llvm/llvm-project

Missing changes for WG14 N3622

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#166,623 opened on Nov 5, 2025

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c2yclang:frontendgood first issue

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Description

8e60adcaafbd5b6859f54879496e017dd218e541 implemented part of the paper, but missed "shall not contain a definition of a modifiable object with static or thread storage duration" from the removed text. e.g., we still diagnose this:

inline void f(void) {
  static int x; // warning: on-constant static local variable in inline function may be different in different files
}

https://godbolt.org/z/PhK6YvYnP

This should be accepted in C2y mode and claimed as an extension in earlier language modes.

Contributor guide

Research direction
Examine the commit 8e60adcaafbd5b6859f54879496e017dd218e541 and the diagnostic for static local in inline functions. Ensure the diagnostic is not emitted in C2y mode and is claimed as an extension in earlier modes.
Tech stack
c
Domain
backend
Issue type
Bug
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
C
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70