* [`Instant::elapsed`]
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* [`SystemTime::now`]
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* [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
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* [`SystemTime::elapsed`]
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* Various `Add`/`Sub` impls for `Time` and `SystemTime`
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* [`SystemTimeError`]
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* [`SystemTimeError::duration`]
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* Various impls for `SystemTimeError`
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* [`UNIX_EPOCH`]
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* [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
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[`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
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[`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
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* [The `write!` and `writeln!` macros correctly emit errors if any of
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their arguments can't be formatted][1.8w].
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* [Various I/O functions support large files on 32-bit Linux][1.8l].
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* [The Unix-specific `raw` modules, which contain a number of
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redefined C types are deprecated][1.8r], including `os::raw::unix`,
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`os::raw::macos`, and `os::raw::linux`. These modules defined types
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such as `ino_t` and `dev_t`. The inconsistency of these definitions
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across platforms was making it difficult to implement `std`
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correctly. Those that need these definitions should use the `libc`
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crate. [RFC 1415].
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* The Unix-specific `MetadataExt` traits, including
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`os::unix::fs::MetadataExt`, which expose values such as inode
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numbers [no longer return platform-specific types][1.8r], but
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instead return widened integers. [RFC 1415].
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* [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
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* [Atomic loads and stores are not volatile][1.8a].
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* [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
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Performance
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-----------
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* [Inlining hash functions lead to a 3% compile-time improvement in
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some workloads][1.8h].
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* When using jemalloc, its symbols are [unprefixed so that it
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overrides the libc malloc implementation][1.8h]. This means that for
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rustc, LLVM is now using jemalloc, which results in a 6%
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compile-time improvement on a specific workload.
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* [Avoid quadratic growth in function size due to cleanups][1.8cu].
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Misc
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----
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* [32-bit MSVC builds finally implement unwinding][1.8ms].
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i686-pc-windows-msvc is now considered a tier-1 platform.
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* [The `--print targets` flag prints a list of supported targets][1.8t].
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* [The `--print cfg` flag prints the `cfg`s defined for the current
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target][1.8cf].
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* [`rustc` can be built with an new Cargo-based build system, written
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in Rust][1.8b]. It will eventually replace Rust's Makefile-based
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build system. To enable it configure with `configure --rustbuild`.
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* [Errors for non-exhaustive `match` patterns now list up to 3 missing
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variants while also indicating the total number of missing variants
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if more than 3][1.8m].
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* [Executable stacks are disabled on Linux and BSD][1.8nx].
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* The Rust Project now publishes binary releases of the standard
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library for a number of tier-2 targets:
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`armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
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`powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
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`x86_64-rumprun-netbsd`. These can be installed with
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tools such as [multirust][1.8mr].
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Cargo
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-----
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* [`cargo init` creates a new Cargo project in the current
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directory][1.8ci]. It is otherwise like `cargo new`.
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* [Cargo has configuration keys for `-v` and
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`--color`][1.8cc]. `verbose` and `color`, respectively, go in the
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`[term]` section of `.cargo/config`.
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* [Configuration keys that evaluate to strings or integers can be set
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via environment variables][1.8ce]. For example the `build.jobs` key
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can be set via `CARGO_BUILD_JOBS`. Environment variables take
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precedence over config files.
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* [Target-specific dependencies support Rust `cfg` syntax for
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describing targets][1.8cfg] so that dependencies for multiple
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targets can be specified together. [RFC 1361].
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* [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
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`RUSTDOC` take precedence over the `build.target-dir`,
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`build.rustc`, and `build.rustdoc` configuration values][1.8cv].
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* [The child process tree is killed on Windows when Cargo is
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killed][1.8ck].
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* [The `build.target` configuration value sets the target platform,
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like `--target`][1.8ct].
