Landing: 197dec13806e

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Project / Subsystem

gcc / libstdc++

Date

2026-07-01

Author

Tomasz Kamiński

Commit

197dec13806ec8d9d43089317884734e6c5d1140

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 197dec13806ec8d9d43089317884734e6c5d1140
source_type: github
headline: libstdc++: Extract optional<T&> specialization to bits/optional_ref.h.
tldr: Refactors libstdc++ headers to reduce dependencies and resolve cyclic includes.
author: Tomasz Kamiński
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libstdc++
• header
• dependency
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/197dec13806ec8d9d43089317884734e6c5d1140
date: 2026-07-01T00:00:00.000Z

The optional reference specialization and its related components have been moved to a new header, bits/optional_ref.h. This change aims to break cyclic dependencies, particularly for the header when handling exception_ptr_cast. By separating these definitions, the compiler can avoid issues related to header inclusion order. Additionally, inplace tags have been moved to bits/inplace_tags.h, further minimizing dependencies.