Landing: 77d5b22efb2b

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Project / Subsystem

gcc / fortran

Date

2026-05-26

Author

Jerry DeLisle

Commit

77d5b22efb2b0c291b572f087371d7dc462d5499

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: fortran
patch_id: —
commit_hash: 77d5b22efb2b0c291b572f087371d7dc462d5499
source_type: github
headline: Gfortran adds support for Fortran 2023 EX format read.
tldr: The Gfortran compiler now implements the Fortran 2023 `EX` edit-descriptor for reading hexadecimal-significand or decimal floating-point input.
author: Jerry DeLisle
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • fortran
• language feature
• io
• numerical computing
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/77d5b22efb2b0c291b572f087371d7dc462d5499
date: 2026-05-26T00:00:00.000Z

The Gfortran compiler now fully supports the EX edit-descriptor for READ statements, as specified in Fortran 2023. This new functionality in libgfortran’s read.c allows reading floating-point values presented in hexadecimal-significand form (e.g., 0X1.AP+0) for exact conversion, or as standard decimal input. It also handles INF and NAN representations, respecting BN/BZ blank handling and kP scale factors, enabling robust and standard-compliant input processing for advanced floating-point literals.