[all-commits] [llvm/llvm-project] f6758a: [flang] Fix -E -dM macro dumping for stdin and .f9...

[ejose02 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f6758a5664a61596ea601ea44304aab798c33962
      https://github.com/llvm/llvm-project/commit/f6758a5664a61596ea601ea44304aab798c33962
  Author: ejose02 <ejose at amd.com>
  Date:   2026-05-28 (Thu, 28 May 2026)

  Changed paths:
    M flang/lib/Frontend/FrontendAction.cpp
    A flang/test/Preprocessing/show-macros-stdin.f90

  Log Message:
  -----------
  [flang] Fix -E -dM macro dumping for stdin and .f90 inputs (#200144)

Issue:
flang -E -dM does not consistently print predefined macros for stdin and
.f90 inputs, unlike expected behavior.

Root cause:
Flang only initialized predefined macros when preprocessing was implied
by -cpp or suffix-based inference (mustBePreprocessed), but not when -dM
alone requested macro dumping.

Fix:
Treat -dM as an explicit trigger to initialize macro predefinitions in,
and add a stdin regression test for flang -E -dM - < /dev/null.

Fixes #198234



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