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linker: Synchronize native library search in rustc and linker
Also search for static libraries with alternative naming (`libname.a`) on MSVC when producing executables or dynamic libraries, and not just rlibs.
This unblocks https://github.com/rust-lang/rust/pull/123436.
try-job: x86_64-msvc
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riscv64imac: allow shadow call stack sanitizer
cc `@Darksonn` for shadow call stack sanitizer support on RV64IMAC and RV64GC
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Add `-Zlint-llvm-ir`
This flag is similar to `-Zverify-llvm-ir` and allows us to lint the generated IR.
r? compiler
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debug-fmt-detail option
I'd like to propose a new option that makes `#[derive(Debug)]` generate no-op implementations that don't print anything, and makes `{:?}` in format strings a no-op.
There are a couple of motivations for this:
1. A more thorough stripping of debug symbols. Binaries stripped of debug symbols still retain some of them through `Debug` implementations. It's hard to avoid that without compiler's help, because debug formatting can be used in many places, including dependencies, and their loggers, asserts, panics, etc.
* In my testing it gives about 2% binary size reduction on top of all other binary-minimizing best practices (including `panic_immediate_abort`). There are targets like Web WASM or embedded where users pay attention to binary sizes.
* Users distributing closed-source binaries may not want to "leak" any symbol names as a matter of principle.
2. Adds ability to test whether code depends on specifics of the `Debug` format implementation in unwise ways (e.g. trying to get data unavailable via public interface, or using it as a serialization format). Because current Rust's debug implementation doesn't change, there's a risk of it becoming a fragile de-facto API that [won't be possible to change in the future](https://www.hyrumslaw.com/). An option that "breaks" it can act as a [grease](https://www.rfc-editor.org/rfc/rfc8701.html).
This implementation is a `-Z fmt-debug=opt` flag that takes:
* `full` — the default, current state.
* `none` — makes derived `Debug` and `{:?}` no-ops. Explicit `impl Debug for T` implementations are left unharmed, but `{:?}` format won't use them, so they may get dead-code eliminated if they aren't invoked directly.
* `shallow` — makes derived `Debug` print only the type's name, without recursing into fields. Fieldless enums print their variant names. `{:?}` works.
The `shallow` option is a compromise between minimizing the `Debug` code, and compatibility. There are popular proc-macro crates that use `Debug::fmt` as a way to convert enum values into their Rust source code.
There's a corresponding `cfg` flag: `#[cfg(fmt_debug = "none")]` that can be used in user code to react to this setting to minimize custom `Debug` implementations or remove unnecessary formatting helper functions.
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Update books
## rust-lang/book
4 commits in 04bc1396bb857f35b5dda1d773c9571e1f253304..e7d217be2a75ef1753f0988d6ccaba4d7e376259
2024-08-14 01:19:47 UTC to 2024-08-13 16:51:00 UTC
- Backport/forward port ch12 (rust-lang/book#4008)
- Found some more things to fix in ch7; I forgot to update the snapshot (rust-lang/book#4007)
- Remove redundant sentence. Send to nostarch (rust-lang/book#4006)
- Fix: typo (rust-lang/book#4003)
## rust-lang/edition-guide
5 commits in aeeb287d41a0332c210da122bea8e0e91844ab3e..eeba2cb9c37ab74118a4fb5e5233f7397e4a91f8
2024-08-19 23:28:06 UTC to 2024-08-15 15:12:33 UTC
- 2024: Add rustdoc combined doctests (rust-lang/edition-guide#320)
- Update for unsafe attributes stabilization (rust-lang/edition-guide#319)
- 2024: Add macro-fragment-specifiers. (rust-lang/edition-guide#312)
- Fix deprecated_safe_2024 link (rust-lang/edition-guide#317)
- Add 2024 unsafe functions (rust-lang/edition-guide#304)
## rust-embedded/book
1 commits in 019f3928d8b939ec71b63722dcc2e46330156441..ff5d61d56f11e1986bfa9652c6aff7731576c37d
2024-08-20 07:26:19 UTC to 2024-08-20 07:26:19 UTC
