Turn stdarch into a Josh subtree

[Kobzol]

In a similar vein as #141229, this PR makes the stdarch repository a Josh subtree (it was previously a submodule). The initial commit of stdarch upon this is based is 5a7342fc16b208b1b16624e886937ed8509a6506, which is the previous commit SHA of the stdarch submodule. The sync was performed according to https://hackmd.io/7pOuxnkdQDaL1Y1FQr65xg.

This was decided in rust-lang/stdarch#1655.

Test pull PR on my fork: Kobzol/stdarch#1
Test push PR on my fork: Kobzol#59

I plan to use the same Rust (miri-inspired) tooling that we use for rustc-dev-guide to enable pulls/pushes on stdarch.

Note that this repository currently doesn't have any stdarch-specific tests, so before that, the subtree should only be modified through this repository only when dealing with changes that contain "cyclical dependencies" between stdarch and rustc. The long term vision is to integrate stdarch into rust-lang/rust completely.

CC @Amanieu

try-job: aarch64-apple
try-job: aarch64-gnu
try-job: x86_64-msvc-*
try-job: x86_64-gnu
try-job: x86_64-gnu-aux

[Kobzol]

Ok, removed the last commit for now.

@bors r=Amanieu

[bors]

📌 Commit e824005 has been approved by Amanieu

It is now in the queue for this repository.

[workingjubilee]

@bors p=5

[bors]

⌛ Testing commit e824005 with merge 5557683...

[rust-log-analyzer]

The job x86_64-msvc-1 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [run-make] tests\run-make\short-ice stdout ---- error: rmake recipe failed to complete status: exit code: 101 command: "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\test\\run-make\\short-ice\\rmake.exe" stdout: none --- stderr ------------------------------- thread 'main' panicked at D:\a\rust\rust\tests\run-make\short-ice\rmake.rs:38:5: assertion `left == right` failed: Full backtrace should contain the short backtrace markers. --- 2: 0x7ffc98f168f1 - std::io::IoSlice::as_slice::h48f37d8a0f0eb9fa 3: 0x7ffc98f22165 - std::sys::backtrace::lock::h338f1f7bee650f1b 4: 0x7ffc98f28170 - std::panicking::default_hook::h903e8698c1f5bdbb 5: 0x7ffc98f27e90 - std::panicking::default_hook::h903e8698c1f5bdbb 6: 0x7ffc8f9b81f0 - core[d0ced7f90386e952]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[2921d1536033a589]::Level, &str), usize), <((rustc_lint_defs[2921d1536033a589]::Level, &str), usize) as core[d0ced7f90386e952]::cmp::PartialOrd>::lt> 7: 0x7ffc98f28e87 - std::panicking::rust_panic_with_hook::h51b4fdb93e15b80b 8: 0x7ffc98f28a92 - <std::panicking::begin_panic_handler::StaticStrPayload as core::panic::PanicPayload>::take_box::hb77a26811bcf7d39 9: 0x7ffc98f22cff - std::sys::backtrace::__rust_end_short_backtrace::h23a012e374195273 10: 0x7ffc98f2861e - __rustc[40246dd6203fcbaf]::rust_begin_unwind 11: 0x7ffc9924bb91 - core::panicking::panic_fmt::hf53d3cfe82cfa659 12: 0x7ffc989c7971 - <rustc_errors[4ebb237cbff24b59]::DiagCtxtInner>::emit_diagnostic 13: 0x7ffc989c6619 - <rustc_errors[4ebb237cbff24b59]::DiagCtxtInner>::emit_diagnostic 14: 0x7ffc8fe1d0dd - RNvXsb_NtCs8HxG82G4y68_13rustc_type_ir4foldINtB5_12RegionFolderNtNtNtCsd16Cjn0VB7L_12rustc_middle2ty7context6TyCtxtNCNCNvMNtNtNtCslTcWQSQv7CF_23rustc_next_trait_solver5solve13normalizes_to12opaque_typesINtNtB20_9eval_ctxt8EvalCtxtNtNtNtCs1faUAShfB25_21rust 15: 0x7ffc989c5528 - <rustc_errors[4ebb237cbff24b59]::DiagCtxtInner>::emit_diagnostic 16: 0x7ffc989c3811 - <rustc_errors[4ebb237cbff24b59]::DiagCtxtHandle>::emit_diagnostic 17: 0x7ffc98a2578c - <rustc_span[44942cefcea815e5]::ErrorGuaranteed as rustc_errors[4ebb237cbff24b59]::diagnostic::EmissionGuarantee>::emit_producing_guarantee 18: 0x7ffc9463fdc1 - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_repeat_exprs 19: 0x7ffc94638d89 - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_repeat_exprs 20: 0x7ffc945ed420 - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::try_overloaded_call_traits 21: 0x7ffc946e0687 - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_kind 22: 0x7ffc94606edf - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_coercible_to_type 23: 0x7ffc946d4e1e - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_with_expectation 24: 0x7ffc9464730a - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_repeat_exprs 25: 0x7ffc946d6973 - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_kind 26: 0x7ffc94606edf - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_coercible_to_type 27: 0x7ffc946d4e1e - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_expr_with_expectation 28: 0x7ffc94608f6f - <rustc_hir_typeck[7389cacb8a283db0]::fn_ctxt::FnCtxt>::check_return_or_body_tail 29: 0x7ffc94577a41 - rustc_hir_typeck[7389cacb8a283db0]::check::check_fn 30: 0x7ffc944e05b2 - rustc_hir_typeck[7389cacb8a283db0]::upvar::should_do_rust_2021_incompatible_closure_captures_analysis 31: 0x7ffc96fb6595 - rustc_query_impl[61f2a928bfab0333]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[61f2a928bfab0333]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[97a080568679b98f]::query::erase::Erased<[u8; 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1 failed; 85 ignored; 0 measured; 6 filtered out; finished in 227.45s Some tests failed in compiletest suite=run-make mode=run-make host=x86_64-pc-windows-msvc target=x86_64-pc-windows-msvc Build completed unsuccessfully in 2:21:47 make: *** [Makefile:112: ci-msvc-py] Error 1 local time: Thu Jun 26 05:22:01 CUT 2025 network time: Thu, 26 Jun 2025 05:22:02 GMT ##[error]Process completed with exit code 2. Post job cleanup. [command]"C:\Program Files\Git\bin\git.exe" version 

