CMake Error at TARGET_LINKER_IMPORT_FILE-non-valid-target.cmake:[0-9]+ \(file\):
  Error evaluating generator expression:

    \$<TARGET_LINKER_IMPORT_FILE:exe1>

  TARGET_LINKER_IMPORT_FILE is allowed only for libraries and executables
  with ENABLE_EXPORTS.
Call Stack \(most recent call first\):
  CMakeLists.txt:[0-9]+ \(include\)