Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-16 02:15 UTC

rust-lang / compiler-builtins

Rust implementations of compiler-rt and libm

RustCustom license★ 519 stars⑂ 287 forkssince Aug 2016View on GitHub ↗

rust-lang/compiler-builtins holds a health index of 94 out of 100, placing it in the Exceptional band. It scores highest on Vitality (91/100) and lowest on AI Readiness (70/100). It was last updated 5 days ago. 3 contributors account for most of its recent work.

94
overall / 100
Exceptional

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

94
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 81 is calibrated to 94 on the published index scale (record calibration 2026-08-02).

Ownership

The Rust Programming LanguageOrganization · verified domain
18,300 followers246 public repossince Sep 2013

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
crates.iolibm0.2.1637,794,73122234 days agomathlibmno-std
crates.iocompiler_builtins0.1.160364,692151473 days ago—

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

91Excellent · 21% of overall
How it's scored
36/36Push recency — last push 5 days ago
34.6/36Commit cadence — 50/52 weeks with commits
18/18Commit volume — 940 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 12 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year940
human_commit_share1
days_since_last_push5
active_weeks_last_year50
How it's scored
27/27Ships releases — 49 releases published
16.2/36Release recency — latest release 234 days ago
27/27Release cadence — a release every ~30.8 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count49
latest_release_taglibm-v0.2.16
releases_from_tagsno
days_since_latest_release234
mean_days_between_releases30.8
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

76Good · 17% of overall
How it's scored
44/60Stars — 519 stars
20.5/25Forks — 287 forks
8/15Watchers — 28 watchers
Inputs used
forks287
stars519
watchers28
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history
How it's scored
22.5/22.5README
16.9/22.5License — license file present, not a recognized license
18/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges0
has_contributingyes
has_issue_templateno
has_code_of_conductno
readme_badge_services—
has_pull_request_templateno
How it's scored
80/80Monthly downloads — 38,159,423 downloads/month across crates
0/20Registry dependents — not reported by this ecosystem
Inputs used
packageslibm, compiler_builtins
dependents—
ecosystemscrates
total_downloads500,622,568
monthly_downloads38,159,423
unverified_packages_excluded—
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

86Excellent · 23% of overall
How it's scored
36/54Bus factor — 3 contributor(s) cover half of all commits
15.5/22.5Commit distribution — top contributor authored 31% of commits
13.5/13.5Contributor breadth — 97 contributors
10/10OpenSSF Scorecard: Contributors — project has 44 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled97
top_contributor_share0.31
How it's scored
35.3/42Issue resolution — 84% of issues closed
26.5/30PR acceptance — 912/1,032 decided PRs merged
10.8/13Newcomer PR acceptance — 5/6 first-time contributors' PRs merged in 30d
7.5/15OpenSSF Scorecard: Code-Review — Found 2/4 approved changesets -- score normalized to 5
Inputs used
merged_prs912
open_issues41
closed_issues216
prs_merged_7d1
prs_decided_7d1
prs_merged_30d35
prs_decided_30d38
issue_closed_ratio0.84
closed_unmerged_prs120
first_time_authors_30d5
first_time_prs_merged_30d5
first_time_prs_decided_30d6
How it's scored
30/30Ownership backing — organization-owned
20/20Verified domain
25/25Owner reach — 18,300 followers of rust-lang
25/25Track record — 246 public repos, account ~13 yr old
Inputs used
followers18,300
owner_typeOrganization
is_verifiedyes
owner_loginrust-lang
public_repos246
account_age_days4,753
How it's scored
25/25Published & resolvable — 2 package(s) on crates
26/35Publish recency — latest publish 234 days ago
20/20Version history — 151 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packageslibm, compiler_builtins
ecosystemscrates
any_deprecatedno
min_days_since_publish234

Engineering Quality

Are baseline engineering and documentation practices in place?

