Landing: 1801e9f04231

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Project / Subsystem

gcc / c++/reflection

Date

2026-10-02

Author

Marek Polacek

Commit

1801e9f042319e934045f3d4aaaa3ba40e22d017

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++/reflection
patch_id: —
commit_hash: 1801e9f042319e934045f3d4aaaa3ba40e22d017
source_type: github
headline: c++/reflection: Correct error for block-scope using [:ns:]::S.
tldr: Fixes a bogus error when using dependent namespaces with C++ reflection in block scopes.
author: Marek Polacek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• compiler
• reflection
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1801e9f042319e934045f3d4aaaa3ba40e22d017
date: 2026-10-02T00:00:00.000Z

This commit corrects an erroneous error message in C++ reflection when using dependent namespaces within a block scope, such as using [:ns:]::S; where ns is dependent. Previously, the compiler incorrectly reported that :: was not a class, namespace, or enumeration. The fix ensures that tsubst_stmt correctly handles NAMESPACE_DECL for dependent namespaces, which is necessary following the introduction of P2996.