Landing: 674b607b560e

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Project / Subsystem

gcc / libstdc++

Date

2026-09-09

Author

Iain Sandoe

Commit

674b607b560e29f39b647eeea62198a48c26331d

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 674b607b560e29f39b647eeea62198a48c26331d
source_type: github
headline: libstc++, configure: Check for timing APIs even if _POSIX_TIMERS is -1.
tldr: Configure script now correctly detects timing APIs like clock_gettime on systems where POSIX timers are not strictly advertised.
author: Iain Sandoe
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • configure
• libstdc++
• timing
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/674b607b560e29f39b647eeea62198a48c26331d
date: 2026-09-09T00:00:00.000Z

The GCC configure script previously guarded checks for timing APIs like nanosleep and clock_gettime based on the _POSIX_TIMERS macro. This commit modifies the check to test for the APIs directly, even if _POSIX_TIMERS is set to -1, which indicates a non-compliant implementation rather than absent APIs. This allows detection of these APIs on systems like Darwin where they are available but not POSIX-compliant.