Landing: 1b191d0a23f3

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Project / Subsystem

gcc / libstdc++

Date

2026-05-15

Author

Jonathan Wakely

Commit

1b191d0a23f3b82f6543913f8c3c2e46942af859

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 1b191d0a23f3b82f6543913f8c3c2e46942af859
source_type: github
headline: libstdc++: Fix atomic check on Windows for MinGW builds.
tldr: Fixes configure check for atomics on native MinGW-w64 builds in libstdc++.
author: Jonathan Wakely
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libstdc++
• mingw
• windows
• atomics
• configure
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1b191d0a23f3b82f6543913f8c3c2e46942af859
date: 2026-05-15T00:00:00.000Z

This commit resolves an issue where the configure script incorrectly detected a lack of atomic builtins for native MinGW-w64 builds, leading to the use of non-inline atomics. The fix involves copying the atomic_word.h header to the current working directory during the configure process, allowing it to be included without absolute paths. This ensures the correct ABI and consistent behavior with MinGW cross-compilers.