diff --git a/posts/2022-04-07-Rust-1.60.0.md b/posts/2022-04-07-Rust-1.60.0.md new file mode 100644 index 000000000..4a96a1c95 --- /dev/null +++ b/posts/2022-04-07-Rust-1.60.0.md @@ -0,0 +1,220 @@ +--- +layout: post +title: "Announcing Rust 1.60.0" +author: The Rust Release Team +release: true +--- + +The Rust team is happy to announce a new version of Rust, 1.60.0. Rust is a programming language empowering everyone to build reliable and efficient software. + +If you have a previous version of Rust installed via rustup, you can get 1.60.0 with: + +```console +rustup update stable +``` + +If you don't have it already, you can [get `rustup`][install] +from the appropriate page on our website, and check out the +[detailed release notes for 1.60.0][notes] on GitHub. +If you'd like to help us out by testing future releases, you might consider updating locally to use +the beta channel (`rustup default beta`) or the nightly channel (`rustup default nightly`). Please [report] any bugs you might come across! + +[install]: https://www.rust-lang.org/install.html +[notes]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1600-2022-04-07 +[report]: https://github.com/rust-lang/rust/issues/new/choose + +## What's in 1.60.0 stable + +### Source-based Code Coverage + +Support for LLVM-based coverage instrumentation has been stabilized in rustc. You can try this out on your code by rebuilding your code with `-Cinstrument-coverage`, for example like this: + +```shell= +RUSTFLAGS="-C instrument-coverage" cargo build +``` + +After that, you can run the resulting binary, which will produce a +`default.profraw` file in the current directory. (The path and filename can be +overriden by an environment variable; see +[documentation](https://doc.rust-lang.org/stable/rustc/instrument-coverage.html#running-the-instrumented-binary-to-generate-raw-coverage-profiling-data) +for details). + +The `llvm-tools-preview` component includes `llvm-profdata` for processing and +merging raw profile output (coverage region execution counts); and `llvm-cov` +for report generation. `llvm-cov` combines the processed output, from +`llvm-profdata`, and the binary itself, because the binary embeds a mapping from +counters to actual source code regions. + +```shell= +rustup component add llvm-tools-preview +$(rustc --print sysroot)/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -sparse default.profraw -o default.profdata +$(rustc --print sysroot)/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov show -Xdemangler=rustfilt target/debug/coverage-testing \ + -instr-profile=default.profdata \ + -show-line-counts-or-regions \ + -show-instantiations +``` + +The above commands on a simple helloworld binary produce this annotated report, showing that each line of the input was covered. + +``` + 1| 1|fn main() { + 2| 1| println!("Hello, world!"); + 3| 1|} +``` + +For more details, please read the +[documentation](https://doc.rust-lang.org/rustc/instrument-coverage.html) in the +rustc book. The baseline functionality is stable and will exist in some form +in all future Rust releases, but the specific output format and LLVM tooling which +produces it are subject to change. For this reason, it is important to make +sure that you use the same version for both the `llvm-tools-preview` and the +rustc binary used to compile your code. + +### `cargo --timings` + +Cargo has stabilized support for collecting information on build with the `--timings` flag. + +```shell +$ cargo build --timings + Compiling hello-world v0.1.0 (hello-world) + Timing report saved to target/cargo-timings/cargo-timing-20220318T174818Z.html + Finished dev [unoptimized + debuginfo] target(s) in 0.98s +``` + +The report is also copied to `target/cargo-timings/cargo-timing.html`. A report on the release build of Cargo has been put up [here](/images/2022-04-07-timing.html). These reports can be useful for improving build performance. +More information about the timing reports may be found in the [documentation](https://doc.rust-lang.org/nightly/cargo/reference/timings.html). + +### New syntax for Cargo features + +This release introduces two new changes to improve support for [Cargo features](https://doc.rust-lang.org/cargo/reference/features.html) and how they interact with [optional dependencies](https://doc.rust-lang.org/cargo/reference/features.html#optional-dependencies): Namespaced dependencies and weak dependency features. + +Cargo has long supported features along with optional dependencies, as illustrated by the snippet below. + +```toml +[dependencies] +jpeg-decoder = { version = "0.1.20", default-features = false, optional = true } + +[features] +# Enables parallel processing support by enabling the "rayon" feature of jpeg-decoder. +parallel = ["jpeg-decoder/rayon"] +``` + +There are two things to note in this example: +* The optional dependency `jpeg-decoder` implicitly defines a feature of the same name. Enabling the `jpeg-decoder` feature will enable the `jpeg-decoder` dependency. +* The `"jpeg-decoder/rayon"` syntax enables the `jpeg-decoder` dependency *and* enables the `jpeg-decoder` dependency's `rayon` feature. + +Namespaced features tackles the first issue. You can now use the `dep:` prefix in the `[features]` table to explicitly refer to an optional dependency without implicitly exposing it as a feature. This gives you more control on how to define the feature corresponding to the optional dependency including hiding optional dependencies behind more descriptive feature names. + +Weak dependency features tackle the second issue where the `"optional-dependency/feature-name"` syntax would always enable `optional-dependency`. However, often you want to enable the feature on the optional dependency *only* if some other feature has enabled the optional dependency. Starting in 1.60, you can add a ? as in `"package-name?/feature-name"` which will only enable the given feature if something else has enabled the optional dependency. + +For example, let's say we have added some serialization support to our library, and it requires enabling a corresponding feature in some optional dependencies. That can be done like this: + +```toml +[dependencies] +serde = { version = "1.0.133", optional = true } +rgb = { version = "0.8.25", optional = true } + +[features] +serde = ["dep:serde", "rgb?/serde"] +``` + +In this example, enabling the serde feature will enable the serde dependency. It will also enable the serde feature for the rgb dependency, but only if something else has enabled the rgb dependency. + +### Incremental compilation status + +Incremental compilation is re-enabled for the 1.60 release. The Rust team continues to work on fixing bugs in incremental, but no problems causing widespread breakage are known at this time, so we have chosen to reenable incremental compilation. Additionally, the compiler team is continuing to work on long-term strategy to avoid future problems of this kind. That process is in relatively early days, so we don't have anything to share yet on that front. + +### `Instant` monotonicity guarantees + +On all platforms `Instant` will try to use an OS API that guarantees monotonic +behavior if available (which is the case on all tier 1 platforms). In practice +such guarantees are -- under rare circumstances -- broken by hardware, +virtualization, or operating system bugs. To work around these bugs and platforms +not offering monotonic clocks, `Instant::duration_since`, `Instant::elapsed` and +`Instant::sub` now saturate to zero. In older Rust versions this led to a panic +instead. `Instant::checked_duration_since` can be used to detect and handle +situations where monotonicity is violated, or `Instant`s are subtracted in the +wrong order. + +This workaround obscures programming errors where earlier and later instants are +accidentally swapped. For this reason future Rust versions may reintroduce +panics in at least those cases, if possible and efficient. + +Prior to 1.60, the monotonicity guarantees were provided through mutexes or +atomics in std, which can introduce large performance overheads to +`Instant::now()`. Additionally, the panicking behavior meant that Rust software +could panic in a subset of environments, which was largely undesirable, as the +authors of that software may not be able to fix or upgrade the operating system, +hardware, or virtualization system they are running on. Further, introducing +unexpected panics into these environments made Rust software less reliable and +portable, which is of higher