Add a CI job that runs a subset of UI tests with the GCC backend #146414

GuillaumeGomez · 2025-09-10T14:42:45Z

Part of rust-lang/compiler-team#891.

r? @Kobzol

Kobzol · 2025-09-10T15:36:41Z

We can also specify the doc_url of the job (

rust/src/ci/github-actions/jobs.yml

Line 345 in 5d41f7c

doc_url: https://rustc-dev-guide.rust-lang.org/tests/rust-for-linux.html

) to this: https://rustc-dev-guide.rust-lang.org/tests/codegen-backend-tests/cg_gcc.html

GuillaumeGomez · 2025-09-10T20:38:16Z

Error in ui tests:

2025-09-10T20:29:55.1757480Z -	error: couldn't load codegen backend /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/librustc_codegen_gcc-1.91.0-nightly.so: libgccjit.so.0: cannot open shared object file: No such file or directory
2025-09-10T20:29:55.1758929Z +	error: couldn't load codegen backend $BUILD_DIR/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/librustc_codegen_gcc-1.91.0-nightly.so: libgccjit.so.0: cannot open shared object file: No such file or directory

Seems like something went wrong with the build/install of libgccjit. Any idea @Kobzol? I thought libgccjit was built with bootstrap if download-ci-gcc was set to false but maybe I misunderstood something.

tgross35 · 2025-09-10T21:32:25Z

Is the .so actually in the load path? For some reason the GCC backend works differently than clif for me locally and I often find I need to manually append LD_LIBRARY_PATH, wonder if it could be something similar here.

GuillaumeGomez · 2025-09-11T14:52:11Z

Arf, it's the usual case of "it works locally for me". :-/

Gonna try to investigate if it's something wrong with paths.

GuillaumeGomez · 2025-09-11T15:32:40Z

Seems like we don't copy the .so files when we build gcc unlike when we download it.

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? `@GuillaumeGomez`

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? ``@GuillaumeGomez``

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? ```@GuillaumeGomez```

Rollup merge of #146449 - Kobzol:gcc-fix-symlink, r=GuillaumeGomez Fix `libgccjit` symlink when we build GCC locally Unblocks #146414. r? ```@GuillaumeGomez```

Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang/rust#146414. r? ```@GuillaumeGomez```

GuillaumeGomez · 2025-10-13T19:26:17Z

So I didn't think of testing without the GCC backend. ^^'

rust-bors · 2025-10-13T21:23:55Z

☀️ Try build successful (CI)
Build commit: 19c765a (19c765a48d5ae3d58ecdca5b3b0e078e980ced2e, parent: ed1d94311e7ed53eabb5667ef577802d88d1aaee)

GuillaumeGomez · 2025-10-13T21:25:39Z

Let's try again. :')

@bors r=Kobzol p=6

bors · 2025-10-13T21:25:41Z

📌 Commit 9d15d66 has been approved by Kobzol

It is now in the queue for this repository.

…obzol Add a CI job that runs a subset of UI tests with the GCC backend Part of rust-lang/compiler-team#891. r? `@Kobzol`

bors · 2025-10-13T22:26:41Z

⌛ Testing commit 9d15d66 with merge 3b4f330...

bors · 2025-10-14T00:20:55Z

💔 Test failed - checks-actions

GuillaumeGomez · 2025-10-14T08:55:53Z

Hum weird. I can't access the logs. Oh well.

@bors retry

bors · 2025-10-14T09:21:28Z

⌛ Testing commit 9d15d66 with merge 2f7620a...

bors · 2025-10-14T12:31:51Z

☀️ Test successful - checks-actions
Approved by: Kobzol
Pushing 2f7620a to master...

github-actions · 2025-10-14T12:35:02Z

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 fb24b04 (parent) -> 2f7620a (this PR)

Test differences

Show 2 test diffs

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

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 2f7620a5ccfea7d59d1f500e2a2e59cf1c867a1b --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

aarch64-apple: 13328.0s -> 8761.6s (-34.3%)
dist-aarch64-linux: 8676.9s -> 6288.1s (-27.5%)
x86_64-rust-for-linux: 3142.5s -> 2657.1s (-15.4%)
aarch64-gnu-debug: 4477.2s -> 3854.3s (-13.9%)
aarch64-gnu-llvm-20-1: 3666.5s -> 3196.9s (-12.8%)
aarch64-gnu-llvm-20-2: 2411.6s -> 2122.3s (-12.0%)
dist-aarch64-apple: 7848.9s -> 7065.3s (-10.0%)
dist-x86_64-musl: 8299.2s -> 7502.6s (-9.6%)
dist-loongarch64-linux: 5195.3s -> 5635.7s (8.5%)
arm-android: 6158.9s -> 5657.5s (-8.1%)

