Landing: 11be877aea73

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Project / Subsystem

gcc / fortran

Date

2026-07-08

Author

Jerry DeLisle

Commit

11be877aea73b0b26638078908a42dd0f97d81d7

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: fortran
patch_id: —
commit_hash: 11be877aea73b0b26638078908a42dd0f97d81d7
source_type: github
headline: Fortran: Fix NEWUNIT state corruption during internal file I/O
tldr: Internal file I/O operations no longer corrupt the unit management table in libgfortran.
author: Jerry DeLisle
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • fortran
• compiler
• runtime
• io
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/11be877aea73b0b26638078908a42dd0f97d81d7
date: 2026-07-08T00:00:00.000Z

A bug in libgfortran’s internal unit management corrupted its state when performing internal file I/O, such as writing to a character variable. This commit introduces a new boolean flag in the gfc_unit structure to track units designated for internal I/O, preventing corruption and ensuring correct behavior. A new test case validates this fix.