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Remove support for compiler plugins. #116412

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merged 2 commits into from
Nov 4, 2023

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nnethercote
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They've been deprecated for four years.

This commit includes the following changes.

  • It eliminates the rustc_plugin_impl crate.
  • It changes the language used for lints in compiler/rustc_driver_impl/src/lib.rs and compiler/rustc_lint/src/context.rs. External lints are now called "loaded" lints, rather than "plugins" to avoid confusion with the old plugins. This only has a tiny effect on the output of -W help.
  • E0457 and E0498 are no longer used.
  • E0463 is narrowed, now only relating to unfound crates, not plugins.
  • The plugin feature was moved from "active" to "removed".
  • It removes the entire plugins chapter from the unstable book.
  • It removes quite a few tests, mostly all of those in tests/ui-fulldeps/plugin/.

Closes #29597.

r? @ghost

@rustbot rustbot added 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. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. labels Oct 4, 2023
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rustbot commented Oct 4, 2023

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

Some changes occurred in src/tools/rust-analyzer

cc @rust-lang/rust-analyzer

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

@nnethercote
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nnethercote commented Oct 4, 2023

I decided to implement the removal to see what it looked like, and to encourage a decision. I did a lot of grepping to catch as much relevant code as possible. There are still plenty of "plugin" mentions for things like linker plugins, which are different.

An FCP will be needed before this can merge, at the minimum.

Cargo will need some adjustment, to remove the plugin = true option under [lib]. src/doc/book/redirects/compiler-plugins.md will also need adjustment to avoid some test failures.

Servo is often given as a reason for keeping plugin support, but @SimonSapin said this 18 months ago:

Activity in the Servo project has been low lately and will be in the forseeable future. If a better API becomes available, it’s not clear when or if we’d be able to migrate the GC rooting lint to it. Given this, I feel it’s probably not fair to expect rustc to indefinitely keep the burden of maintaining plugin support for Servo’s sake.

Servo has become more active again recently. I don't know if that has any impact on the decision. Four years of deprecation is a long time!

@@ -262,24 +262,6 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
naked_functions, experimental!(naked)
),

// Plugins:
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Given that this is a no-op and we're currently unable to do syncs, would you mind dropping this change and optionally filing it against the RA repo?

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Sure, if this PR is approved I can do that.

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@compiler-errors compiler-errors removed T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Oct 5, 2023
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I think the PR description justifies the removal, but also see this zulip thread for justification.

@rfcbot fcp merge

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rfcbot commented Oct 5, 2023

Team member @compiler-errors has proposed to merge this. The next step is review by the rest of the tagged team members:

Concerns:

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

@rfcbot rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. labels Oct 5, 2023
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petrochenkov commented Oct 5, 2023

@rfcbot concern servo-buy-in

The main (and only?) reason why this feature wasn't removed several years ago is its servo use case.
It needs to be explicitly confirmed that either servo can migrate to something else, or can remove its lints, or is no longer important enough to care about.

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@rfcbot concern servo-buy-in

@matthewjasper
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previous attempt at this: #64675

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bors commented Oct 5, 2023

☔ The latest upstream changes (presumably #116455) made this pull request unmergeable. Please resolve the merge conflicts.

@nnethercote
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Servo is often given as a reason for keeping plugin support, but @SimonSapin said this 18 months ago:

Activity in the Servo project has been low lately and will be in the forseeable future. If a better API becomes available, it’s not clear when or if we’d be able to migrate the GC rooting lint to it. Given this, I feel it’s probably not fair to expect rustc to indefinitely keep the burden of maintaining plugin support for Servo’s sake.

Servo has become more active again recently. I don't know if that has any impact on the decision. Four years of deprecation is a long time!

cc some Servo people for input: @mrobinson, @emilio, @mukilan, @sagudev, @jdm, @Manishearth

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Manishearth commented Oct 5, 2023

It's still used in servo for GC safety, yes, and people have been actively working on Servo again.

