CMake Error at no-fileset\.cmake:[0-9]+ \(file\):
  Error evaluating generator expression:

    \$<FILE_SET_PROPERTY:,TARGET:foo,FOO>

  \$<FILE_SET_PROPERTY:fileset,TARGET:tgt,prop> expression requires a
  non-empty FILE_SET name.
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)
