Landing: 9f42a810e669

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Project / Subsystem

gcc / c++

Date

2026-05-15

Author

Jason Merrill

Commit

9f42a810e6693a85ed312ca80854733daba75037

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: 9f42a810e6693a85ed312ca80854733daba75037
source_type: github
headline: Handles constexpr nested empty objects correctly.
tldr: GCC now correctly handles nested empty objects in constexpr contexts, preventing errors during compile-time evaluation.
author: Jason Merrill
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• constexpr
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/9f42a810e6693a85ed312ca80854733daba75037
date: 2026-05-15T00:00:00.000Z

GCC’s handling of constexpr nested empty objects was corrected. The compiler did not always create a constructor for the outer object, leading to issues when the inner object needed a context for initialization. This commit ensures that both the constructor and the object can be null for an empty subobject in constexpr contexts. A new test case, g++.dg/cpp2a/no_unique_address16.C, was added.