CMake Error at SOURCE_FILES-not-in-target\.cmake:[0-9]+ \(add_custom_target\):
  Error evaluating generator expression:

    \$<TARGET_OBJECTS:c_objs,SOURCE_FILES:[^
]*/Tests/RunCMake/GenEx-TARGET_OBJECTS/empty3\.c>

  Source file:

    [^
]*/Tests/RunCMake/GenEx-TARGET_OBJECTS/empty3\.c

  does not exist for target "c_objs"
