[all-commits] [llvm/llvm-project] 743428: [flang] Recognize compiler directives after expans...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 743428688fb0b3e6e6d466688a3930520d741aba
      https://github.com/llvm/llvm-project/commit/743428688fb0b3e6e6d466688a3930520d741aba
  Author: Peter Klausler <pklausler at nvidia.com>
  Date:   2026-03-02 (Mon, 02 Mar 2026)

  Changed paths:
    M flang/include/flang/Parser/preprocessor.h
    M flang/lib/Parser/preprocessor.cpp
    M flang/lib/Parser/prescan.cpp
    M flang/lib/Parser/prescan.h
    A flang/test/Preprocessing/bug178481.F90

  Log Message:
  -----------
  [flang] Recognize compiler directives after expansion in comment (#183626)

The compiler can recognize a compiler directive when one results from a
macro expansion at the beginning of a non-comment source line, as in
"#define FOO !$OMP". But it can't recognize a compiler directive that
initially appears as a comment line, as in "!BAR" after "#define BAR
$OMP". Extend the prescanner to recognize such cases in free form
source. (Fixed form is a much more complicated case for this recognition
and will be addressed later if needed.)

This is the 2nd version of this patch; the first was reverted after
problems with continuation lines were encountered.

Fixes https://github.com/llvm/llvm-project/issues/178481.



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