Landing: 26446cad5768

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Project / Subsystem

gcc / libstdc++

Date

2026-07-16

Author

Jakub Jelinek

Commit

26446cad5768b74f6c777ca135bc5bcfbd0f3f3d

Source

github

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Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 26446cad5768b74f6c777ca135bc5bcfbd0f3f3d
source_type: github
headline: Apply __no_specializations__ to several C++ standard library templates
tldr: Attribute added to library templates to prevent unintended specializations, resolving LWG issues.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libstdc++
• cpp
• template
• standard-library
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/26446cad5768b74f6c777ca135bc5bcfbd0f3f3d
date: 2026-07-16T00:00:00.000Z

The _Clang::__no_specializations__ attribute has been applied to several C++ standard library templates, including std::variant, std::tuple, std::initializer_list, and std::type_order. This change aims to prevent ill-formed specializations that would otherwise lead to compilation errors, addressing Library Working Group (LWG) issues.