It is possible servo could move to one of the custom lint frameworks out there, or potentially turn this into a clippy restriction lint (sufficiently generic with attributes so that others can use it)

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jdm commented Oct 6, 2023

Yeah, I don't think anything has really changed here from what's been previously articulated in #64675. Obviously it would be easier for Servo if this removal didn't happen, but I recognize that the project holds much less influence over the process than it once did (and that's probably a good thing, to be honest). We had a discussion about whether a linter alternative could work in https://servo.zulipchat.com/#narrow/stream/263398-general/topic/Dylint.

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Right, so we're in a "nothing has changed in three years" situation. I'm really hoping to avoid having this long-deprecated, long-unmaintained feature kept around indefinitely.

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workingjubilee commented Oct 6, 2023

Servo will have 100% buy-in on putting in the necessary maintenance work, one way or another, if it is removed now and they wish to use a stable version of 1.75, or the nightly immediately after this lands.

There are many reasons to smooth a transition path for users of nightly features, but the existing grace period has been exceptional.

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I will say, while servo is the only permanent user that I know of, having a permaunstable plugin API like this has been useful at various times and imo is a good thing to have. Similarly, clang has the unstable clang plugin API that a lot of tools use.

I'd be surprised if this were a maintenance burden: to me "it's been around for years and nobody has tried to remove it yet" feels more due to it not getting in the way of anything, but I could be wrong. servo hasn't had major pull in the rust project for ages so I'd be surprised if the reason was that it did get in the way but people decided not to remove it because of servo.

(while I'm still somewhat biased here; I will note that I haven't written code on servo/servo for ages and wouldn't be directly affected by this decision. I'm just a fan of us having such an API. I've found both the rust and clang plugin APIs to be super useful for various operations)

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workingjubilee commented Oct 6, 2023

I'd be surprised if this were a maintenance burden: to me "it's been around for years and nobody has tried to remove it yet" feels more due to it not getting in the way of anything, but I could be wrong. servo hasn't had major pull in the rust project for ages so I'd be surprised if the reason was that it did get in the way but people decided not to remove it because of servo.

It is actually absurdly annoying to have around, and I have complained about it periodically, because the tests are almost always failing on actual local builds on platforms that aren't x86-64 Linux in my experience, which tricks contributors into thinking they broke something. And I have no idea why that only happens in local builds and not in the test suite, It Just Does, somehow. It greatly inconvenienced me the entire time I was trying to contribute to Rust while using Windows as my OS. I at some point stopped using Windows, but I have had to repeatedly reassure other contributors that no, they didn't break anything. If I had the courage and knowledge to do so, then, I would've opened this very same PR years ago.

So yes, this is exactly why. Literally, petrochenkov raised a concern based on this reason.

No one is maintaining this interface, that I am aware of, and rustc wrappers like your very own clippy actually work in a cross-platform way, and are capable of more besides.

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Okay, thanks, in which case I feel comfortable about having this removed. I think such a feature would be valuable to have in the long run, I agree that it should be maintained and should not be retained if it is at all a current maintenance burden, which it clearly is.

(And future attempts to re-add this can refer to this thread to understand what things need to be resolved for such a feature to be Good)

@sagudev
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sagudev commented Oct 6, 2023

I think servo should no longer be problematic, I made prototype in servo/servo#30508 (with all of our lints ported), now I only need to polish integration with servo. It would be nice if this PR waited for servo/servo#30508 to land in servo (which should be in a week).

