Print Eigens target properties

CMakeLists.txt

@@ -320,6 +320,42 @@ find_package(Threads REQUIRED)
 # Eigen3 (required)
 find_package(Eigen3 3.3 REQUIRED NO_MODULE)
 
+# Get all propreties that cmake supports
+if(NOT CMAKE_PROPERTY_LIST)
+    execute_process(COMMAND cmake --help-property-list OUTPUT_VARIABLE CMAKE_PROPERTY_LIST)
+
+    # Convert command output into a CMake list
+    string(REGEX REPLACE ";" "\\\\;" CMAKE_PROPERTY_LIST "${CMAKE_PROPERTY_LIST}")
+    string(REGEX REPLACE "\n" ";" CMAKE_PROPERTY_LIST "${CMAKE_PROPERTY_LIST}")
+endif()
+
+function(print_target_properties tgt)
+    if(NOT TARGET ${tgt})
+      message("There is no target named '${tgt}'")
+      return()
+    endif()
+
+    foreach (prop ${CMAKE_PROPERTY_LIST})
+        string(REPLACE "<CONFIG>" "${CMAKE_BUILD_TYPE}" prop ${prop})
+
+        if(property STREQUAL "LOCATION" OR property MATCHES "^LOCATION_" OR property MATCHES "_LOCATION$")
+          continue()
+        endif()
+
+        get_target_property(propval ${tgt} ${prop})
+        if (propval)
+            message ("${tgt} ${prop} = ${propval}")
+        endif()
+    endforeach(prop)
+endfunction(print_target_properties)
+
+if(TARGET Eigen3::Eigen)
+  print_target_properties(Eigen3::Eigen)
+  message("Found Eigen")
+else()
+  message(WARNING "Eigen not found")
+endif()
+
 # FLANN (required)
 find_package(FLANN 1.9.1 REQUIRED)
 if(NOT (${FLANN_LIBRARY_TYPE} MATCHES ${PCL_FLANN_REQUIRED_TYPE}) AND NOT (${PCL_FLANN_REQUIRED_TYPE} MATCHES "DONTCARE"))