CMake Error at LINK_LANG_AND_ID-add_test.cmake:5 \(add_test\):
  Error evaluating generator expression:

    \$<LINK_LANG_AND_ID:CXX,GNU>

  \$<LINK_LANG_AND_ID:lang,id> may only be used with binary targets to specify
  link libraries, link directories, link options, and link depends.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)