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[Fortran] check the length of internal file

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#101 opened on Sep 11, 2025

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CFortrangood first issuehelp wanted

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Description

With the following example, gfortran has runtime error:

program main
  character(len=5) :: s
  write(s, '(3I0)') [11, 22, 33]
  print '(a)', s
end program main

since the written string is longer than string s.

It would be nice to have a check that will determine such situations (especially when runtime values are used).

Contributor guide

Research direction
Investigate Fortran standard rules on internal file length and how gfortran handles runtime errors. Explore existing static analysis tools or compiler options that can warn about potential truncation.
Tech stack
None
Domain
tooling
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Fortran
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60