Update to LLVM 21.1.1

[nikic]

Fixes #145988.
Fixes #146163.

[rustbot]

r? @cuviper

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They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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[rustbot]

⚠️ Warning ⚠️

• Some commits in this PR modify submodules.

  If this was not intentional, see I changed a submodule on accident in the rustc dev guide.

[dianqk]

Thanks!
@bors r+ rollup=never

[bors]

📌 Commit 092d653 has been approved by dianqk

It is now in the queue for this repository.

[nikic]

@bors p=1 Fixes P-critical and should land before beta promotion.

[bors]

⌛ Testing commit 092d653 with merge a68b5b4...

[bors]

💔 Test failed - checks-actions

[nikic]

@bors retry network error

[rust-log-analyzer]

The job tidy failed! Check out the build log: (web) (plain enhanced) (plain)

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

spellcheck files
building external tool typos from package typos-cli@1.34.0
finished building tool typos
npm WARN deprecated puppeteer@22.15.0: < 24.10.2 is no longer supported
npm ERR! code ECONNRESET
npm ERR! errno ECONNRESET
npm ERR! network Invalid response body while trying to fetch https://registry.npmjs.org/typescript: aborted
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network 
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

npm ERR! A complete log of this run can be found in: /home/user/.npm/_logs/2025-09-10T15_06_31_901Z-debug-0.log
npm install did not exit successfully
some tidy checks failed
tidy error: IO error: npm install returned exit code exit status: 1
Command `/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools-bin/rust-tidy /checkout /checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo /checkout/obj/build 4 /node/bin/npm --extra-checks=py,cpp,js,spellcheck` failed with exit code 1
Created at: src/bootstrap/src/core/build_steps/tool.rs:1550:23
Executed at: src/bootstrap/src/core/build_steps/test.rs:1281:29

Command has failed. Rerun with -v to see more details.
Bootstrap failed while executing `test src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck`
Build completed unsuccessfully in 0:02:56
  local time: Wed Sep 10 15:07:12 UTC 2025
  network time: Wed, 10 Sep 2025 15:07:12 GMT
##[error]Process completed with exit code 1.

[dianqk]

@bors retry

[bors]

⌛ Testing commit 092d653 with merge 1695eeb...

[bors]

💔 Test failed - checks-actions

[Zalathar]

@bors retry (runner flaked out again)

[bors]

⌛ Testing commit 092d653 with merge 5e33838...

[bors]

☀️ Test successful - checks-actions
Approved by: dianqk
Pushing 5e33838 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 f4665ab (parent) -> 5e33838 (this PR)

Test differences

Show 10 test diffs

Stage 2

• [assembly] tests/assembly-llvm/nvptx-safe-naming.rs#LLVM20: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 20) (J0)
• [assembly] tests/assembly-llvm/riscv-soft-abi-with-float-features.rs#LLVM-PRE-20: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 19) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 19) (J0)
• [codegen] tests/codegen-llvm/enum/enum-discriminant-eq.rs#LLVM20: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 20) (J0)
• [codegen] tests/codegen-llvm/integer-cmp.rs#llvm-pre-20: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 19) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 19) (J0)
• [assembly] tests/assembly-llvm/x86_64-cmp.rs#LLVM-PRE-20-DEBUG: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 19) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 19) (J1)
• [assembly] tests/assembly-llvm/x86_64-cmp.rs#LLVM-PRE-20-OPTIM: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 19) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 19) (J1)
• [ui] tests/ui/sanitizer/kcfi-arity-requires-llvm-21-0-0.rs: ignore (ignored when the LLVM version (21.1.0) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.1) is newer than majorversion 20) (J2)
• [run-make] tests/run-make/compressed-debuginfo-zstd: pass -> ignore (ignored if LLVM wasn't build with zstd for ELF section compression (we want LLVM/LLD to be built with zstd support)) (J3)

Additionally, 2 doctest diffs were found. These are ignored, as they are noisy.

Job group index

• J0: aarch64-apple, aarch64-gnu, aarch64-msvc-1, arm-android, armhf-gnu, dist-i586-gnu-i586-i686-musl, i686-gnu-1, i686-gnu-nopt-1, i686-msvc-1, test-various, x86_64-gnu, x86_64-gnu-nopt, x86_64-gnu-stable, x86_64-mingw-1, x86_64-msvc-1
• J1: test-various, x86_64-gnu, x86_64-gnu-nopt, x86_64-gnu-stable, x86_64-mingw-1, x86_64-msvc-1
• J2: aarch64-apple, aarch64-gnu, aarch64-msvc-1, arm-android, armhf-gnu, dist-i586-gnu-i586-i686-musl, i686-gnu-1, i686-gnu-nopt-1, i686-msvc-1, test-various, x86_64-gnu, x86_64-gnu-debug, x86_64-gnu-nopt, x86_64-gnu-stable, x86_64-mingw-1, x86_64-msvc-1
• J3: x86_64-gnu-nopt

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 5e33838ccad070f1536ed82336dd0133e2681233 --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. pr-check-1: 1487.4s -> 2040.0s (37.2%)
2. x86_64-rust-for-linux: 2757.0s -> 3661.7s (32.8%)
3. x86_64-gnu-tools: 3404.0s -> 4453.9s (30.8%)
4. dist-aarch64-linux: 8865.9s -> 6286.2s (-29.1%)
5. pr-check-2: 2298.8s -> 2799.8s (21.8%)
6. test-various: 4601.5s -> 5404.7s (17.5%)
7. armhf-gnu: 5022.3s -> 5845.5s (16.4%)
8. x86_64-gnu: 7028.7s -> 8040.7s (14.4%)
9. arm-android: 6072.5s -> 6930.0s (14.1%)
10. x86_64-gnu-nopt: 7339.0s -> 8356.7s (13.9%)

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 (5e33838): comparison URL.

Overall result: ❌✅ regressions and 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)	0.2%	[0.2%, 0.2%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	2
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 2.6%, secondary 3.2%)

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

	mean	range	count
Regressions ❌ (primary)	2.6%	[2.6%, 2.6%]	1
Regressions ❌ (secondary)	4.4%	[2.5%, 5.4%]	10
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.8%	[-3.2%, -2.4%]	2
All ❌✅ (primary)	2.6%	[2.6%, 2.6%]	1

Cycles

Results (secondary 2.2%)

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

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.2%	[0.9%, 3.1%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 468.319s -> 468.387s (0.01%)
Artifact size: 387.51 MiB -> 387.81 MiB (0.08%)

[dianqk]

landed before the beta, no nomination needed.