CMake: improve output of fl_debug_target()

Todo: check "*LOCATION" properties ...

CMake/fl_debug_var.cmake

@@ -97,25 +97,36 @@ function(fl_debug_target name)
   set(var "${name}")
   fl_expand_name(var "${name}" 40)
 
-  # these properties are always supported:
-  set(_props ALIASED_TARGET TYPE)
-
-  # these properties are not supported before 3.20 for *some* target types
-  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.20)
-    list(APPEND _props
-          LOCATION
-          IMPORTED_LOCATION
-          INTERFACE_LOCATION)
+  if(NOT TARGET ${name})
+    message(STATUS "${var} = <not a target>")
+    message(STATUS "")
+    return()
   endif()
 
+  get_target_property(_type ${name} TYPE)
+  # message(STATUS "${var} = target, type = ${_type}")
+
   # these properties are always supported:
+  set(_props NAME TYPE ALIASED_TARGET)
+
+  # these properties can't be read from executable target types
+  ### if(NOT _type STREQUAL "EXECUTABLE")
+  ###   list(APPEND _props
+  ###       LOCATION
+  ###       IMPORTED_LOCATION
+  ###       INTERFACE_LOCATION)
+  ### endif()
+
   list(APPEND _props
+      INCLUDE_DIRECTORIES
+      LINK_DIRECTORIES
+      LINK_LIBRARIES
+      COMPILE_DEFINITIONS
+      INTERFACE_COMPILE_DEFINITIONS
       INTERFACE_INCLUDE_DIRECTORIES
       INTERFACE_LINK_DIRECTORIES
       INTERFACE_LINK_LIBRARIES)
 
-  if(TARGET ${name})
-    message(STATUS "${var} = <target>")
   foreach(prop ${_props})
     get_target_property(${prop} ${name} ${prop})
     if(NOT ${prop})
@@ -123,9 +134,6 @@ function(fl_debug_target name)
     endif()
     fl_debug_var(${prop})
   endforeach()
-  else()
-    message(STATUS "${var} = <not a target>")
-  endif()
   message(STATUS "")
 
 endfunction(fl_debug_target)