Landing: e36fef054c03
Project / Subsystem
gcc / libstdc++
Date
2026-09-10
Author
Tomasz Kamiński
Commit
e36fef054c03112a4cd20a6ff0a3b3533c41f2b5
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- e36fef054c03112a4cd20a6ff0a3b3533c41f2b5
- source_type
- github
- headline
- libstdc++: Fix value-initialization for _Hashtable_ebo_helper members
- tldr
- libstdc++: Resolves a regression in unordered containers by correctly value-initializing EBO helper members.
- author
- Tomasz Kamiński
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • unordered_map
- • bugfix
- • C++
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-10T00:00:00.000Z
A regression in libstdc++‘s unordered containers has been fixed by properly value-initializing members of _Hashtable_ebo_helper. Previously, aggregate initialization with {} was ill-formed when members had explicit default constructors, breaking support for custom hashers, equality predicates, and allocators. This patch uses Type() syntax for value-initialization, ensuring correct initialization of all aggregate members and invocation of default constructors.