Change finding of EDM4hep, ROOT and podio to use generator expressions (

#122)

* Tests: Use generator expressions to get the target locations

---------

Co-authored-by: jmcarcell <jmcarcell@users.noreply.github.com>
Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

test/k4FWCoreTest/CMakeLists.txt

@@ -42,15 +42,6 @@ include(CTest)
 
 set(K4RUN ${PROJECT_SOURCE_DIR}/k4FWCore/scripts/k4run)
 
-get_target_property(edm4hep_lib EDM4HEP::edm4hepDict LOCATION)
-get_filename_component(edm4hep_loc ${edm4hep_lib} DIRECTORY)
-
-get_target_property(root_lib ROOT::Core LOCATION)
-get_filename_component(root_loc ${root_lib} DIRECTORY)
-
-get_target_property(podio_lib podio::podio LOCATION)
-get_filename_component(podio_loc ${podio_lib} DIRECTORY)
-
 #--- The genConf directory has been renamed to genConfDir in Gaudi 35r1
 #--- See https://gitlab.cern.ch/gaudi/Gaudi/-/merge_requests/1158
 set(GAUDI_GENCONF_DIR "genConfDir")
@@ -60,8 +51,8 @@ endif()
 
 
 function(set_test_env _testname)
-  set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT "ROOT_INCLUDE_PATH=${podio_loc}/../include/podio:${edm4hep_loc}/../include:$ENV{ROOT_INCLUDE_PATH}")
-  set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT "LD_LIBRARY_PATH=${PROJECT_BINARY_DIR}:${PROJECT_BINARY_DIR}/${CMAKE_PROJECT_NAME}:${PROJECT_BINARY_DIR}/test/k4FWCoreTest:${root_loc}:${edm4hep_loc}:${podio_loc}:$ENV{LD_LIBRARY_PATH}")
+  set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT "ROOT_INCLUDE_PATH=$<$<TARGET_EXISTS:podio::podio>:$<TARGET_FILE_DIR:podio::podio>/../include>:$<$<TARGET_EXISTS:EDM4HEP::edm4hep>:$<TARGET_FILE_DIR:EDM4HEP::edm4hep>/../include>:$ENV{ROOT_INCLUDE_PATH}")
+  set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT "LD_LIBRARY_PATH=${PROJECT_BINARY_DIR}:${PROJECT_BINARY_DIR}/${CMAKE_PROJECT_NAME}:${PROJECT_BINARY_DIR}/test/k4FWCoreTest:$<$<TARGET_EXISTS:ROOT::Core>:$<TARGET_FILE_DIR:ROOT::Core>>:$<$<TARGET_EXISTS:EDM4HEP::edm4hep>:$<TARGET_FILE_DIR:EDM4HEP::edm4hep>>:$<$<TARGET_EXISTS:podio::podio>:$<TARGET_FILE_DIR:podio::podio>>:$ENV{LD_LIBRARY_PATH}")
   set_property(TEST ${_testname} APPEND PROPERTY ENVIRONMENT "PYTHONPATH=${PROJECT_BINARY_DIR}/${CMAKE_PROJECT_NAME}/${GAUDI_GENCONF_DIR}:${PROJECT_BINARY_DIR}/test/k4FWCoreTest/${GAUDI_GENCONF_DIR}:$ENV{PYTHONPATH}")
 endfunction()