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43d551a2

by Simon Jakobi at 2026-03-22T11:59:12+01:00

Add regression test for #18177

Closes #18177.

Assisted-by: Codex

+module T18177 where

@@ -314,6 +314,12 @@ test('MultiRootsErr', normal, multimod_compile_fail, ['MultiRootsErr', 'MultiRoo
  test('patch-level2', normal, compile, ['-Wcpp-undef'])
  test('T16476a', normal, makefile_test, [])
  test('T16476b', normal, makefile_test, [])
++
 +# Test that GHC can handle an empty preprocessor response file.
 +# This used to cause GHC to hang indefinitely: #18177
 +test('T18177', [pre_cmd('touch cpp-args')], compile,
 +     ['-v0 -fforce-recomp -fhpc -optP@cpp-args -optP-DX'])
++
  test('T20569', extra_files(["T20569/"]), makefile_test, [])
  test('T21866', normal, multimod_compile, ['T21866','-no-link'])
  test('T21349', extra_files(['T21349']), makefile_test, [])