- Use aligned address to demonstrate HardFault (rust-embedded/book#374)
## rust-lang/nomicon
1 commits in 6ecf95c5f2bfa0e6314dfe282bf775fd1405f7e9..14649f15d232d509478206ee9ed5105641aa60d0
2024-08-14 14:49:09 UTC to 2024-08-14 14:49:09 UTC
- CI: Switch to merge queue (rust-lang/nomicon#459)
## rust-lang/reference
14 commits in 62cd0df95061ba0ac886333f5cd7f3012f149da1..0668397076da350c404dadcf07b6cbc433ad3743
2024-08-11 21:06:12 +0000 to 2024-08-27 21:47:20 +0000
- Update enum.md (rust-lang/reference#1354)
- Be consistent about how "Edition differences" is capitalized (rust-lang/reference#1586)
- Sync denied lints with upstream (rust-lang/reference#1589)
- const_eval: update for const-fn float stabilization (rust-lang/reference#1566)
- Add spec identifier syntax to destructors.md (rust-lang/reference#1571)
- Say that `pub(in path)` can't depend on `use` statements (rust-lang/reference#1559)
- bytes inside implicitly const-promoted expressions are immutable (rust-lang/reference#1554)
- Tweak `repr(transparent)` to mention requiring *at most* one non-1-ZST (rust-lang/reference#1568)
- operator expressions: add &raw (rust-lang/reference#1567)
- Rewrite the automatic std link translation, and switch to automatic links (rust-lang/reference#1578)
- Add some basic docs for unsafe attrs (rust-lang/reference#1539)
- don't capitalize Undefined Behavior (rust-lang/reference#1575)
- add the `const` operand to docs for inline assembly (rust-lang/reference#1556)
- Typo: 'a' to 'an' in type-coercions.md (rust-lang/reference#1572)
## rust-lang/rust-by-example
1 commits in 8f94061936e492159f4f6c09c0f917a7521893ff..859786c5bc99301bbc22fc631a5c2b341860da08
2024-08-26 10:30:48 UTC to 2024-08-26 10:30:48 UTC
- Update primitives.md with examples (rust-lang/rust-by-example#1878)
## rust-lang/rustc-dev-guide
7 commits in 43d83780db545a1ed6d45773312fc578987e3968..fa928a6d19e1666d8d811dfe3fd35cdad3b4e459
2024-08-26 14:46:50 UTC to 2024-08-12 21:07:49 UTC
- Fix x.py reference (rust-lang/rustc-dev-guide#2049)
- Update `stabilization_guide.md` (rust-lang/rustc-dev-guide#2034)
- Explain the internal `#[rustc_*]` TEST attributes used for debugging and inside tests (rust-lang/rustc-dev-guide#2046)
- missing char (rust-lang/rustc-dev-guide#2047)
- Replace direct http links to rustc-dev-guide.rust-lang.org (rust-lang/rustc-dev-guide#2044)
- Update index.html, 39. The MIR: fix typo (rust-lang/rustc-dev-guide#2043)
- Update LLVM docs (rust-lang/rustc-dev-guide#2039)
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Allows disabling `fmt::Debug` derive and debug formatting.
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Add Trusty OS as tier 3 target
This PR adds support for the [Trusty secure operating system](https://source.android.com/docs/security/features/trusty) as a Tier 3 supported target. This upstreams [the patch that we have been using](https://cs.android.com/android/platform/superproject/+/master:external/rust/crates/libc/patches/trusty.patch;l=1;drc=122e586e93a534160230dc10ae3474cf31dd8f7f) internally. This also revives https://github.com/rust-lang/rust/pull/103895 which was closed due to inactivity, and is being resumed now that time allows.
And MCP has already been done for adding this platform: rust-lang/compiler-team/issues/568
# Target Tier Policy Acknowledgements
> A tier 3 target must have a designated developer or developers (the "target maintainers") on record to be CCed when issues arise regarding the target. (The mechanism to track and CC such developers may evolve over time.)
- Nicole LeGare (``@randomPoison)``
- Stephen Crane (``@rinon)``
- As a fallback trusty-dev-team@google.com can be contacted
> Targets must use naming consistent with any existing targets; for instance, a target for the same CPU or OS as an existing Rust target should use the same name for that CPU or OS. Targets should normally use the same names and naming conventions as used elsewhere in the broader ecosystem beyond Rust (such as in other toolchains), unless they have a very good reason to diverge. Changing the name of a target can be highly disruptive, especially once the target reaches a higher tier, so getting the name right is important even for a tier 3 target.
