Landing: a5407eb736fe

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Project / Subsystem

gcc / cobol

Date

2026-08-03

Author

James K. Lowden

Commit

a5407eb736feab6e8778c0899fbf4626ee506a60

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: cobol
patch_id: —
commit_hash: a5407eb736feab6e8778c0899fbf4626ee506a60
source_type: github
headline: Cobol: Fix lexer overflow error with variable-length patterns.
tldr: Cobol lexer no longer overflows on long matches.
author: James K. Lowden
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • cobol
• compiler
• lexer
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/a5407eb736feab6e8778c0899fbf4626ee506a60
date: 2026-08-03T00:00:00.000Z

An internal compiler error in the COBOL lexer, triggered by an ‘input buffer overflow’ when processing long variable-length patterns, has been resolved. The fix uses flex’s input() and unput() functions to manage the input stream more effectively before pattern matching, preventing the overflow and associated errors.