Landing: 306f4aef1409

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Project / Subsystem

gcc / libstdc++

Date

2026-07-17

Author

Tomasz Kamiński

Commit

306f4aef140910bfc803fe9c894b12615b35aac7

Source

github

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Breaking

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project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 306f4aef140910bfc803fe9c894b12615b35aac7
source_type: github
headline: libstdc++: Use __FLT_EVAL_METHOD__ for piecewise distribution tests
tldr: Adapts random distribution tests to account for floating-point evaluation methods.
author: Tomasz Kamiński
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libstdc++
• testing
• floating-point
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/306f4aef140910bfc803fe9c894b12615b35aac7
date: 2026-07-17T00:00:00.000Z

Tests for piecewise_constant_distribution and piecewise_linear_distribution in libstdc++ now correctly account for the effects of __FLT_EVAL_METHOD__. This macro controls the precision with which intermediate floating-point expressions are evaluated. By guarding the relevant test invocations with checks against this macro, the tests avoid spurious failures caused by differing floating-point evaluation strategies across compilation environments.