76Good · 19% of overall
How it's scored
24/24CI workflows — 3 workflow(s)
24/24Tests present
16/16Linter config — .rustfmt.toml, builtins-test/Cargo.toml ([lints]), libm/Cargo.toml ([lints])
0/9.6Pre-commit hooks
6.4/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 5 out of 5 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigyes
has_linter_configyes
has_precommit_configno

Documentation

55Moderate
How it's scored
30/30README
0/25Documentation directory
15/15Documentation / homepage site — https://docs.rs/compiler_builtins
10/10Repository description
0/10Topics
0/10Wiki
Inputs used
topics—
has_wikino
homepage—
docs_sitehttps://docs.rs/compiler_builtins
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

75Good · 16% of overall
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
2.2/7.5Branch-Protection — branch protection is not maximal on development and all release branches
2.5/2.5CI-Tests — 5 out of 5 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
3.8/7.5Code-Review — Found 2/4 approved changesets -- score normalized to 5
2.5/2.5Contributors — project has 44 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.2/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 12 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
1.5/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 3
5/5SAST — SAST tool is run on all commits
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
6.8/7.5Vulnerabilities — 1 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate6.9
Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages4
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the crates:compiler_builtins@0.1.160 runtime dependency closure — what installing the published package pulls in — 4 packages. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

70Good · 4% of overall
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 89 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.89
agent_instruction_files—
agent_instruction_max_bytes—
How it's scored
12.6/18One-command bootstrap — Cargo.toml, builtins-shim/Cargo.toml, builtins-test-intrinsics/Cargo.toml (toolchain convention, no task runner)
22/22Automated tests
11/11Lint / format config — .rustfmt.toml, builtins-test/Cargo.toml ([lints]), libm/Cargo.toml ([lints])
11/11Static type checking — Rust (statically typed)
10/10Reproducible environment — Dockerfile, lockfile
0/10Demonstrated agent practice — no agent-authored commits among the last 100
0/8Automated maintenance — no automated dependency updates observed
3/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 3
Inputs used
has_nixno
has_testsyes
lockfilesCargo.lock
has_dockerfileyes
typed_languageyes
bootstrap_files—
has_devcontainerno
has_linter_configyes
typecheck_configs—
agent_commit_share0
toolchain_manifestsCargo.toml, builtins-shim/Cargo.toml, builtins-test-intrinsics/Cargo.toml, builtins-test/Cargo.toml, compiler-builtins/Cargo.toml, crates/api-list-common/Cargo.toml, crates/libm-macros/Cargo.toml, crates/musl-math-sys/Cargo.toml, crates/panic-handler/Cargo.toml, crates/symcheck/Cargo.toml, crates/update-api-list/Cargo.toml, crates/util/Cargo.toml, libm-test/Cargo.toml, libm/Cargo.toml
dependency_bot_commit_share0
How it's scored
45/45Type-checkable code — Rust (statically typed)
55/55Manageable file sizes — 0/300 source files over 60KB
Inputs used
primary_languageRust
largest_source_bytes41,788
source_files_sampled300
oversized_source_files0
How it's scored
0/40API schema (OpenAPI/GraphQL/proto) — not applicable to this kind of software
0/20MCP server — not applicable to this kind of software
40/40Runnable examples — examples
Inputs used
example_dirsexamples
has_mcp_signalno
api_schema_files—
interfaces_expected_of—
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto), MCP server. Remaining weights renormalized.

Key facts

519GitHub stars
97contributors
940commits, last 12 months
5days since last push
49releases
3bus factor
41open issues
crates.iopackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • Could not fetch crates package 'libm-test' from its registry
  • Could not fetch crates package 'builtins-test' from its registry
  • Could not fetch crates package 'builtins-test-intrinsics' from its registry

More detail

Star and fork history 0 ★ / 287 ⇿
0Stars
287Forks
49Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

05010015020025030027052016-082021-082026-09
Major 0Minor 0Patch 0

Each point covers 10 days.

OpenSSF Scorecard 6.9 / 10
6.9aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-09-16 02:14 UTC

