Landing: 4bf11aca586c

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Project / Subsystem

gcc / c++

Date

2026-10-03

Author

Jakub Jelinek

Commit

4bf11aca586c9eef753b6f76d29ae19e1b505694

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: 4bf11aca586c9eef753b6f76d29ae19e1b505694
source_type: github
headline: Implement C++29 P3950R1 for coroutines return values.
tldr: GCC now implements C++29 P3950R1, clarifying that coroutine return_value and return_void are not mutually exclusive.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• coroutines
• standardization
• compiler
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4bf11aca586c9eef753b6f76d29ae19e1b505694
date: 2026-10-03T00:00:00.000Z

GCC now implements C++29 paper P3950R1, which clarifies that the return_value and return_void promise members in C++ coroutines are not mutually exclusive. This change removes diagnostics that previously flagged errors when both return_void and return_value could be successfully looked up. The __cpp_impl_coroutine macro has been updated to reflect the C++29 standard version, and tests have been adjusted accordingly.