Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins` #146133

rcvalle · 2025-09-02T18:25:52Z

This reverts commit cf8753e (PR #145368) and fix the regressions reported at #145981, #146109, and #146145.

rustbot · 2025-09-02T18:25:56Z

rustbot has assigned @davidtwco.
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rustbot · 2025-09-02T18:26:00Z

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

rcvalle · 2025-09-02T18:26:10Z

r? @bjorn3

bjorn3 · 2025-09-02T19:48:07Z

Can you please remove the issue references from the commit message. r=me with the commit message changed.

…r_builtins`" This reverts commit cf8753e and fixes the regressions reported.

rcvalle · 2025-09-03T06:21:04Z

r? @bjorn3

rustbot · 2025-09-03T06:21:07Z

Requested reviewer is already assigned to this pull request.

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nikic · 2025-09-03T07:58:17Z

@bors r=bjorn3 rollup

bors · 2025-09-03T07:58:21Z

📌 Commit 916b55e has been approved by bjorn3

It is now in the queue for this repository.

nikic · 2025-09-03T07:58:55Z

@bors p=1 (multiple reported regressions)

Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins` This reverts commit cf8753e and fix the regressions reported at rust-lang#145981 and rust-lang#146109.

Rollup of 15 pull requests Successful merges: - #143725 (core: add Peekable::next_if_map) - #145209 (Stabilize `path_add_extension`) - #145750 (raw_vec.rs: Remove superfluous fn alloc_guard) - #145962 (Ensure we emit an allocator shim when only some crate types need one) - #145963 (Add LSX accelerated implementation for source file analysis) - #146054 (add `#[must_use]` to `array::repeat`) - #146090 (Derive `PartialEq` for `InvisibleOrigin`) - #146120 (Correct typo in `rustc_errors` comment) - #146127 (Rename `ToolRustc` to `ToolRustcPrivate`) - #146131 (rustdoc-search: add test case for indexing every item type) - #146133 (Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins`) - #146134 (llvm: nvptx: Layout update to match LLVM) - #146136 (docs(std): add missing closing code block fences in doc comments) - #146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments) - #146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries) r? `@ghost` `@rustbot` modify labels: rollup

RalfJung · 2025-09-03T12:11:38Z

Please also reference the PR when filing a revert, so there's a backlink in the original PR and one can see the revert there. (I did that now for this PR.)

Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins` This reverts commit cf8753e (PR rust-lang#145368) and fix the regressions reported at rust-lang#145981 and rust-lang#146109.

Rollup of 16 pull requests Successful merges: - #143725 (core: add Peekable::next_if_map) - #145209 (Stabilize `path_add_extension`) - #145342 (fix drop scope for `super let` bindings within `if let`) - #145750 (raw_vec.rs: Remove superfluous fn alloc_guard) - #145962 (Ensure we emit an allocator shim when only some crate types need one) - #145963 (Add LSX accelerated implementation for source file analysis) - #146054 (add `#[must_use]` to `array::repeat`) - #146090 (Derive `PartialEq` for `InvisibleOrigin`) - #146120 (Correct typo in `rustc_errors` comment) - #146127 (Rename `ToolRustc` to `ToolRustcPrivate`) - #146133 (Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins`) - #146134 (llvm: nvptx: Layout update to match LLVM) - #146136 (docs(std): add missing closing code block fences in doc comments) - #146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments) - #146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries) - #146156 (miri subtree update) r? `@ghost` `@rustbot` modify labels: rollup

bors · 2025-09-03T19:07:58Z

⌛ Testing commit 916b55e with merge a1208bf...

bors · 2025-09-03T22:15:51Z

☀️ Test successful - checks-actions
Approved by: bjorn3
Pushing a1208bf to master...

github-actions · 2025-09-03T22:19:07Z

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 fd75a9c (parent) -> a1208bf (this PR)

Test differences

Show 6 test diffs

Stage 1

[ui] tests/ui/sanitizer/cfi/no_builtins.rs: pass -> [missing] (J1)

Stage 2

[ui] tests/ui/sanitizer/cfi/no_builtins.rs: pass -> [missing] (J0)
[ui] tests/ui/sanitizer/cfi/no_builtins.rs: ignore (ignored on targets without CFI sanitizer) -> [missing] (J2)

Additionally, 3 doctest diffs were found. These are ignored, as they are noisy.

