Landing: b3bca9f73eb6

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Project / Subsystem

gcc / c++

Date

2026-08-14

Author

Patrick Palka

Commit

b3bca9f73eb6b29bddf5fec92e929f32675b8d20

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: b3bca9f73eb6b29bddf5fec92e929f32675b8d20
source_type: github
headline: Fix C++ constant evaluation in lambda scopes for PR126483.
tldr: C++ compiler now correctly handles constexpr evaluation within lambda scopes for PR126483.
author: Patrick Palka
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• constexpr
• lambda
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/b3bca9f73eb6b29bddf5fec92e929f32675b8d20
date: 2026-08-14T00:00:00.000Z

This change corrects an issue where the C++ compiler prematurely folded initializers within lambda scopes, leading to incorrect is_constant_evaluated results. The fix involves using maybe_constexpr_fn instead of DECL_DECLARED_CONSTEXPR_P to determine if a lambda scope is constexpr-suitable, ensuring correct constant evaluation behavior.