Landing: b36454ad89d2

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Project / Subsystem

gcc / cobol

Date

2026-07-30

Author

James K. Lowden

Commit

b36454ad89d2b3c455e4f2033c860aa62549a289

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: cobol
patch_id: —
commit_hash: b36454ad89d2b3c455e4f2033c860aa62549a289
source_type: github
headline: cobol: New warning for REDEFINES placement, defaults to error
tldr: Introduces a new warning for REDEFINES not being the first item in a data definition, which defaults to an error.
author: James K. Lowden
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • cobol
• warning
• dialect
• data definition
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/b36454ad89d2b3c455e4f2033c860aa62549a289
date: 2026-07-30T00:00:00.000Z

A new warning, -Wredefines-first, is introduced for the COBOL compiler to flag instances where the REDEFINES clause is not the first item within a data item’s definition. By default, this condition is treated as an error, but the new warning flag allows developers to downgrade it to a warning or suppress it entirely. The ‘-dialect mf’ option automatically suppresses this warning.