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Add optional CI job to build the compiler with the parallel frontend - #153726

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Add optional CI job to build the compiler with the parallel frontend#153726
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Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).

r? @jieyouxu

@rustbotrustbot added A-CI Area: Our Github Actions CI A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels Mar 11, 2026
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@bors try jobs=x86_64-gnu-parallel-frontend

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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
try-job: x86_64-gnu-parallel-frontend
@KobzolKobzol changed the title Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)
Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)

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General idea seems good, some clarifications
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Comment threadsrc/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile Outdated
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Kobzolforce-pushed the parallel-frontend-tests-optional branch from 3a48d69 to 5ac0eedCompareMarch 12, 2026 08:08
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Updated docs and adopted the optional- naming convention.

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Thanks, r=me with one doc nit (I forgot to mention)

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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.

cc @BoxyUwU, @tshepang

@rustbotrustbot added the A-rustc-dev-guide Area: rustc-dev-guide label Mar 12, 2026
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@bors r=jieyouxu

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📌 Commit b3333b3 has been approved by jieyouxu

It is now in the queue for this repository.

@rust-borsrust-borsBot 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 Mar 12, 2026
Zalathar added a commit to Zalathar/rust that referenced this pull request Mar 12, 2026
@Zalathar
Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
@ZalatharZalathar mentioned this pull request Mar 12, 2026
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rust-borsBot pushed a commit that referenced this pull request Mar 12, 2026
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
c204208
Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...

Workflow: https://github.com/rust-lang/rust/actions/runs/22999418572

rust-borsBot pushed a commit that referenced this pull request Mar 12, 2026
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
dc9c2eb
…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
@JonathanBrouwerJonathanBrouwer mentioned this pull request Mar 12, 2026
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
@ZalatharZalathar mentioned this pull request Mar 12, 2026
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Auto build was cancelled. Cancelled workflows:

The next pull request likely to be tested is #153770.

rust-borsBot pushed a commit that referenced this pull request Mar 12, 2026
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
…uwer
Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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@bors yield (enclosing rollup)

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❗ There is currently no auto build in progress on this PR.

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if we see that this new job works well

Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.

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rust-borsBot merged commit 305778c into rust-lang:mainMar 12, 2026
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@rustbotrustbot added this to the 1.96.0 milestone Mar 12, 2026
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Kobzol deleted the parallel-frontend-tests-optional branch March 12, 2026 15:31
github-actionsBot pushed a commit to rust-lang/rustc-dev-guide that referenced this pull request Mar 16, 2026
@bors
Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
…uwer
Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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@Kobzol
If the optional job fails on some PR, how do we know about it? E.g. to open an issue.

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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.

@jieyouxujieyouxu mentioned this pull request May 28, 2026
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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@bors try jobs=x86_64-gnu-parallel-frontend
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
try-job: x86_64-gnu-parallel-frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Comment threadsrc/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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📌 Commit b3333b3 has been approved by jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
c204208
Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
Workflow: https://github.com/rust-lang/rust/actions/runs/22999418572
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
dc9c2eb
…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
The next pull request likely to be tested is #153770.
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
…uwer
Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
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Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
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@bors try jobs=x86_64-gnu-parallel-frontend
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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📌 Commit b3333b3 has been approved by jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
c204208
Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
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Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
The next pull request likely to be tested is #153770.
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
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Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
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Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
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@bors try jobs=x86_64-gnu-parallel-frontend
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Add optional CI job to run tests with the parallel frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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📌 Commit b3333b3 has been approved by jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
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Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
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Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
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Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
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Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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@bors try jobs=x86_64-gnu-parallel-frontend
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
try-job: x86_64-gnu-parallel-frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Comment threadsrc/ci/citool/src/jobs.rs
Comment threadsrc/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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📌 Commit b3333b3 has been approved by jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
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Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
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…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
The next pull request likely to be tested is #153770.
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
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Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
…uwer
Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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, 'i');
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Kobzol:parallel-frontend-tests-optional
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Add optional CI job to build the compiler with the parallel frontend#153726
rust-bors[bot] merged 3 commits into
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Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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@bors try jobs=x86_64-gnu-parallel-frontend
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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General idea seems good, some clarifications
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
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Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
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…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
…uwer
Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
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Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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@bors try jobs=x86_64-gnu-parallel-frontend
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Add optional CI job to run tests with the parallel frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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📌 Commit b3333b3 has been approved by jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
c204208
Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
Workflow: https://github.com/rust-lang/rust/actions/runs/22999418572
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
dc9c2eb
…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
The next pull request likely to be tested is #153770.
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
…uwer
Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
…uwer
Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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Add optional CI job to build the compiler with the parallel frontend by Kobzol · Pull Request #153726 · rust-lang/rust · GitHub
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Add optional CI job to build the compiler with the parallel frontend - #153726
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Kobzol:parallel-frontend-tests-optional
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Add optional CI job to build the compiler with the parallel frontend#153726
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Discussed on Zulip.
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
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@bors try jobs=x86_64-gnu-parallel-frontend
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=<try>
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Add optional CI job to run tests with the parallel frontend
try-job: x86_64-gnu-parallel-frontend
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Add optional CI job to run tests with the parallel frontendAdd optional CI job to build the compiler with the parallel frontendMar 11, 2026
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☀️ Try build successful (CI)

