[all-commits] [llvm/llvm-project] b4f901: [flang] Make a non-digit in fixed-form label field...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b4f9012464144fc0f5c430dd97736c4e868a5de3
      https://github.com/llvm/llvm-project/commit/b4f9012464144fc0f5c430dd97736c4e868a5de3
  Author: Peter Klausler <pklausler at nvidia.com>
  Date:   2026-01-08 (Thu, 08 Jan 2026)

  Changed paths:
    M flang/lib/Parser/prescan.cpp
    M flang/lib/Parser/prescan.h
    M flang/test/Driver/Inputs/free-form-test.f90
    M flang/test/Driver/color-diagnostics-scan.f
    M flang/test/Driver/fixed-free-detection.f90
    M flang/test/Driver/fixed-free-flag.f90
    M flang/test/Driver/werror-scan.f
    M flang/test/Parser/badlabel.f
    A flang/test/Parser/bug50563.f
    M flang/test/Preprocessing/pp039.F

  Log Message:
  -----------
  [flang] Make a non-digit in fixed-form label field an error unless -E (#174836)

A character in a fixed-form source line (as opposed to a comment or
compiler directive) can't have a non-digit in its label field, columns 1
through 5. The prescanner presently emits only a warning for this case.
Retain the warning for -E output, but otherwise diagnose an error.

(This change affected a number of tests that relied on this situation
being a warning just so that they could test prescanner warnings, and
those tests were adjusted to use another warning.)

Fixes https://github.com/llvm/llvm-project/issues/50563.



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