concern than exposing typically uninteresting +platform bugs in monotonic clock handling to end users. + +### Stabilized APIs + +The following methods and trait implementations are now stabilized: + +- [`Arc::new_cyclic`][arc_new_cyclic] +- [`Rc::new_cyclic`][rc_new_cyclic] +- [`slice::EscapeAscii`][slice_escape_ascii] +- [`<[u8]>::escape_ascii`][slice_u8_escape_ascii] +- [`u8::escape_ascii`][u8_escape_ascii] +- [`Vec::spare_capacity_mut`][vec_spare_capacity_mut] +- [`MaybeUninit::assume_init_drop`][assume_init_drop] +- [`MaybeUninit::assume_init_read`][assume_init_read] +- [`i8::abs_diff`][i8_abs_diff] +- [`i16::abs_diff`][i16_abs_diff] +- [`i32::abs_diff`][i32_abs_diff] +- [`i64::abs_diff`][i64_abs_diff] +- [`i128::abs_diff`][i128_abs_diff] +- [`isize::abs_diff`][isize_abs_diff] +- [`u8::abs_diff`][u8_abs_diff] +- [`u16::abs_diff`][u16_abs_diff] +- [`u32::abs_diff`][u32_abs_diff] +- [`u64::abs_diff`][u64_abs_diff] +- [`u128::abs_diff`][u128_abs_diff] +- [`usize::abs_diff`][usize_abs_diff] +- [`Display for io::ErrorKind`][display_error_kind] +- [`From for ExitCode`][from_u8_exit_code] +- [`Not for !` (the "never" type)][not_never] +- [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops] +- [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected] + +### Other changes + +There are other changes in the Rust 1.60.0 release. Check out what changed in +[Rust](https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1600-2022-04-07), +[Cargo](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-160-2022-04-07), +and [Clippy](https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-160). + +### Contributors to 1.60.0 + +Many people came together to create Rust 1.60.0. +We couldn't have done it without all of you. +[Thanks!](https://thanks.rust-lang.org/rust/1.60.0/) + +[arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic +[rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic +[slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html +[slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii +[u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii +[vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut +[assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop +[assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read +[i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff +[i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff +[i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff +[i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff +[i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff +[isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff +[u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff +[u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff +[u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff +[u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff +[u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff +[usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff +[display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display +[from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E +[not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not +[wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations +[is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html diff --git a/static/images/2022-04-07-timing.html b/static/images/2022-04-07-timing.html new file mode 100644 index 000000000..50332b8ae --- /dev/null +++ b/static/images/2022-04-07-timing.html @@ -0,0 +1,10116 @@ + + + + Cargo Build Timings — cargo 0.62.0 + + + + + +

Cargo Build Timings

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Targets:cargo 0.62.0 (lib, bin "cargo")
Profile:release
Fresh units:0
Dirty units:180
Total units:180
Max concurrency:13 (jobs=12 ncpu=12)
Build start:2022-03-18T17:50:29Z
Total time:58.9s
rustc:rustc 1.60.0-beta.4 (99f967e7e 2022-03-14)
Host: x86_64-unknown-linux-gnu
Target: x86_64-unknown-linux-gnu
Max (global) rustc threads concurrency:0
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91.hex v0.4.20.4s0.1s (19%)default, std
92.log v0.4.110.4s0.2s (51%)std
93.proc-macro2 v1.0.29 build script0.4sdefault, proc-macro
94.openssl-probe v0.1.20.4s0.3s (70%)
95.serde v1.0.130 build script0.4sdefault, derive, serde_derive, std