Build commit: 84afa72 (84afa72e5bb52b18560d0f7a0c1668d6842acaa1, parent: 3b1b0ef4d80d3117924d91352c8b6ca528708b3c)
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General idea seems good, some clarifications
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Comment threadsrc/ci/citool/src/jobs.rs
Comment threadsrc/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile
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Updated docs and adopted the optional- naming convention.
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Thanks, r=me with one doc nit (I forgot to mention)
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Comment threadsrc/ci/citool/src/jobs.rs
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The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.
cc @BoxyUwU, @tshepang
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@bors r=jieyouxu
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📌 Commit b3333b3 has been approved by jieyouxu
It is now in the queue for this repository.
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
70c06b3
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto merge of#153767- Zalathar:rollup-iwWBIxC, r=Zalathar
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Rollup of 11 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153708 (de-non_const `Iterator` trait methods)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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⌛ Testing commit b3333b3 with merge dc9c2eb...
Workflow: https://github.com/rust-lang/rust/actions/runs/22999418572
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Auto merge of#153726- Kobzol:parallel-frontend-tests-optional, r=ji…
dc9c2eb
…eyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Rollup merge ofrust-lang#153726- Kobzol:parallel-frontend-tests-opt…
4003c4d
…ional, r=jieyouxu
Add optional CI job to build the compiler with the parallel frontend
Discussed on [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fparallel-rustc/topic/Add.20the.20parallel.20front-end.20test.20suite/with/578684794).
Note: this only builds the compiler, stdlib, etc. with 2 threads. UI tests are still compiled serially. I'd add that in a follow-up PR if we see that this new job works well (and if optional auto jobs work well in the first place).
r? @jieyouxu
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Auto build was cancelled. Cancelled workflows:
The next pull request likely to be tested is #153770.
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Auto merge of#153770- JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
d097a0c
…uwer
Rollup of 10 pull requests
Successful merges:
- #153726 (Add optional CI job to build the compiler with the parallel frontend)
- #153763 (Don't add empty target features for target-cpu=native on macOS)
- #153432 (Fix some comments about dataflow analysis.)
- #153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- #153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- #153717 (unused_macro_rules switched used and unused comments)
- #153736 (add test that an incomplete feature emits a warning)
- #153748 (editorconfig: css uses tabs)
- #153750 (rustc-dev-guide subtree update)
- #153762 (actually make the is-fn test test what it says it tests)
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❗ There is currently no auto build in progress on this PR.
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if we see that this new job works well
Not sure about the CI environment, but locally I've been working on rustc with RUSTFLAGS="-Zthreads=8" enabled for a couple of years (?) already and have only seen incremental issues (or temporary regressions like #152717), so I'm optimistic.
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Auto merge of #153770 - JonathanBrouwer:rollup-522Yrag, r=JonathanBro…
a57fc3a
…uwer
Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#153726 (Add optional CI job to build the compiler with the parallel frontend)
- rust-lang/rust#153763 (Don't add empty target features for target-cpu=native on macOS)
- rust-lang/rust#153432 (Fix some comments about dataflow analysis.)
- rust-lang/rust#153529 (Fix LegacyKeyValueFormat report from docker build: pr)
- rust-lang/rust#153694 (fix(query): Pass Query Key to `value_from_cycle_error`)
- rust-lang/rust#153717 (unused_macro_rules switched used and unused comments)
- rust-lang/rust#153736 (add test that an incomplete feature emits a warning)
- rust-lang/rust#153748 (editorconfig: css uses tabs)
- rust-lang/rust#153750 (rustc-dev-guide subtree update)
- rust-lang/rust#153762 (actually make the is-fn test test what it says it tests)
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If the optional job fails on some PR, how do we know about it? E.g. to open an issue.
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I'm not sure, to be honest. I guess we'd have to try to fail it forcefully to see what happens. We have scripts that could find out if it failed e.g. in the past week, but that's a bit unsystematic. I guess this can also be used - right now the failure rate seems to be zero.
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