compiler: Ease off the accelerator on `unsupported_calling_conventions` #142353

workingjubilee · 2025-06-11T09:04:59Z

This is to give us more time to discuss #142330 without the ecosystem having an anxiety attack. I have withdrawn unsupported_calling_conventions from report-in-deps

I believe we should consider this a simple suspension of the decision in #141435 to start this process, rather than a reversal. That is, we may continue with linting again. But I believe we are about to get a... reasonable amount of feedback just from currently available information and should allow ourselves time to process it.

rustbot · 2025-06-11T09:05:03Z

r? @fee1-dead

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rustbot · 2025-06-11T09:05:06Z

These commits modify compiler targets.
(See the Target Tier Policy.)

workingjubilee · 2025-06-11T09:06:37Z

cc @RalfJung

workingjubilee · 2025-06-11T09:15:56Z

oh I should bless tests, sec...

RalfJung · 2025-06-11T09:52:05Z

compiler/rustc_target/src/spec/abi_map.rs

@@ -95,8 +95,7 @@ impl AbiMap {
                return AbiMapping::Invalid;
            }

-            (ExternAbi::Cdecl { .. }, Arch::X86) => CanonAbi::C,
-            (ExternAbi::Cdecl { .. }, _) => return AbiMapping::Deprecated(CanonAbi::C),


I think this should remain deprecated. Just disabling report_in_deps is enough IMO.

RalfJung · 2025-06-11T17:24:04Z

Thanks! r=me when CI is green.

workingjubilee · 2025-06-11T18:22:00Z

@bors r=RalfJung

bors · 2025-06-11T18:22:03Z

📌 Commit 8f0c09a has been approved by RalfJung

It is now in the queue for this repository.

…cl-and-other-abis, r=RalfJung compiler: Ease off the accelerator on `unsupported_calling_conventions` This is to give us more time to discuss rust-lang#142330 without the ecosystem having an anxiety attack. I have withdrawn `unsupported_calling_conventions` from report-in-deps I believe we should consider this a simple suspension of the decision in rust-lang#141435 to start this process, rather than a reversal. That is, we may continue with linting again. But I believe we are about to get a... reasonable amount of feedback just from currently available information and should allow ourselves time to process it.

Rollup of 9 pull requests Successful merges: - #138016 (Added `Clone` implementation for `ChunkBy`) - #140770 (add `extern "custom"` functions) - #141162 (refactor `AttributeGate` and `rustc_attr!` to emit notes during feature checking) - #141474 (Add `ParseMode::Diagnostic` and fix multiline spans in diagnostic attribute lints) - #141947 (Specify that "option-like" enums must be `#[repr(Rust)]` to be ABI-compatible with their non-1ZST field.) - #142135 (docs: autogenerate compiler flag stubs based on -Zhelp) - #142252 (Improve clarity of `core::sync::atomic` docs about "Considerations" in regards to CAS operations) - #142337 (miri: add flag to suppress float non-determinism) - #142353 (compiler: Ease off the accelerator on `unsupported_calling_conventions`) r? `@ghost` `@rustbot` modify labels: rollup

…cl-and-other-abis, r=RalfJung compiler: Ease off the accelerator on `unsupported_calling_conventions` This is to give us more time to discuss rust-lang#142330 without the ecosystem having an anxiety attack. I have withdrawn `unsupported_calling_conventions` from report-in-deps I believe we should consider this a simple suspension of the decision in rust-lang#141435 to start this process, rather than a reversal. That is, we may continue with linting again. But I believe we are about to get a... reasonable amount of feedback just from currently available information and should allow ourselves time to process it.

RalfJung · 2025-06-12T13:18:07Z

@bors p=1
since people are now seeing these warnings on their nightly builds and the playground

workingjubilee · 2025-06-12T18:55:51Z

see #142433

ChrisDenton · 2025-06-12T23:07:27Z

It looks like there is a genuine tidy error:

/checkout/tests/ui/linkage-attr/raw-dylib/windows/unsupported-abi.rs: revision [unspecified] should specify `needs-llvm-components:` as it has `--target` set

@bors r-

ChrisDenton · 2025-06-12T23:26:37Z

I just applied the tidy suggestion and blessed. No other changes. We missed today's nightly but I really do want this to make the next one if it's at all possible.

@bors r=ChrisDenton,RalfJung p=2

bors · 2025-06-12T23:26:40Z

📌 Commit 9f50246 has been approved by ChrisDenton,RalfJung

It is now in the queue for this repository.

workingjubilee · 2025-06-13T00:22:29Z

ah shit, I always forget the llvm components thing

bors · 2025-06-13T02:06:07Z

⌛ Testing commit 9f50246 with merge ed44c0e...

bors · 2025-06-13T05:08:02Z

☀️ Test successful - checks-actions
Approved by: ChrisDenton,RalfJung
Pushing ed44c0e to master...

github-actions · 2025-06-13T05:11:12Z

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 bb3a3c5 (parent) -> ed44c0e (this PR)

Test differences

Show 3 test diffs

Stage 1

[ui] tests/ui/linkage-attr/raw-dylib/windows/unsupported-abi.rs: ignore (only executed when the operating system is windows) -> pass (J2)

