(-- )?From subdir1:
  CMP0180-OLD_SOURCE_DIR = [^
]+/project/subdir1
  CMP0180-OLD_BINARY_DIR = [^
]+/project/CMP0180-OLD-build/subdir1
  CMP0180-OLD_IS_TOP_LEVEL = OFF
(-- )?From subdir2:
  CMP0180-OLD_SOURCE_DIR = [^
]+/project/subdir1
  CMP0180-OLD_BINARY_DIR = [^
]+/project/CMP0180-OLD-build/subdir1
  CMP0180-OLD_IS_TOP_LEVEL = OFF
(-- )?  sub2proj_SOURCE_DIR = [^
]+/project/subdir2
  sub2proj_BINARY_DIR = [^
]+/project/CMP0180-OLD-build/subdir2