96.getrandom v0.1.140.4s0.2s (56%)std
97.anyhow v1.0.37 build script0.3sdefault, std
98.regex-automata v0.1.100.3s0.1s (25%)
99.syn v1.0.76 build script0.3sclone-impls, default, derive, parsing, printing, proc-macro, quote
100.crc32fast v1.2.0 build script0.3sdefault, std
101.ryu v1.0.50.3s0.2s (53%)
102.os_str_bytes v6.0.00.3s0.1s (38%)default, memchr, raw_os_str
103.filetime v0.2.120.3s0.2s (52%)
104.rand_core v0.5.10.3s0.1s (43%)alloc, getrandom, std
105.ryu v1.0.5 build script0.3s
106.bitflags v1.2.1 build script0.3sdefault
107.serde_derive v1.0.130 build script0.3sdefault
108.crc32fast v1.2.00.3s0.2s (52%)default, std
109.getrandom v0.1.14 build script0.3sstd
110.openssl v0.10.30 build script0.3s
111.im-rc v15.0.0 build script0.3s
112.memchr v2.4.1 build script0.3sdefault, std, use_std
113.home v0.5.30.3s0.2s (59%)
114.libnghttp2-sys v0.1.4+1.41.00.3s0.1s (41%)
115.tinyvec v0.3.30.3s0.0s (3%)alloc, default
116.serde_ignored v0.1.20.3s0.0s (18%)
117.serde_json v1.0.57 build script0.3sdefault, raw_value, std
118.sized-chunks v0.6.20.3s0.0s (5%)default, std
119.curl v0.4.42 build script0.3sdefault, http2, openssl-probe, openssl-sys, ssl
120.openssl-sys v0.9.58 build script (run)0.3s
121.log v0.4.11 build script0.3sstd
122.kstring v1.0.60.3s0.1s (22%)default, max_inline, serde
123.crossbeam-utils v0.8.1 build script0.3sdefault, lazy_static, std
124.indexmap v1.8.0 build script0.3sstd
125.crossbeam-utils v0.7.2 build script0.3sdefault, lazy_static, std
126.same-file v1.0.60.2s0.1s (45%)
127.anyhow v1.0.37 build script (run)0.2sdefault, std
128.filetime v0.2.120.2s0.1s (35%)
129.crc32fast v1.2.00.2s0.1s (24%)default, std
130.libgit2-sys v0.13.2+1.4.20.2s0.0s (15%)https, libssh2-sys, openssl-sys, ssh, ssh_key_from_memory
131.indexmap v1.8.0 build script (run)0.2sstd
132.bytesize v1.0.10.2s0.1s (37%)
133.libssh2-sys v0.2.200.2s0.1s (27%)
134.curl-sys v0.4.52+curl-7.81.00.2s0.0s (10%)default, http2, libnghttp2-sys, openssl-sys, ssl
135.vte v0.3.30.2s0.0s (15%)
136.itoa v0.4.60.2s0.0s (5%)
137.either v1.6.10.2s0.0s (6%)
138.lazycell v1.2.10.2s0.0s (14%)
139.unicode-xid v0.2.10.1s0.0s (12%)default
140.unicode-xid v0.2.10.1s0.0s (18%)default
141.libz-sys v1.1.20.1s0.0s (11%)default, libc, stock-zlib
142.utf8parse v0.1.10.1s0.0s (16%)
143.cfg-if v1.0.00.1s0.0s (7%)
144.unicode-width v0.1.80.1s0.0s (6%)default
145.libz-sys v1.1.20.1s0.0s (9%)default, libc, stock-zlib
146.strip-ansi-escapes v0.1.00.1s0.0s (8%)
147.atty v0.2.140.1s0.0s (10%)
148.foreign-types v0.3.20.1s0.0s (9%)
149.bitflags v1.2.10.1s0.0s (14%)default
150.lazy_static v1.4.00.1s0.0s (6%)
151.cfg-if v0.1.100.1s0.0s (6%)
152.matches v0.1.80.1s0.0s (7%)
153.foreign-types-shared v0.1.10.1s0.0s (7%)
154.remove_dir_all v0.5.30.1s0.0s (8%)
155.cfg-if v0.1.100.1s0.0s (12%)
156.fnv v1.0.70.1s0.0s (7%)default, std
157.rustc-workspace-hack v1.0.00.1s0.0s (9%)
158.crc32fast v1.2.0 build script (run)0.1sdefault, std
159.syn v1.0.76 build script (run)0.1sclone-impls, default, derive, parsing, printing, proc-macro, quote
160.libc v0.2.101 build script (run)0.1sdefault, std
161.semver v1.0.4 build script (run)0.1sdefault, serde, std
162.bitflags v1.2.1 build script (run)0.1sdefault
163.serde_derive v1.0.130 build script (run)0.1sdefault
164.proc-macro2 v1.0.29 build script (run)0.1sdefault, proc-macro
165.ryu v1.0.5 build script (run)0.1s
166.im-rc v15.0.0 build script (run)0.1s
167.serde v1.0.130 build script (run)0.1sdefault, derive, serde_derive, std
168.libc v0.2.101 build script (run)0.1sdefault, std
169.crc32fast v1.2.0 build script (run)0.1sdefault, std
170.typenum v1.12.0 build script (run)0.1s
171.cargo v0.62.0 build script (run)0.0s
172.curl-sys v0.4.52+curl-7.81.0 build script (run)0.0sdefault, http2, libnghttp2-sys, openssl-sys, ssl
173.libz-sys v1.1.2 build script (run)0.0sdefault, libc, stock-zlib
174.curl v0.4.42 build script (run)0.0sdefault, http2, openssl-probe, openssl-sys, ssl
175.libz-sys v1.1.2 build script (run)0.0sdefault, libc, stock-zlib
176.memchr v2.4.1 build script (run)0.0sdefault, std, use_std
177.openssl v0.10.30 build script (run)0.0s
178.log v0.4.11 build script (run)0.0sstd
179.getrandom v0.1.14 build script (run)0.0sstd
180.serde_json v1.0.57 build script (run)0.0sdefault, raw_value, std
+ + +