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 · 2025-10-14T13:42:54Z

Finished benchmarking commit (2f7620a): 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)

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

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: 474.864s -> 475.635s (0.16%)
Artifact size: 388.45 MiB -> 388.48 MiB (0.01%)

Ignore more failing ui tests for GCC backend Needed for rust-lang/rust#146414. r? ``@Kobzol``

Initialize llvm submodule if not already the case to run citool While working on rust-lang/rust#146414, I ran the following command (to run CI docker locally): ``` cargo run --manifest-path src/ci/citool/Cargo.toml run-local --type pr x86_64-gnu-gcc ``` However, since I didn't have `src/llvm` submodule initialized, it failed. Apparently it's a common issue for people using this tool so this PR removes this small inconvenience. r? ``@Kobzol``

rustbot assigned Kobzol Sep 10, 2025

GuillaumeGomez changed the title ~~Run rust tests with GCC backend~~ Run tests with GCC backend Sep 10, 2025

GuillaumeGomez mentioned this pull request Sep 10, 2025

Add missing documentation for running tests with GCC backend rust-lang/rustc-dev-guide#2587

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GuillaumeGomez force-pushed the run-test-with-gcc-backend branch from 3a3bcf7 to 0efa10e Compare September 10, 2025 19:32

Kobzol mentioned this pull request Sep 11, 2025

Fix libgccjit symlink when we build GCC locally #146449

Merged

Zalathar added a commit to Zalathar/rust that referenced this pull request Sep 12, 2025

Rollup merge of rust-lang#146449 - Kobzol:gcc-fix-symlink, r=Guillaum…

bfc33ef

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? `@GuillaumeGomez`

Zalathar added a commit to Zalathar/rust that referenced this pull request Sep 12, 2025

Rollup merge of rust-lang#146449 - Kobzol:gcc-fix-symlink, r=Guillaum…

9ff3ffc

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? ``@GuillaumeGomez``

Zalathar added a commit to Zalathar/rust that referenced this pull request Sep 12, 2025

Rollup merge of rust-lang#146449 - Kobzol:gcc-fix-symlink, r=Guillaum…

accb4a3

…eGomez Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang#146414. r? ```@GuillaumeGomez```

rust-timer added a commit that referenced this pull request Sep 12, 2025

Unrolled build for #146449

e5ef98e

Rollup merge of #146449 - Kobzol:gcc-fix-symlink, r=GuillaumeGomez Fix `libgccjit` symlink when we build GCC locally Unblocks #146414. r? ```@GuillaumeGomez```

GuillaumeGomez force-pushed the run-test-with-gcc-backend branch from 0efa10e to 7d861fe Compare September 12, 2025 16:01

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github-actions bot pushed a commit to rust-lang/miri that referenced this pull request Sep 13, 2025

Rollup merge of #146449 - Kobzol:gcc-fix-symlink, r=GuillaumeGomez

cb548d7

Fix `libgccjit` symlink when we build GCC locally Unblocks rust-lang/rust#146414. r? ```@GuillaumeGomez```

GuillaumeGomez mentioned this pull request Sep 16, 2025

Do not run ui test if options specific to LLVM are used when another codegen backend is used #146618

Merged

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 Oct 13, 2025

bors added a commit that referenced this pull request Oct 13, 2025

Auto merge of #146414 - GuillaumeGomez:run-test-with-gcc-backend, r=K…

3b4f330

…obzol Add a CI job that runs a subset of UI tests with the GCC backend Part of rust-lang/compiler-team#891. r? `@Kobzol`

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 14, 2025

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 Oct 14, 2025

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 14, 2025

bors merged commit 2f7620a into rust-lang:master Oct 14, 2025
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rustbot added this to the 1.92.0 milestone Oct 14, 2025

GuillaumeGomez deleted the run-test-with-gcc-backend branch October 14, 2025 12:32

bors mentioned this pull request Oct 14, 2025

Stabilize stack-protector #146369

Open

flip1995 pushed a commit to flip1995/rust-clippy that referenced this pull request Oct 18, 2025

Rollup merge of #147058 - GuillaumeGomez:ignore-more-ui-tests, r=Kobzol

f9138d1

Ignore more failing ui tests for GCC backend Needed for rust-lang/rust#146414. r? ``@Kobzol``

antoyo mentioned this pull request Oct 22, 2025

Refactor the way cg_ssa handles indirect returns(returns via sret). #144976

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ojeda mentioned this pull request Oct 22, 2025

Rust CI wanted features & bugfixes Rust-for-Linux/linux#1080

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Overall result: no relevant changes - no action needed

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