The two new Trusty targets, `aarch64-unknown-trusty` and `armv7-unknown-trusty` both follow the existing naming convention for similar targets.
> Target names should not introduce undue confusion or ambiguity unless absolutely necessary to maintain ecosystem compatibility. For example, if the name of the target makes people extremely likely to form incorrect beliefs about what it targets, the name should be changed or augmented to disambiguate it.
👍
> Tier 3 targets may have unusual requirements to build or use, but must not create legal issues or impose onerous legal terms for the Rust project or for Rust developers or users.
There are no known legal issues or license incompatibilities.
> Neither this policy nor any decisions made regarding targets shall create any binding agreement or estoppel by any party. If any member of an approving Rust team serves as one of the maintainers of a target, or has any legal or employment requirement (explicit or implicit) that might affect their decisions regarding a target, they must recuse themselves from any approval decisions regarding the target's tier status, though they may otherwise participate in discussions.
👍
> Tier 3 targets should attempt to implement as much of the standard libraries as possible and appropriate (core for most targets, alloc for targets that can support dynamic memory allocation, std for targets with an operating system or equivalent layer of system-provided functionality), but may leave some code unimplemented (either unavailable or stubbed out as appropriate), whether because the target makes it impossible to implement or challenging to implement. The authors of pull requests are not obligated to avoid calling any portions of the standard library on the basis of a tier 3 target not implementing those portions.
This PR only adds the targets for the platform. `std` support will be added once platform support is added to the libc crate, which depends on the language targets being added to rustc.
> The target must provide documentation for the Rust community explaining how to build for the target, using cross-compilation if possible. If the target supports running binaries, or running tests (even if they do not pass), the documentation must explain how to run such binaries or tests for the target, using emulation if possible or dedicated hardware if necessary.
👍
> Tier 3 targets must not impose burden on the authors of pull requests, or other developers in the community, to maintain the target. In particular, do not post comments (automated or manual) on a PR that derail or suggest a block on the PR based on a tier 3 target. Do not send automated messages or notifications (via any medium, including via ``@)`` to a PR author or others involved with a PR regarding a tier 3 target, unless they have opted into such messages.
👍
> Patches adding or updating tier 3 targets must not break any existing tier 2 or tier 1 target, and must not knowingly break another tier 3 target without approval of either the compiler team or the maintainers of the other tier 3 target.
👍
> Tier 3 targets must be able to produce assembly using at least one of rustc's supported backends from any host target. (Having support in a fork of the backend is not sufficient, it must be upstream.)
👍
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r=compiler-errors
Add unsafe to extern blocks in style guide
This goes after this is merged:
- https://github.com/rust-lang/rust/pull/127921
r? ``@traviscross``
Tracking:
- https://github.com/rust-lang/rust/issues/123743
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Implement `-Z embed-source` (DWARFv5 source code embedding extension)
Implement https://github.com/rust-lang/compiler-team/issues/764 MCP which adds an unstable flag that exposes LLVM's [DWARFv5 source code embedding](https://dwarfstd.org/issues/180201.1.html) support.
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Document WebAssembly target feature expectations
This commit is a result of the discussion on #128475 and incorporates parts of #109807 as well. This is all done as a new page of documentation for the `wasm32-unknown-unknown` target which previously did not exist. This new page goes into details about the preexisting target and additionally documents the expectations for WebAssembly features and code generation.
The tl;dr is that LLVM will enable features over time after most engines have had support for awhile. Compiling without features requires `-Ctarget-cpu=mvp` to rustc plus `-Zbuild-std` to Cargo.
Closes #109807
Closes #119811
Closes #128475
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Promote Mac Catalyst targets to Tier 2, and ship with rustup
Promote the Mac Catalyst targets `x86_64-apple-ios-macabi` and `aarch64-apple-ios-macabi` to Tier 2, as per [the MCP](https://github.com/rust-lang/compiler-team/issues/761) (see that for motivation and details).
These targets are now also distributed with rustup, although without the sanitizer runtime, as that currently has trouble building, see https://github.com/rust-lang/rust/issues/129069.
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dingxiangfei2009:allow-shadow-call-stack-sanitizer, r=tmandry
Unconditionally allow shadow call-stack sanitizer for AArch64
It is possible to do so whenever `-Z fixed-x18` is applied.
cc ``@Darksonn`` for context
The reasoning is that, as soon as reservation on `x18` is forced through the flag `fixed-x18`, on AArch64 the option to instrument with [Shadow Call Stack sanitizer](https://clang.llvm.org/docs/ShadowCallStack.html) is then applicable regardless of the target configuration.