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Finished benchmarking commit (5020f7c): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-10.1% [-23.2%, -0.9%] 8
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) -10.1% [-23.2%, -0.9%] 8

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
1.4% [1.1%, 1.8%] 3
Improvements ✅
(primary)
-2.1% [-3.5%, -0.7%] 4
Improvements ✅
(secondary)
-1.1% [-1.5%, -0.5%] 5
All ❌✅ (primary) -2.1% [-3.5%, -0.7%] 4

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-9.3% [-19.0%, -1.9%] 7
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) -9.3% [-19.0%, -1.9%] 7

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 635.435s -> 634.085s (-0.21%)
Artifact size: 304.48 MiB -> 304.52 MiB (0.02%)

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mati865 commented Nov 4, 2023

Perf improvements are mostly noise.
Previously there was fictional regression in PR that only modified docs: https://perf.rust-lang.org/compare.html?start=9c20ddd956426d577d77cb3f57a7db2227a3c6e9&end=1bb6553b967b69eed9ed8147e78b4f65cfc48e11&stat=instructions:u
After this PR the regression has disappeared.

bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Nov 6, 2023
84: Automated pull from upstream `master` r=Dajamante a=github-actions[bot]


This PR pulls the following changes from the upstream repository:

* rust-lang/rust#117585
* rust-lang/rust#117576
* rust-lang/rust#96979
* rust-lang/rust#117191
* rust-lang/rust#117179
* rust-lang/rust#117574
* rust-lang/rust#117537
* rust-lang/rust#117608
  * rust-lang/rust#117596
  * rust-lang/rust#117588
  * rust-lang/rust#117524
  * rust-lang/rust#116017
* rust-lang/rust#117504
* rust-lang/rust#117469
* rust-lang/rust#116218
* rust-lang/rust#117589
* rust-lang/rust#117581
* rust-lang/rust#117503
* rust-lang/rust#117590
  * rust-lang/rust#117583
  * rust-lang/rust#117570
  * rust-lang/rust#117562
  * rust-lang/rust#117534
  * rust-lang/rust#116894
  * rust-lang/rust#110340
* rust-lang/rust#113343
* rust-lang/rust#117579
* rust-lang/rust#117094
* rust-lang/rust#117566
* rust-lang/rust#117564
  * rust-lang/rust#117554
  * rust-lang/rust#117550
  * rust-lang/rust#117343
* rust-lang/rust#115274
* rust-lang/rust#117540
* rust-lang/rust#116412
* rust-lang/rust#115333
* rust-lang/rust#117507
* rust-lang/rust#117538
  * rust-lang/rust#117533
  * rust-lang/rust#117523
  * rust-lang/rust#117520
  * rust-lang/rust#117505
  * rust-lang/rust#117434
* rust-lang/rust#117535
* rust-lang/rust#117510
* rust-lang/rust#116439
* rust-lang/rust#117508



Co-authored-by: Ben Wiederhake <[email protected]>
Co-authored-by: SabrinaJewson <[email protected]>
Co-authored-by: J-ZhengLi <[email protected]>
Co-authored-by: koka <[email protected]>
Co-authored-by: bjorn3 <[email protected]>
Co-authored-by: Joshua Liebow-Feeser <[email protected]>
Co-authored-by: lengyijun <[email protected]>
Co-authored-by: Zalathar <[email protected]>
Co-authored-by: Oli Scherer <[email protected]>
Co-authored-by: Philipp Krones <[email protected]>
Co-authored-by: y21 <[email protected]>
Co-authored-by: bors <[email protected]>
Co-authored-by: bohan <[email protected]>
epage added a commit to epage/cargo that referenced this pull request Nov 6, 2023
Compiler plugins were removed in rust-lang/rust#116412, so we don't need
these tests.

As for the `plugin` field on build-targets, it appears to be
[stable-but-deprecated](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-plugin-field),
so I left it alone
epage added a commit to epage/cargo that referenced this pull request Nov 6, 2023
Compiler plugins were removed in rust-lang/rust#116412, so we don't need
these tests.

As for the `plugin` field on build-targets, it appears to be
[stable-but-deprecated](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-plugin-field),
so I left it alone
bors added a commit to rust-lang/cargo that referenced this pull request Nov 6, 2023
tests: Remove plugin tests

Compiler plugins were removed in rust-lang/rust#116412, so we don't need these tests.

