Landing: 1904b9207203

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Project / Subsystem

gcc / fortran

Date

2026-05-07

Author

Harald Anlauf

Commit

1904b9207203bbe45d6ce6a472d6a0c7e1bbd873

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: fortran
patch_id: —
commit_hash: 1904b9207203bbe45d6ce6a472d6a0c7e1bbd873
source_type: github
headline: Fortran: Fixed automatic deallocation with derived type IO.
tldr: Corrects an issue in Fortran derived type IO that prevented automatic deallocation of local variables by adjusting the function specification.
author: Harald Anlauf
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • fortran
• dtio
• memory management
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1904b9207203bbe45d6ce6a472d6a0c7e1bbd873
date: 2026-05-07T00:00:00.000Z

This commit resolves an issue in the Fortran compiler related to derived type input/output (DTIO). The compiler was incorrectly forcing allocatable instances of derived types used in IO operations to be static, preventing automatic deallocation of local variables. This was due to a misconfiguration in the function specification for _gfortran_transfer_derived, where the IO variable was incorrectly declared as read-only. Changing the specification to indicate write access resolves the problem and allows for proper automatic deallocation. A new test case verifies the fix.