Landing: 9aaedeaced05

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Project / Subsystem

gcc / gcc

Date

2026-04-26

Author

Martin Uecker

Commit

9aaedeaced055efe5041004e0643f4f3127c6ce9

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: 9aaedeaced055efe5041004e0643f4f3127c6ce9
source_type: github
headline: C: Argument expressions may be evaluated too often by typeof.
tldr: Fixes a bug where argument expressions within `typeof` were evaluated multiple times.
author: Martin Uecker
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c
• typeof
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/9aaedeaced055efe5041004e0643f4f3127c6ce9
date: 2026-04-26T00:00:00.000Z

When using typeof with multiple declarators in a declaration, argument expressions within typeof could be evaluated multiple times. This commit fixes the issue by adding a save_expr, which ensures that the expression is evaluated only once. This prevents unexpected side effects and ensures the program behaves as intended.