Landing: a33b41d895f5

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Project / Subsystem

gcc / c++

Date

2026-05-28

Author

Marek Polacek

Commit

a33b41d895f55fd95f8c9f486f6ef23c71a7a1e5

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: a33b41d895f55fd95f8c9f486f6ef23c71a7a1e5
source_type: github
headline: c++: Fix infinite looping with arr[arr] [PR125454]
tldr: Fixes an infinite recursion in C++ code when an array is indexed by itself, like arr[arr].
author: Marek Polacek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• bugfix
• compiler
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/a33b41d895f55fd95f8c9f486f6ef23c71a7a1e5
date: 2026-05-28T00:00:00.000Z

A recent change in GCC’s C++ front-end caused an infinite recursion when handling array indexing expressions of the form array[array]. The compiler would repeatedly swap the array and index, leading to a stack overflow. This commit prevents the canonicalization step from recursing when the array is indexed by itself.