[bors]

💔 Test failed - checks-actions

[Kobzol]

@bors retry

Seems like short-ice might be flaky on Windows?

[workingjubilee]

cc @dpaoliello

[bors]

⌛ Testing commit e824005 with merge 1e83852...

[bors]

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing 1e83852 to master...

[github-actions]

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing bc4376f (parent) -> 1e83852 (this PR)

Test differences

No test diffs found

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \ test-dashboard 1e838527f18cd24c81547ce6fbef6815032a80a7 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

1. dist-apple-various: 6063.7s -> 8379.5s (38.2%)
2. dist-aarch64-apple: 6836.1s -> 4753.0s (-30.5%)
3. dist-aarch64-linux: 7938.6s -> 5721.3s (-27.9%)
4. x86_64-apple-1: 7623.9s -> 9333.7s (22.4%)
5. x86_64-rust-for-linux: 3087.6s -> 2535.1s (-17.9%)
6. x86_64-apple-2: 5538.5s -> 4585.3s (-17.2%)
7. x86_64-gnu-aux: 7150.5s -> 5967.4s (-16.5%)
8. mingw-check-1: 1779.9s -> 1536.8s (-13.7%)
9. i686-gnu-2: 6199.3s -> 5364.5s (-13.5%)
10. dist-x86_64-apple: 10904.9s -> 9545.4s (-12.5%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

[rust-timer]

Finished benchmarking commit (1e83852): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.4%, -0.4%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 1.1%, secondary 4.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	1.1%	[1.1%, 1.1%]	1
Regressions ❌ (secondary)	4.8%	[4.8%, 4.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	1.1%	[1.1%, 1.1%]	1

Cycles

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

Binary size

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

Bootstrap: 692.088s -> 691.88s (-0.03%)
Artifact size: 372.11 MiB -> 372.13 MiB (0.00%)

[dpaoliello]

Seems like short-ice might be flaky on Windows?

There were definitely issues with x86 that I couldn't reproduce locally, so it wouldn't surprise me if x64 also occasionally has issues.

If it's a concern, then please revert the change to enable it for Windows and I can investigate later.