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard a1208bf765ba783ee4ebdc4c29ab0a0c215806ef --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

dist-apple-various: 4386.1s -> 3149.7s (-28.2%)
dist-arm-linux-musl: 6060.9s -> 5568.7s (-8.1%)
dist-various-1: 4238.7s -> 3924.3s (-7.4%)
dist-x86_64-netbsd: 5095.5s -> 4723.3s (-7.3%)
dist-aarch64-msvc: 5654.9s -> 6032.1s (6.7%)
dist-various-2: 2321.0s -> 2171.9s (-6.4%)
dist-android: 1591.1s -> 1497.0s (-5.9%)
pr-check-2: 2179.8s -> 2306.7s (5.8%)
tidy: 191.7s -> 181.8s (-5.1%)
dist-aarch64-apple: 7391.3s -> 7762.7s (5.0%)

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 · 2025-09-03T23:26:20Z

Finished benchmarking commit (a1208bf): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

Max RSS (memory usage)

Results (primary 10.6%, secondary -1.4%)

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

	mean	range	count
Regressions ❌ (primary)	10.6%	[9.6%, 11.7%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.4%	[-1.4%, -1.4%]	1
All ❌✅ (primary)	10.6%	[9.6%, 11.7%]	2

Cycles

Results (primary 2.5%)

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

	mean	range	count
Regressions ❌ (primary)	2.5%	[2.5%, 2.5%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.5%	[2.5%, 2.5%]	1

Binary size

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

Bootstrap: 466.494s -> 466.26s (-0.05%)
Artifact size: 388.33 MiB -> 388.41 MiB (0.02%)

rustbot assigned davidtwco Sep 2, 2025

rustbot added PG-exploit-mitigations Project group: Exploit mitigations 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. labels Sep 2, 2025

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rustbot assigned bjorn3 and unassigned davidtwco Sep 2, 2025

rcvalle force-pushed the rust-cfi-fix-145981 branch from df97f0f to 0bc9d00 Compare September 2, 2025 18:27

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tgross35 changed the title ~~Revert "Make lto and linker-plugin-lto work the same for `compile…~~ Revert "Make lto and linker-plugin-lto work the same for compiler_builtins Sep 2, 2025

Revert "Make lto and linker-plugin-lto work the same for `compile…

916b55e

…r_builtins`" This reverts commit cf8753e and fixes the regressions reported.

rcvalle force-pushed the rust-cfi-fix-145981 branch from 0bc9d00 to 916b55e Compare September 2, 2025 20:11

rcvalle marked this pull request as draft September 2, 2025 22:27

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 2, 2025

rcvalle marked this pull request as ready for review September 3, 2025 06:20

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Sep 3, 2025

lqd mentioned this pull request Sep 3, 2025

staticlib with lto=fat now includes compiler_builtins as llvm bitcode after rustup update #146145

Closed

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 3, 2025

jhpratt mentioned this pull request Sep 3, 2025

Rollup of 15 pull requests #146153

Closed

RalfJung mentioned this pull request Sep 3, 2025

rustc-LLVM ERROR of ControlFlowIntegrit #142284

Open

Zalathar mentioned this pull request Sep 3, 2025

Rollup of 16 pull requests #146158

Closed

bors added the merged-by-bors This PR was explicitly merged by bors. label Sep 3, 2025

bors merged commit a1208bf into rust-lang:master Sep 3, 2025
11 checks passed

rustbot added this to the 1.91.0 milestone Sep 3, 2025

rcvalle deleted the rust-cfi-fix-145981 branch September 4, 2025 21:12

This was referenced Sep 4, 2025

regression with LTO + musl + build-std #146109

Closed

Cross linker lto error: conflict llvm version. #145981

Closed

Sanitizers target modificators #138736

Merged

ctz mentioned this pull request Sep 5, 2025

Introduce ApiMisuse error rustls/rustls#2620

Open

Revert "Make lto and linker-plugin-lto work the same for compiler_builtins #146133

Revert "Make lto and linker-plugin-lto work the same for compiler_builtins #146133

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Test differences

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Job duration changes

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rust-timer commented Sep 3, 2025

Overall result: no relevant changes - no action needed

Instruction count

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Cycles

Binary size

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Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins` #146133

Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins` #146133

rcvalle commented Sep 2, 2025 •

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