10Binary-Artifactsno binaries found in the repo
3Branch-Protectionbranch protection is not maximal on development and all release branches
10CI-Tests5 out of 5 merged PRs checked by a CI test -- score normalized to 10
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
5Code-ReviewFound 2/4 approved changesets -- score normalized to 5
10Contributorsproject has 44 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
9Licenselicense file detected
10Maintained30 commit(s) and 12 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
3Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 3
10SASTSAST tool is run on all commits
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
9Vulnerabilities1 existing vulnerabilities detected
Direct dependencies 23
RegistryPackageVersion constraintManifest
crates.iocompiler_builtins—builtins-test-intrinsics/Cargo.toml
crates.iopanic-handler—builtins-test-intrinsics/Cargo.toml
crates.iocompiler_builtins—builtins-test/Cargo.toml
crates.iorand_xoshiro—builtins-test/Cargo.toml
crates.iorustc_apfloat—builtins-test/Cargo.toml
crates.iocriterion—builtins-test/Cargo.toml
crates.iogungraun—builtins-test/Cargo.toml
crates.iocore—compiler-builtins/Cargo.toml
crates.ioanyhow—libm-test/Cargo.toml
crates.ioapi-list-common—libm-test/Cargo.toml
crates.iocompiler_builtins—libm-test/Cargo.toml
crates.iogmp-mpfr-sys—libm-test/Cargo.toml
crates.ioindicatif—libm-test/Cargo.toml
crates.iolibm—libm-test/Cargo.toml
crates.iolibm-macros—libm-test/Cargo.toml
crates.iomusl-math-sys—libm-test/Cargo.toml
crates.iopaste—libm-test/Cargo.toml
crates.iorand—libm-test/Cargo.toml
crates.iorand_chacha—libm-test/Cargo.toml
crates.iorayon—libm-test/Cargo.toml
crates.iorug—libm-test/Cargo.toml
crates.iocriterion—libm-test/Cargo.toml
crates.iogungraun—libm-test/Cargo.toml
All dependencies 164