As for the `plugin` field on build-targets, it appears to be [stable-but-deprecated](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-plugin-field), so I left it alone
@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Nov 9, 2023
weihanglo pushed a commit to weihanglo/cargo that referenced this pull request Nov 19, 2023
Compiler plugins were removed in rust-lang/rust#116412, so we don't need
these tests.

As for the `plugin` field on build-targets, it appears to be
[stable-but-deprecated](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#the-plugin-field),
so I left it alone
@nnethercote
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Postscript: @bjorn3's suggestion to move lint registration earlier was very useful. I did that in #117649, and it led to more clean-ups in #117993 and #118002. Combined with some recent related improvements I made in #117268, #117376, and #117475, and rustc_driver_impl::run_compiler and rustc_interface::interface::run_compiler are both looking quite a bit simpler and more readable than they used to. It's nice to see.

mfrischknecht added a commit to mfrischknecht/nixpkgs that referenced this pull request Jan 25, 2024
Rust compiler plugins have been entirely removed after having been
deprecated for years [1]. This caused the build of `aw-server-rust`
to break because its `aw-server` crate still contained the respective
crate attribute to enable the feature.

This attribute has already been removed upstream along with other
no longer used unstable feature opt-ins [2]. This change pulls in
the respective commit with `fetchpatch` and filters it down to
only the changes in `aw-server/src/lib.rs`, which fixes the build
for now. The patch should be removable with the next release
(0.12.3).

[1]: rust-lang/rust#116412
[2]: https://github.com/ActivityWatch/aw-server-rust/commit/e1cd761d2f0a9309eb851b59732c2567a7ae2d3a.patch
HimoriK added a commit to HimoriK/bookedit that referenced this pull request Feb 2, 2024
* Typo

Typo, filename is now file_path.

* rst 

restore `value`

* Fix broken nostarch URL

* Change CamelCase to UpperCamelCase

Brings the terminology in line with the rest of the project, see
<rust-lang/rfcs#2389>.

Connects to rust-lang#2194.

* Update to Rust 1.66.1

* Update to Rust 1.67.1

* Removed "," typo on ch03-01 line 85

Removed extra comma on line 85.

We’ll cover types and type annotations in the next section, “Data Types`,`”, so don’t worry about the details right now.

* simplify COPYRIGHT file

* Fix grammar

Add the word 'of' to fix the grammar.

* Update copyright in LICENSE-APACHE

Looks like we forgot to fill this in when we added the license file. ;)

* Correct `i32` formatting in ch19-05

* Remove adjective about what kind of number this is

* Improve sentence

* Small wording changes

* redirects: change link for `#![no_std]` tutorial

* Fix cargo doc links

* Prepare for removal of compiler plugin support.

rust-lang/rust#116412 will remove support for
compiler plugins from rustc, which includes the entry in The Rust
Unstable Book. This commit removes a link to that entry so it won't be
broken when that PR merges.

* Fix mdBook links

* Fixed 'troubleshooting' link

* Update ch01-02-hello-world.md

* Update ch01-02-hello-world.md

---------

Co-authored-by: abiphone <[email protected]>
Co-authored-by: printfn <[email protected]>
Co-authored-by: Carol (Nichols || Goulding) <[email protected]>
Co-authored-by: Mateus Rodolfo <[email protected]>
Co-authored-by: Pietro Albini <[email protected]>
Co-authored-by: Vishal Lama <[email protected]>
Co-authored-by: Jason Walton <[email protected]>
Co-authored-by: Shinya Fujino <[email protected]>
Co-authored-by: Jaime Terreu <[email protected]>
Co-authored-by: Mike Krisher <[email protected]>
Co-authored-by: kadiwa <[email protected]>
Co-authored-by: Eric Huss <[email protected]>
Co-authored-by: Nicholas Nethercote <[email protected]>
Co-authored-by: Marcus Stollsteimer <[email protected]>
Co-authored-by: Aryan Malik <[email protected]>
weihanglo added a commit to weihanglo/cargo that referenced this pull request Feb 20, 2024
Copy from <rust-lang#10469 (comment)>:

