Landing: ec2b5122e1f5

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Project / Subsystem

gcc / c++

Date

2026-07-07

Author

Marek Polacek

Commit

ec2b5122e1f52409f7207539cc821424fa209ad7

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: ec2b5122e1f52409f7207539cc821424fa209ad7
source_type: github
headline: Fix C++ ICE with requires clauses and sequence point warning.
tldr: C++ compiler avoids internal compiler error when `requires` clauses are processed with `-Wsequence-point`.
author: Marek Polacek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• compiler bug
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/ec2b5122e1f52409f7207539cc821424fa209ad7
date: 2026-07-07T00:00:00.000Z

An Internal Compiler Error (ICE) in GCC’s C++ frontend has been fixed, which occurred when processing requires clauses in conjunction with the -Wsequence-point warning. The issue stemmed from the compiler attempting to analyze expressions within the requires clause as if they were evaluated in a standard context, leading to incorrect handling of a MODOP_EXPR. By marking REQUIRES_EXPR as ‘tcc_exceptional’, the compiler now correctly identifies these expressions as non-standard and avoids walking them in contexts where they are not expected, preventing the ICE.