Landing: 020e02fcf281
Project / Subsystem
gcc / libstdc++
Date
2026-07-14
Author
Tomasz Kamiński
Commit
020e02fcf281bd24065c8663219a22aba9d0a47d
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- 020e02fcf281bd24065c8663219a22aba9d0a47d
- source_type
- github
- headline
- libstdc++: Resolve UNTIL save adjustment for named-rule zones
- tldr
- Fixes inaccurate sys_info windows caused by incorrect DST transition handling in time zone data.
- author
- Tomasz Kamiński
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • timezone
- • bugfix
- discussion_id_link
- github:gcc-mirror/gcc#116110
- bugzilla_pr
- —
- date
- 2026-07-14T00:00:00.000Z
This commit resolves an issue in libstdc++ where time zone data for zones with wall-time UNTIL clauses and named rule sets was incorrectly parsed. Specifically, it affected zones like Africa/Algiers around 1977, causing brief incorrect sys_info windows during DST transitions. The fix defers save adjustment to _M_get_sys_info and correctly handles rule lookups, ensuring consistency with the canonical zic interpretation.