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Compatibility Notes
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-------------------
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* [Unstable compiler flags have been further restricted][1.8u]. Since
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1.0 `-Z` flags have been considered unstable, and other flags that
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were considered unstable additionally required passing `-Z
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unstable-options` to access. Unlike unstable language and library
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features though, these options have been accessible on the stable
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release channel. Going forward, *new unstable flags will not be
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available on the stable release channel*, and old unstable flags
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will warn about their usage. In the future, all unstable flags will
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be unavailable on the stable release channel.
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* [It is no longer possible to `match` on empty enum variants using
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the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
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* The Unix-specific `MetadataExt` traits, including
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`os::unix::fs::MetadataExt`, which expose values such as inode
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numbers [no longer return platform-specific types][1.8r], but
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instead return widened integers. [RFC 1415].
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* [Modules sourced from the filesystem cannot appear within arbitrary
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blocks, but only within other modules][1.8m].
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* [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
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* On Unix, [stack overflow triggers a runtime abort instead of a
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SIGSEGV][1.8so].
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* [`Command::spawn` and its equivalents return an error if any of
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its command-line arguments contain interior `NUL`s][1.8n].
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* [Tuple and unit enum variants from other crates are in the type
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namespace][1.8tn].
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* [On Windows `rustc` emits `.lib` files for the `staticlib` library
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type instead of `.a` files][1.8st]. Additionally, for the MSVC
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toolchain, `rustc` emits import libraries named `foo.dll.lib`
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instead of `foo.lib`.
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[1.8a]: https://github.com/rust-lang/rust/pull/30962
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[1.8b]: https://github.com/rust-lang/rust/pull/31123
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[1.8c]: https://github.com/rust-lang/rust/pull/31530
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[1.8cc]: https://github.com/rust-lang/cargo/pull/2397
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[1.8ce]: https://github.com/rust-lang/cargo/pull/2398
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[1.8cf]: https://github.com/rust-lang/rust/pull/31278
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[1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
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[1.8ci]: https://github.com/rust-lang/cargo/pull/2081
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[1.8ck]: https://github.com/rust-lang/cargo/pull/2370
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[1.8ct]: https://github.com/rust-lang/cargo/pull/2335
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[1.8cu]: https://github.com/rust-lang/rust/pull/31390
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[1.8cv]: https://github.com/rust-lang/cargo/issues/2365
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[1.8cv]: https://github.com/rust-lang/rust/pull/30998
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[1.8h]: https://github.com/rust-lang/rust/pull/31460
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[1.8l]: https://github.com/rust-lang/rust/pull/31668
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[1.8m]: https://github.com/rust-lang/rust/pull/31020
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[1.8m]: https://github.com/rust-lang/rust/pull/31534
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[1.8mp]: https://github.com/rust-lang/rust/pull/30894
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[1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
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[1.8ms]: https://github.com/rust-lang/rust/pull/30448
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[1.8n]: https://github.com/rust-lang/rust/pull/31056
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[1.8nx]: https://github.com/rust-lang/rust/pull/30859
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[1.8r]: https://github.com/rust-lang/rust/pull/31551
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[1.8so]: https://github.com/rust-lang/rust/pull/31333
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[1.8st]: https://github.com/rust-lang/rust/pull/29520
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[1.8t]: https://github.com/rust-lang/rust/pull/31358
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[1.8tn]: https://github.com/rust-lang/rust/pull/30882
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[1.8u]: https://github.com/rust-lang/rust/pull/31793
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[1.8v]: https://github.com/rust-lang/rust/pull/31757
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[1.8w]: https://github.com/rust-lang/rust/pull/31904
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[RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
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[RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
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[RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
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[RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
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[`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
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[`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
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[`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
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[`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
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[`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
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[`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
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[`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
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[`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
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[`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
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[`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
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[`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
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[`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
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[`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
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[`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
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[`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
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[`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
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[`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
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[`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
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[`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
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[`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
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[`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
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[`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
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[`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
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[`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
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[`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
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[`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
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Version 1.7.0 (2016-03-03)
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==========================
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