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[Fortran] preprocessor of NAG compiler has limits

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#90 opened on Jun 30, 2025

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Description

Some Fortran codebases actively uses #include preprocessor statements. Usually, it compiles nicely, however, preprocessor of NAG compiler has the following limits:

Item Limits
Maximum INCLUDE file nesting 20
Maximum number of INCLUDE file references per compilation 2047

Then, one needs to adjust codebase to avoid this limitations.

It would be nice to check number of #include preprocessor statements and give warnings if their number exceeds NAG limits.

NAG compiler limits: https://support.nag.com/nagware/np/r72_doc/manual/compiler_2_7.html#LIMITS

Contributor guide

Research direction
Identify where #include preprocessor statements are processed in the codebase, then add logic to count them and warn when the NAG compiler limits are exceeded.
Tech stack
None
Domain
toolingcompilers
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
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.
75