Stage 2

[ui] tests/ui/linkage-attr/raw-dylib/windows/unsupported-abi.rs: ignore (only executed when the operating system is windows) -> pass (J0)
[ui] tests/ui/linkage-attr/raw-dylib/windows/unsupported-abi.rs: ignore (only executed when the architecture is x86_64) -> pass (J1)

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard ed44c0e3b3a4f90c464361ec6892c1d42c15ea8f --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

x86_64-apple-2: 3906.0s -> 4793.3s (22.7%)
dist-aarch64-apple: 5101.4s -> 6038.3s (18.4%)
dist-apple-various: 5999.0s -> 6953.1s (15.9%)
i686-gnu-2: 5382.7s -> 6191.7s (15.0%)
i686-gnu-nopt-1: 6956.3s -> 8001.6s (15.0%)
x86_64-apple-1: 7365.6s -> 6424.0s (-12.8%)
dist-x86_64-apple: 9724.6s -> 8564.2s (-11.9%)
x86_64-gnu-debug: 5206.0s -> 5806.5s (11.5%)
i686-gnu-1: 7181.9s -> 8002.1s (11.4%)
armhf-gnu: 4471.3s -> 4979.7s (11.4%)

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 · 2025-06-13T07:41:17Z

Finished benchmarking commit (ed44c0e): 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 (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)	-	-	0
Regressions ❌ (secondary)	8.5%	[8.5%, 8.5%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-5.6%	[-5.6%, -5.6%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (primary 2.7%, secondary -2.3%)

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

	mean	range	count
Regressions ❌ (primary)	2.7%	[2.0%, 3.6%]	8
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	2.7%	[2.0%, 3.6%]	8

Binary size

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

Bootstrap: 755.435s -> 756.165s (0.10%)
Artifact size: 372.24 MiB -> 372.25 MiB (0.00%)

rustbot assigned fee1-dead Jun 11, 2025

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. labels Jun 11, 2025

workingjubilee mentioned this pull request Jun 11, 2025

windows-sys v0.59.0 (latest version) hits a FCW on the latest nightly #142330

Closed

RalfJung reviewed Jun 11, 2025

View reviewed changes

workingjubilee added 2 commits June 11, 2025 09:55

compiler: Avoid reporting unsupported_calling_conventions in deps

86493f7

tests: Bless for weaker unsupported_calling_conventions

8f0c09a

workingjubilee force-pushed the warn-less-about-cdecl-and-other-abis branch from 8c797db to 8f0c09a Compare June 11, 2025 16:58

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 Jun 11, 2025

workingjubilee mentioned this pull request Jun 12, 2025

Rollup of 15 pull requests #142396

Closed

workingjubilee mentioned this pull request Jun 12, 2025

Rollup of 15 pull requests #142397

Closed

fee1-dead assigned RalfJung and unassigned fee1-dead Jun 12, 2025

matthiaskrgr mentioned this pull request Jun 12, 2025

Rollup of 9 pull requests #142399

Closed

matthiaskrgr mentioned this pull request Jun 12, 2025

Rollup of 8 pull requests #142409

Closed

RalfJung mentioned this pull request Jun 12, 2025

Use extern "C" instead of extern "cdecl" microsoft/windows-rs#3622

Merged

workingjubilee closed this Jun 12, 2025

workingjubilee reopened this Jun 12, 2025

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workingjubilee added the CI-spurious-fail-npm we forgot to cache our installs from npm label Jun 12, 2025

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bors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jun 12, 2025

ChrisDenton force-pushed the warn-less-about-cdecl-and-other-abis branch from 5636649 to 5fdca31 Compare June 12, 2025 23:12

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ChrisDenton force-pushed the warn-less-about-cdecl-and-other-abis branch from 5fdca31 to 97c3860 Compare June 12, 2025 23:17

tests: Convert linkage-attr test to cross-compiling and bless

9f50246

ChrisDenton force-pushed the warn-less-about-cdecl-and-other-abis branch from 97c3860 to 9f50246 Compare June 12, 2025 23:22

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 12, 2025

bors added the merged-by-bors This PR was explicitly merged by bors. label Jun 13, 2025

bors merged commit ed44c0e into rust-lang:master Jun 13, 2025
11 checks passed

rustbot added this to the 1.89.0 milestone Jun 13, 2025

bors mentioned this pull request Jun 13, 2025

Reject unsupported extern "{abi}"s consistently in all positions #142134

Open

workingjubilee deleted the warn-less-about-cdecl-and-other-abis branch June 14, 2025 01:08

compiler: Ease off the accelerator on unsupported_calling_conventions #142353

compiler: Ease off the accelerator on unsupported_calling_conventions #142353

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github-actions bot commented Jun 13, 2025

Test differences

Stage 1

Stage 2

Job duration changes

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rust-timer commented Jun 13, 2025

Overall result: no relevant changes - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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compiler: Ease off the accelerator on `unsupported_calling_conventions` #142353

compiler: Ease off the accelerator on `unsupported_calling_conventions` #142353

workingjubilee commented Jun 11, 2025 •

edited

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