Add test for parallel compiler reproducible build

[aerooneqq]

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Adds a test for reproducible binaries when using parallel compiler.

Confirmed with bisection and manual testing that #144722 fixed #140413, added test fails before commit (075ce31) from #144722.

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Regression in nightly-2025-08-14
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fetching https://static.rust-lang.org/dist/2025-08-13/channel-rust-nightly-git-commit-hash.txt
nightly manifest 2025-08-13: 40 B / 40 B [============================================================================================================================================================================] 100.00 % 357.18 KB/s converted 2025-08-13 to 8e62bfd311791bfd9dca886abdfbab07ec54d8b4
fetching https://static.rust-lang.org/dist/2025-08-14/channel-rust-nightly-git-commit-hash.txt
nightly manifest 2025-08-14: 40 B / 40 B [============================================================================================================================================================================] 100.00 % 123.86 KB/s converted 2025-08-14 to 3672a55b7cfd0a12e7097197b6242872473ffaa7
looking for regression commit between 2025-08-13 and 2025-08-14
fetching (via remote github) commits from max(8e62bfd311791bfd9dca886abdfbab07ec54d8b4, 2025-08-11) to 3672a55b7cfd0a12e7097197b6242872473ffaa7
ending github query because we found starting sha: 8e62bfd311791bfd9dca886abdfbab07ec54d8b4
get_commits_between returning commits, len: 7
  commit[0] 2025-08-12: Auto merge of #144678 - jdonszelmann:no-mangle-extern, r=bjorn3
  commit[1] 2025-08-12: Auto merge of #145295 - Kobzol:unify-stages, r=jieyouxu
  commit[2] 2025-08-13: Auto merge of #145093 - nikic:dead-on-return, r=nnethercote
  commit[3] 2025-08-13: Auto merge of #145334 - Kobzol:rollup-fs5a133, r=Kobzol
  commit[4] 2025-08-13: Auto merge of #144722 - ywxt:parallel-reproducibile, r=SparrowLii
  commit[5] 2025-08-13: Auto merge of #145298 - nikic:llvm21-rc3, r=cuviper
  commit[6] 2025-08-13: Auto merge of #145366 - GuillaumeGomez:rollup-v0a6v3u, r=GuillaumeGomez

Fixes #140413.

r? @petrochenkov

[petrochenkov]

@bors squash msg="Add test for parallel compiler reproducible build"

[rust-bors]

🔨 2 commits were squashed into 2311296.

[petrochenkov]

@bors r+ rollup

[rust-bors]

📌 Commit 2311296 has been approved by petrochenkov

It is now in the queue for this repository.

[JonathanBrouwer]

💔 I suspect this PR failed tests as part of a rollup
@bors r-

After fixing the problem, consider running a try job for the failed job before re-approving.

Link to failure: #161942 (comment)

[rust-bors]

This pull request was unapproved.

View changes since this unapproval

[aerooneqq]

@bors try

[rust-bors]

☀️ Try build successful (CI)
Build commit: 79b4450 (79b44501b7128744112e5029076a6f3ad77c1ca1)
Base parent: 7022271 (70222712809cd5cc1718ed8995914a1cbacb6b92)

[petrochenkov]

@bors try jobs=armhf-gnu

@aerooneqq @bors try without options will do a different thing, it will run the dist-x86_64-linux job to produce a toolchain suitable for e.g. running rustc-perf or crater.

[rust-bors]

☀️ Try build successful (CI)
Build commit: 60001c5 (60001c5981f9f9431bfa6413074d9564e4263d80)
Base parent: 7022271 (70222712809cd5cc1718ed8995914a1cbacb6b92)

[aerooneqq]

@rustbot ready

[petrochenkov]

@bors r+

[rust-bors]

📌 Commit e8e8541 has been approved by petrochenkov

It is now in the queue for this repository.

[rust-timer]

Finished benchmarking commit (b6590ce): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.5%	[0.4%, 0.8%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.4%, -0.4%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary -2.0%)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.0%	[-2.0%, -2.0%]	1
All ❌✅ (primary)	-	-	0

Cycles

This perf run didn't have relevant results for this metric.

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: missing data
Artifact size: 400.59 MiB -> 400.65 MiB (0.01%)