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SessionDiagnostic: Fix non-determinism in generated format string. - #76515

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Sep 10, 2020
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SessionDiagnostic: Fix non-determinism in generated format string.#76515
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jumbatm:issue76496-reproducibility-regression

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@jumbatm

@jumbatmjumbatm commented Sep 9, 2020

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@rust-highfiverust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 9, 2020
@jumbatm

jumbatm commented Sep 9, 2020•
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From #76496 (comment):

So the fix is twofold: First change all the HashSet and HashMap to FxHashSet and FxHashMap where possible, and second, collect to a Vec and sort that Vec before iterating over the set/map

rustc_macros can't depend on rustc_data_structures for FxHash* because it depends a circular dependency. Instead, I've switched to a BTreeSet so the iteration order is deterministic.

@jgalenson -- I know it's a bit of an ask, but can you confirm this fixes the problem?

@oli-obk

oli-obk commented Sep 9, 2020

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@bors r+

I think @jgalenson will see whether this fixes it once this is in nightly and their script runs again

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bors commented Sep 9, 2020

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📌 Commit 8b39250 has been approved by oli-obk

@borsbors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 9, 2020
@oli-obk

oli-obk commented Sep 9, 2020

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Instead, I've switched to a BTreeSet so the iteration order is deterministic.

Perfect! This is much better. The FxHashSet stuff is only for speed, not determinism anyway

@jyn514jyn514 added A-reproducibility Area: Reproducible / deterministic builds T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 9, 2020
@jgalenson

jgalenson commented Sep 9, 2020

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Thanks for the patch! I've started some runs to see if this fixes the problem; I'll reply again when they're done.

@jgalenson

jgalenson commented Sep 9, 2020

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Yes, it seems to solve the problem. Thanks!

@jumbatm

jumbatm commented Sep 9, 2020

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No worries - thank you for checking :)

@tmandrytmandry mentioned this pull request Sep 9, 2020
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bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 9, 2020
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Auto merge ofrust-lang#76540- tmandry:rollup-5ogt8x0, r=tmandry
97eb606
Rollup of 14 pull requests
Successful merges:
- rust-lang#75094 (Add `-Z combine_cgu` flag)
- rust-lang#75984 (Improve unresolved use error message)
- rust-lang#76141 (Address review comments about config.toml from rustc-dev-guide PR)
- rust-lang#76313 (Improved the MIR spanview output)
- rust-lang#76430 (Add align to rustc-attrs unstable book)
- rust-lang#76465 (Add a script to automatically update Rust/Clang versions in documentation)
- rust-lang#76473 (Add missed spaces to GCC-WARNING.txt)
- rust-lang#76481 (Convert repetitive target_pointer_width checks to const solution.)
- rust-lang#76493 (Remove a stray ignore-tidy-undocumented-unsafe)
- rust-lang#76504 (Capitalize safety comments)
- rust-lang#76515 (SessionDiagnostic: Fix non-determinism in generated format string.)
- rust-lang#76516 (Enable GitHub Releases synchronization)
- rust-lang#76522 (remove redundant clones)
- rust-lang#76523 (Remove unused PlaceContext::NonUse(NonUseContext::Coverage))
Failed merges:
r? `@ghost`
@bors
bors merged commit 98f59bc into rust-lang:masterSep 10, 2020
@rustbotrustbot added this to the 1.48.0 milestone Sep 10, 2020
@jieyouxujieyouxu mentioned this pull request Aug 14, 2024
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A-reproducibilityArea: Reproducible / deterministic buildsS-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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Successfully merging this pull request may close these issues.

Reproducibility regression caused by 57edf88

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