> I've never been entirely clear why it does this. rust-lang#4006 didn't really
> explain why it added the corresponding host_dylib_path. I can't envision
> a scenario where it matters. I think compiler plugins and proc-macros
> should load just fine, since libstd.so should already be loaded by the
> compiler. Also, rustc uses rpath these days, and on Windows libstd.so is
> placed in the bin directory which will be searched first anyways.
>
> On balance, I think it should be safe to just remove sysroot_host_libdir.
> I can't come up with a scenario where it matters, at least on
> windows/macos/linux. One issue is that this is most likely to affect
> plugins, but those are deprecated and I think only Servo was the real
> holdout. A concern is that nobody is going to test this use case before
> it hits stable.

Also,

* compiler plugins were removed rust-lang/rust#116412
* servo has moved off from plugins: servo/servo#30508

So should generally be fine.
weihanglo added a commit to weihanglo/cargo that referenced this pull request Feb 20, 2024
Copy from <rust-lang#10469 (comment)>:

> I've never been entirely clear why it does this. rust-lang#4006 didn't really
> explain why it added the corresponding host_dylib_path. I can't envision
> a scenario where it matters. I think compiler plugins and proc-macros
> should load just fine, since libstd.so should already be loaded by the
> compiler. Also, rustc uses rpath these days, and on Windows libstd.so is
> placed in the bin directory which will be searched first anyways.
>
> On balance, I think it should be safe to just remove sysroot_host_libdir.
> I can't come up with a scenario where it matters, at least on
> windows/macos/linux. One issue is that this is most likely to affect
> plugins, but those are deprecated and I think only Servo was the real
> holdout. A concern is that nobody is going to test this use case before
> it hits stable.

Also,

* compiler plugins were removed rust-lang/rust#116412
* servo has moved off from plugins: servo/servo#30508

So should generally be fine.
stupendoussuperpowers pushed a commit to stupendoussuperpowers/cargo that referenced this pull request Feb 28, 2024
Copy from <rust-lang#10469 (comment)>:

> I've never been entirely clear why it does this. rust-lang#4006 didn't really
> explain why it added the corresponding host_dylib_path. I can't envision
> a scenario where it matters. I think compiler plugins and proc-macros
> should load just fine, since libstd.so should already be loaded by the
> compiler. Also, rustc uses rpath these days, and on Windows libstd.so is
> placed in the bin directory which will be searched first anyways.
>
> On balance, I think it should be safe to just remove sysroot_host_libdir.
> I can't come up with a scenario where it matters, at least on
> windows/macos/linux. One issue is that this is most likely to affect
> plugins, but those are deprecated and I think only Servo was the real
> holdout. A concern is that nobody is going to test this use case before
> it hits stable.

Also,

* compiler plugins were removed rust-lang/rust#116412
* servo has moved off from plugins: servo/servo#30508

So should generally be fine.
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Mar 3, 2024
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions.
 * For an external LLVM, set dependency of llvm >= 16, in accordance
   with the upstream changes.
 * Mark that on NetBSD we now need >= 9.0, so 8.x is no longer supported.
 * On NetBSD/sparc64 10.x, we now need GCC 12 to build the embedded
   LLVM, which is version 17; apparently GCC 10.4 or 10.5 mis-compiles it,
   resulting in an illegal instruction fault during the build.
   Ref. rust-lang/rust#117231

Upstream changes:

Version 1.75.0 (2023-12-28)
==========================

- [Stabilize `async fn` and return-position `impl Trait` in traits.]
  (rust-lang/rust#115822)
- [Allow function pointer signatures containing `&mut T` in `const` contexts.]
  (rust-lang/rust#116015)
- [Match `usize`/`isize` exhaustively with half-open ranges.]
  (rust-lang/rust#116692)
- [Guarantee that `char` has the same size and alignment as `u32`.]
  (rust-lang/rust#116894)
- [Document that the null pointer has the 0 address.]
  (rust-lang/rust#116988)
- [Allow partially moved values in `match`.]
  (rust-lang/rust#103208)
- [Add notes about non-compliant FP behavior on 32bit x86 targets.]
  (rust-lang/rust#113053)
- [Stabilize ratified RISC-V target features.]
  (rust-lang/rust#116485)

Compiler
--------

- [Rework negative coherence to properly consider impls that only
  partly overlap.] (rust-lang/rust#112875)
- [Bump `COINDUCTIVE_OVERLAP_IN_COHERENCE` to deny, and warn in dependencies.]
  (rust-lang/rust#116493)
- [Consider alias bounds when computing liveness in NLL.]
  (rust-lang/rust#116733)
- [Add the V (vector) extension to the `riscv64-linux-android` target spec.]
  (rust-lang/rust#116618)
- [Automatically enable cross-crate inlining for small functions]
  (rust-lang/rust#116505)
- Add several new tier 3 targets:
    - [`csky-unknown-linux-gnuabiv2hf`]
      (rust-lang/rust#117049)
    - [`i586-unknown-netbsd`]
      (rust-lang/rust#117170)
    - [`mipsel-unknown-netbsd`]
      (rust-lang/rust#117356)

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

Libraries
---------

- [Override `Waker::clone_from` to avoid cloning `Waker`s unnecessarily.]
  (rust-lang/rust#96979)
- [Implement `BufRead` for `VecDeque<u8>`.]
  (rust-lang/rust#110604)
- [Implement `FusedIterator` for `DecodeUtf16` when the inner iterator does.]
  (rust-lang/rust#110729)
- [Implement `Not, Bit{And,Or}{,Assign}` for IP addresses.]
  (rust-lang/rust#113747)
- [Implement `Default` for `ExitCode`.]
  (rust-lang/rust#114589)
- [Guarantee representation of None in NPO]
  (rust-lang/rust#115333)
- [Document when atomic loads are guaranteed read-only.]
  (rust-lang/rust#115577)
- [Broaden the consequences of recursive TLS initialization.]
  (rust-lang/rust#116172)
- [Windows: Support sub-millisecond sleep.]
  (rust-lang/rust#116461)
- [Fix generic bound of `str::SplitInclusive`'s `DoubleEndedIterator` impl]
  (rust-lang/rust#100806)
- [Fix exit status / wait status on non-Unix `cfg(unix)` platforms.]
  (rust-lang/rust#115108)

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

- [`Atomic*::from_ptr`]
  (https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicUsize.html#method.from_ptr)
- [`FileTimes`]
  (https://doc.rust-lang.org/stable/std/fs/struct.FileTimes.html)
- [`FileTimesExt`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTimesExt.html)
- [`File::set_modified`]
  (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_modified)
- [`File::set_times`]
  (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_times)
- [`IpAddr::to_canonical`]
  (https://doc.rust-lang.org/stable/core/net/enum.IpAddr.html#method.to_canonical)
- [`Ipv6Addr::to_canonical`]
  (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_canonical)
- [`Option::as_slice`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_slice)
- [`Option::as_mut_slice`]
  (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_mut_slice)
- [`pointer::byte_add`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_add)
- [`pointer::byte_offset`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset)
- [`pointer::byte_offset_from`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset_from)
- [`pointer::byte_sub`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_sub)
- [`pointer::wrapping_byte_add`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_add)
- [`pointer::wrapping_byte_offset`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_offset)
- [`pointer::wrapping_byte_sub`]
  (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_sub)

These APIs are now stable in const contexts:

- [`Ipv6Addr::to_ipv4_mapped`]
  (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_ipv4_mapped)
- [`MaybeUninit::assume_init_read`]
  (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_read)
- [`MaybeUninit::zeroed`]
  (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.zeroed)
- [`mem::discriminant`]
  (https://doc.rust-lang.org/stable/core/mem/fn.discriminant.html)
- [`mem::zeroed`]
  (https://doc.rust-lang.org/stable/core/mem/fn.zeroed.html)

Cargo
-----

- [Add new packages to `[workspace.members]` automatically.]
  (rust-lang/cargo#12779)
- [Allow version-less `Cargo.toml` manifests.]
  (rust-lang/cargo#12786)
- [Make browser links out of HTML file paths.]
  (rust-lang/cargo#12889)

Rustdoc
-------

- [Accept less invalid Rust in rustdoc.]
  (rust-lang/rust#117450)
- [Document lack of object safety on affected traits.]
  (rust-lang/rust#113241)
- [Hide `#[repr(transparent)]` if it isn't part of the public ABI.]
  (rust-lang/rust#115439)
- [Show enum discriminant if it is a C-like variant.]
  (rust-lang/rust#116142)

Compatibility Notes
-------------------

- [FreeBSD targets now require at least version 12.]
  (rust-lang/rust#114521)
- [Formally demote tier 2 MIPS targets to tier 3.]
  (rust-lang/rust#115238)
- [Make misalignment a hard error in `const` contexts.]
  (rust-lang/rust#115524)
- [Fix detecting references to packed unsized fields.]
  (rust-lang/rust#115583)
- [Remove support for compiler plugins.]
  (rust-lang/rust#116412)
jieyouxu added a commit to jieyouxu/rust that referenced this pull request Apr 29, 2024
…ouxu

[Refactor] Rename `Lint` and `LintGroup`'s `is_loaded` to `is_externally_loaded`

The field being named `is_loaded` was very confusing. Turns out it's true for lints that are registered by external tools like Clippy (I had to look at rust-lang#116412 to know what the variable meant). So I renamed `is_loaded` to `is_externally_loaded` and added some docs.
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Apr 29, 2024
Rollup merge of rust-lang#124522 - blyxyas:refactor-is-loaded, r=jieyouxu

[Refactor] Rename `Lint` and `LintGroup`'s `is_loaded` to `is_externally_loaded`

The field being named `is_loaded` was very confusing. Turns out it's true for lints that are registered by external tools like Clippy (I had to look at rust-lang#116412 to know what the variable meant). So I renamed `is_loaded` to `is_externally_loaded` and added some docs.
github-actions bot pushed a commit to rust-lang/miri that referenced this pull request May 3, 2024
[Refactor] Rename `Lint` and `LintGroup`'s `is_loaded` to `is_externally_loaded`

The field being named `is_loaded` was very confusing. Turns out it's true for lints that are registered by external tools like Clippy (I had to look at rust-lang/rust#116412 to know what the variable meant). So I renamed `is_loaded` to `is_externally_loaded` and added some docs.
charmitro pushed a commit to charmitro/cargo that referenced this pull request Sep 13, 2024
Copy from <rust-lang#10469 (comment)>:

> I've never been entirely clear why it does this. rust-lang#4006 didn't really
> explain why it added the corresponding host_dylib_path. I can't envision
> a scenario where it matters. I think compiler plugins and proc-macros
> should load just fine, since libstd.so should already be loaded by the
> compiler. Also, rustc uses rpath these days, and on Windows libstd.so is
> placed in the bin directory which will be searched first anyways.
>
> On balance, I think it should be safe to just remove sysroot_host_libdir.
> I can't come up with a scenario where it matters, at least on
> windows/macos/linux. One issue is that this is most likely to affect
> plugins, but those are deprecated and I think only Servo was the real
> holdout. A concern is that nobody is going to test this use case before
> it hits stable.

Also,

* compiler plugins were removed rust-lang/rust#116412
* servo has moved off from plugins: servo/servo#30508

So should generally be fine.
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Tracking issue for plugin stabilization (plugin, plugin_registrar features)