time: use C altzone when available#8357
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📝 WalkthroughWalkthroughThe host environment now detects CPython-compatible ChangesHost altzone support
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Cargo
participant BuildScript as host_env build.rs
participant CCompiler as C compiler
participant HostTime as host_env time::tz
participant PythonTime as Python time module
Cargo->>BuildScript: Run build script
BuildScript->>CCompiler: Compile altzone probe
CCompiler-->>BuildScript: Return compilation status
BuildScript-->>Cargo: Emit has_altzone cfg when supported
PythonTime->>HostTime: Request altzone()
alt has_altzone
HostTime-->>PythonTime: Return native altzone
else fallback
HostTime-->>PythonTime: Return timezone() - 3600
end
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@crates/host_env/build.rs`:
- Around line 21-25: Update the cross-compilation guard in build.rs to detect
target-specific compiler variables supported by cc::Build—CC_<target>,
CC_<target_with_underscores>, and TARGET_CC—before returning. Only skip the
altzone probe when host and target differ and none of these compiler settings
are present; preserve the existing cc::Build compiler resolution afterward.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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Run ID: 8279beb4-35d7-49b8-bba8-4514bbf2f0a4
⛔ Files ignored due to path filters (1)
Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (4)
crates/host_env/Cargo.tomlcrates/host_env/build.rscrates/host_env/src/time.rscrates/vm/src/stdlib/time.rs
lms0806
marked this pull request as draft
July 23, 2026 23:43
lms0806
marked this pull request as ready for review
July 23, 2026 23:46
ShaharNaveh
approved these changes
Jul 24, 2026
ShaharNaveh
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lgtm overall!
tysm:)
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Summary
Fixed an issue where the existing
altzonewas simply calculated astimezone - 3600without checking for the presence ofaltzoneinlibc.During the build process, the code now checks for the existence of
altzoneand implements logic consistent with CPython.Summary by CodeRabbit
time.altzoneaccuracy by using the host-provided native daylight-saving offset when available.