At the every least, we would like to relax the restriction on specifically `aarch64-unknonw-none`. For this option, we can include a documentation change saying that users of compiled objects need to ensure that they are linked to runtime with Shadow Call Stack instrumentation support.
Related: #121972
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Update books
## rust-lang/book
7 commits in 67fa536768013d9d5a13f3a06790521d511ef711..04bc1396bb857f35b5dda1d773c9571e1f253304
2024-07-31 13:19:44 UTC to 2024-07-16 18:18:38 UTC
- mdbook-trpl-listing: Add missing elided lifetimes (rust-lang/book#3995)
- infra: include ghp-import and git push in generate-preview script (rust-lang/book#3998)
- infra: add robots.txt for GH Pages previews (rust-lang/book#3997)
- Clarify function definitions vs. expressions (rust-lang/book#3870)
- infra: fix some shellcheck issues in CI config (rust-lang/book#3988)
- infra: support test renderer in mdbook preprocessors (rust-lang/book#3982)
- Improve handling of `<Listing>`s (rust-lang/book#3975)
## rust-lang/edition-guide
4 commits in 5454de3d12b9ccc6375b629cf7ccda8264640aac..aeeb287d41a0332c210da122bea8e0e91844ab3e
2024-08-06 21:16:24 UTC to 2024-07-29 21:41:36 UTC
- Stabilize unsafe extern blocks (rust-lang/edition-guide#313)
- Add chapter for Lifetime Capture Rules 2024 (rust-lang/edition-guide#316)
- 2024: Add page for missing_fragment_specifier (rust-lang/edition-guide#315)
- Add documentation for 2024 prelude migration. (rust-lang/edition-guide#314)
## rust-lang/nomicon
3 commits in 0ebdacadbda8ce2cd8fbf93985e15af61a7ab895..6ecf95c5f2bfa0e6314dfe282bf775fd1405f7e9
2024-08-11 16:55:29 UTC to 2024-08-09 23:25:22 UTC
- Stabilize `min_exhaustive_patterns` (rust-lang/nomicon#445)
- repr(int) enums: both size and sign matter (rust-lang/nomicon#458)
- Update what-unsafe-does.md (rust-lang/nomicon#457)
## rust-lang/reference
6 commits in 2e191814f163ee1e77e2d6094eee4dd78a289c5b..62cd0df95061ba0ac886333f5cd7f3012f149da1
2024-08-11 21:06:12 UTC to 2024-07-30 06:34:03 UTC
- Reformat (and only reformat) the inline assembly chapter (rust-lang/reference#1550)
- Changes for unsafe extern blocks (RFC 3484) (rust-lang/reference#1536)
- Stabilize Wasm relaxed SIMD (rust-lang/reference#1421)
- Remove custom blockquote styling (rust-lang/reference#1547)
- Fix std-links for generics with commas. (rust-lang/reference#1549)
- Add details on how names are introduced. (rust-lang/reference#1052)
## rust-lang/rust-by-example
3 commits in 89aecb6951b77bc746da73df8c9f2b2ceaad494a..8f94061936e492159f4f6c09c0f917a7521893ff
2024-08-06 17:25:35 UTC to 2024-07-16 20:58:25 UTC
- Update lifetime_bounds.md (rust-lang/rust-by-example#1869)
- Remove the link to Japanese translation (rust-lang/rust-by-example#1868)
- Add an example of implementing the FromStr trait for Circles. (rust-lang/rust-by-example#1865)
## rust-lang/rustc-dev-guide
12 commits in 0c4d55cb59fe440d1a630e4e5774d043968edb3f..43d83780db545a1ed6d45773312fc578987e3968
2024-08-08 17:54:27 UTC to 2024-07-19 07:15:12 UTC
- Added 'the' in chapter "Running test" subtitle "Run unit tests on the compiler/library" (rust-lang/rustc-dev-guide#2040)
- Correct rust code block in *Dataflow Analysis* (rust-lang/rustc-dev-guide#2037)
- linkcheck: fix filtering of the source files (rust-lang/rustc-dev-guide#2019)
- chore: fix some comments (rust-lang/rustc-dev-guide#2028)
- linkcheck: fix reported broken links (part 2) (rust-lang/rustc-dev-guide#2024)
- typo (rust-lang/rustc-dev-guide#2029)
- Fix broken links in `llvm-coverage-instrumentation.md` (rust-lang/rustc-dev-guide#2027)
- Fix invalid link to toolstate documentation (rust-lang/rustc-dev-guide#2021)
- linkcheck: fix reported broken links (part 1) (rust-lang/rustc-dev-guide#2022)
- fix link (rust-lang/rustc-dev-guide#2020)
- MIR docs: fix borked links and update style (rust-lang/rustc-dev-guide#2017)
- Update adding.md (rust-lang/rustc-dev-guide#2016)
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Add possibility to generate rustdoc JSON output to stdout
Fixes #127165.