Full resolved dependency set from the GitHub dependency graph: 13 direct and 151 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
crates.ioanyhow1.0.104direct
crates.iocriterion0.8.2direct
crates.iogmp-mpfr-sys1.7.1direct
crates.iogungraun0.19.4direct
crates.ioindicatif0.18.6direct
crates.iolibm0.2.16direct
crates.iopaste1.0.15direct
crates.iorand0.10.2direct
crates.iorand_chacha0.10.0direct
crates.iorand_xoshiro0.8.1direct
crates.iorayon1.12.0direct
crates.iorug1.30.0direct
crates.iorustc_apfloat0.2.3+llvm-462a31f5a5abdirect
crates.ioadler22.0.1indirect
crates.ioaho-corasick1.1.5indirect
crates.ioalloca0.4.0indirect
crates.ioanes0.1.6indirect
crates.ioanstream1.0.0indirect
crates.ioanstyle1.0.14indirect
crates.ioanstyle-parse1.0.0indirect
crates.ioanstyle-query1.1.5indirect
crates.ioanstyle-wincon3.0.11indirect
crates.ioassert_cmd2.2.2indirect
crates.ioautocfg1.5.1indirect
crates.ioaz1.3.0indirect
crates.iobincode-next3.1.1indirect
crates.iobitflags2.13.1indirect
crates.iobstr1.13.1indirect
crates.iobumpalo3.20.3indirect
crates.iocast0.3.0indirect
crates.iocc—indirect
crates.iocc1.4.4indirect
crates.iocfg-if1.0.4indirect
crates.iochacha200.10.2indirect
crates.iociborium0.2.2indirect
crates.iociborium-io0.2.2indirect
crates.iociborium-ll0.2.2indirect
crates.ioclap4.6.6indirect
crates.ioclap_builder4.6.6indirect
crates.ioclap_derive4.6.4indirect
crates.ioclap_lex1.1.0indirect
crates.iocolorchoice1.0.5indirect
crates.ioconsole0.16.4indirect
crates.iocpufeatures0.3.1indirect
crates.iocrc32fast1.5.1indirect
crates.iocriterion-plot0.8.2indirect
crates.iocrossbeam-deque0.8.7indirect
crates.iocrossbeam-epoch0.9.20indirect
crates.iocrossbeam-utils0.8.22indirect
crates.iocrunchy0.2.4indirect
crates.ioderive_more2.1.1indirect
crates.ioderive_more-impl2.1.1indirect
crates.iodiff0.1.13indirect
crates.iodifflib0.4.0indirect
crates.ioeither1.18.0indirect
crates.ioeither-or-both0.3.1indirect
crates.ioencode_unicode1.0.0indirect
crates.ioequivalent1.0.2indirect
crates.ioerrno0.3.14indirect
crates.ioescape82590.5.3indirect
crates.iofastrand2.5.0indirect
crates.iofind-msvc-tools0.1.11indirect
crates.ioflate21.1.10indirect
crates.iofutures-core0.3.34indirect
crates.iofutures-task0.3.34indirect
crates.iofutures-util0.3.34indirect
crates.iogetopts0.2.24indirect
crates.iogetrandom0.4.3indirect
crates.ioglob0.3.4indirect
crates.iogungraun-macros0.9.1indirect
crates.iogungraun-runner0.19.4indirect
crates.iohalf2.7.1indirect
crates.iohashbrown0.17.1indirect
crates.ioheck0.5.0indirect
crates.ioindexmap2.14.1indirect
crates.iois_terminal_polyfill1.70.2indirect
crates.ioitertools0.13.0indirect
crates.ioitoa1.0.18indirect
crates.iojs-sys0.3.104indirect
crates.iolibc0.2.189indirect
crates.iolibtest-mimic0.8.2indirect
crates.iolinux-raw-sys0.12.1indirect
crates.iomemchr2.8.3indirect
crates.iominiz_oxide0.9.1indirect
crates.iono-panic—indirect
crates.iono-panic0.1.37indirect
crates.ionum-traits0.2.19indirect
crates.ioobject0.40.0indirect
crates.ioonce_cell1.21.4indirect
crates.ioonce_cell_polyfill1.70.2indirect
crates.iooorandom11.1.5indirect
crates.iopage_size0.6.0indirect
crates.iopastey0.2.3indirect
crates.iopin-project-lite0.2.17indirect
crates.ioplotters0.3.7indirect
crates.ioplotters-backend0.3.7indirect
crates.ioplotters-svg0.3.7indirect
crates.ioportable-atomic1.15.0indirect
crates.ioppv-lite860.2.21indirect
crates.iopredicates3.1.4indirect
crates.iopredicates-core1.0.10indirect
crates.iopredicates-tree1.0.13indirect
crates.iopretty_assertions1.4.1indirect
crates.ioproc-macro-error-attr33.1.1indirect
crates.ioproc-macro-error33.1.1indirect
crates.ioproc-macro21.0.107indirect
crates.ioquote1.0.47indirect
crates.ior-efi6.0.0indirect
crates.iorand_core0.10.1indirect
crates.iorapidhash4.5.1indirect
crates.iorayon-core1.13.0indirect
crates.ioregex1.13.1indirect
crates.ioregex-automata0.4.18indirect
crates.ioregex-syntax0.8.11indirect
crates.iorustc_version0.4.1indirect
crates.iorustix1.1.4indirect
crates.iorustversion1.0.23indirect
crates.ioruzstd0.9.0indirect
crates.iosame-file1.0.6indirect
crates.iosc0.2.7indirect
crates.iosemver1.0.28indirect
crates.ioserde1.0.229indirect
crates.ioserde_core1.0.229indirect
crates.ioserde_derive1.0.229indirect
crates.ioserde_json1.0.151indirect
crates.ioshlex2.0.1indirect
crates.iosimd-adler320.3.10indirect
crates.ioslab0.4.12indirect
crates.iosmallvec1.15.2indirect
crates.iostrsim0.11.1indirect
crates.iosyn2.0.119indirect
crates.iosyn3.0.4indirect
crates.iotempfile3.27.0indirect
crates.iotermtree0.5.1indirect
crates.iotest0.1.0indirect
crates.iotinytemplate1.2.1indirect
crates.iotwox-hash2.1.4indirect
crates.iounicode-ident1.0.24indirect
crates.iounicode-width0.2.2indirect
crates.iounit-prefix0.5.2indirect
crates.iounty-next0.1.2indirect
crates.ioutest-cortex-m-qemu0.1.0indirect
crates.ioutest-macros0.1.0indirect
crates.ioutf8parse0.2.2indirect
crates.iowait-timeout0.2.1indirect
crates.iowalkdir2.5.0indirect
crates.iowasm-bindgen0.2.127indirect
crates.iowasm-bindgen-macro0.2.127indirect
crates.iowasm-bindgen-macro-support0.2.127indirect
crates.iowasm-bindgen-shared0.2.127indirect
crates.iowasmparser0.255.0indirect
crates.ioweb-sys0.3.104indirect
crates.ioweb-time1.1.0indirect
crates.iowinapi0.3.9indirect
crates.iowinapi-i686-pc-windows-gnu0.4.0indirect
crates.iowinapi-util0.1.11indirect
crates.iowinapi-x86_64-pc-windows-gnu0.4.0indirect
crates.iowindows-link0.2.1indirect
crates.iowindows-sys0.61.2indirect
crates.ioyansi1.0.1indirect
crates.iozerocopy0.8.56indirect
crates.iozerocopy-derive0.8.56indirect
crates.iozlib-rs0.6.7indirect
crates.iozmij1.0.23indirect
Dependency advisories 0

Installing crates:compiler_builtins@0.1.160 pulls in 4 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.

No known advisories affect the assessed dependencies.

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — crates.io.