I think it's likely common to want to get rustdoc json output directly instead of reading it from a file so I added this option to allow it. It's unstable and only works with `--output-format=json`.
r? `@aDotInTheVoid`
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Add powerpc-unknown-linux-muslspe compile target
This is almost identical to already existing targets:
- powerpc_unknown_linux_musl.rs
- powerpc_unknown_linux_gnuspe.rs
It has support for PowerPC SPE (muslspe), which
can be used with GCC version up to 8. It is useful for Freescale or IBM cores like e500.
This was verified to be working with OpenWrt build system for CZ.NIC's Turris 1.x routers, which are using Freescale P2020, e500v2, so add it as a Tier 3 target.
Follow-up of https://github.com/rust-lang/rust/pull/100860
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Stabilize `asm_const`
tracking issue: https://github.com/rust-lang/rust/issues/93332
reference PR: https://github.com/rust-lang/reference/pull/1556
this will probably require some CI wrangling (and a rebase), so let's get that over with even though the final required PR is not merged yet.
r? `@ghost`
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- aarch64-apple-ios-macabi
- x86_64-apple-ios-macabi
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r=oli-obk,lqd,bjorn3,Kobzol
Link `std` statically in `rustc_driver`
This makes `rustc_driver` statically link to `std`. This is done by not passing `-C prefer-dynamic` when building `rustc_driver`. However building `rustc-main` won't work currently as it tries to dynamically link to both `rustc_driver` and `std` resulting in a crate graph with `std` duplicated. To fix that new command line option `-Z prefer_deps_of_dynamic` is added which prevents linking to a dylib if there's a static variant of it already statically linked into another dylib dependency.
The main motivation for this change is to enable `#[global_allocator]` to be used in `rustc_driver` allowing overriding the allocator used in rustc on all platforms.
---
Instead of adding `-Z prefer_deps_of_dynamic`, this PR is changed to crate opt-in to the linking change via the `rustc_private` feature instead, as that would be typically needed to link to `rustc_driver` anyway.
---
try-job: aarch64-apple
try-job: x86_64-msvc
try-job: i686-mingw
try-job: dist-x86_64-msvc
try-job: aarch64-gnu
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Promote aarch64-apple-darwin to Tier 1
This promotes aarch64-apple-darwin to Tier 1 status as per rust-lang/rfcs#3671 and tracking issue #73908. Not sure what else is necessary for this to impement the aforementioned RFC, however I figured I'd try. I did read in previous issues and PRs that the necessary infrastructure was already in place for the aarch64-apple-darwin target, and the RFC mentions the same. So this should be all thats necessary in order for the target to be promoted.
This is a recreation of my previous PR because I accidentally did an incorrect git rebase which caused unnecessary changes to various commit SHAs. So this PR is a recreation of my previous PR without said stumble. My bad.
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linker: Remove the "`--whole-archive` in test mode" backcompat hack
Fixes https://github.com/rust-lang/rust/issues/116910.
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applied
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Per rust-lang/rfcs#3671.
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This commit is a result of the discussion on #128475 and incorporates
parts of #109807 as well. This is all done as a new page of
documentation for the `wasm32-unknown-unknown` target which previously
did not exist. This new page goes into details about the preexisting
target and additionally documents the expectations for WebAssembly
features and code generation.
The tl;dr is that LLVM will enable features over time after most engines
have had support for awhile. Compiling without features requires
`-Ctarget-cpu=mvp` to rustc plus `-Zbuild-std` to Cargo.
Closes #109807
Closes #128475
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