fix(#1947): report errors for FindwxWidgets.cmake

under Unix

util/FindwxWidgets.cmake

@@ -938,24 +938,17 @@ foreach(_wx_lib_ ${wxWidgets_LIBRARIES})
         if(";${_wx_lib_name};" MATCHES "[^a-z]${_cmp}u?[^a-z]")
           set(wxWidgets_${_cmp}_FOUND FALSE)
         endif()
-      endforeach()  
+      endforeach()
     endif()
     unset(_wx_lib_found CACHE)
   endif()
 endforeach()
 
-if(_wx_lib_missing)
-  string(REPLACE ";" " " _wx_lib_missing "${_wx_lib_missing}")
-  DBG_MSG_V("wxWidgets not found due to following missing libraries: ${_wx_lib_missing}")
-  set(wxWidgets_FOUND FALSE)
-  unset(wxWidgets_LIBRARIES)
-endif()
 foreach(_cmp IN LISTS wxWidgets_FIND_COMPONENTS)
-  if(wxWidgets_FOUND AND wxWidgets_FIND_REQUIRED_${_cmp} AND NOT DEFINED wxWidgets_${_cmp}_FOUND)
+  if(wxWidgets_FIND_REQUIRED_${_cmp} AND NOT DEFINED wxWidgets_${_cmp}_FOUND)
     set(wxWidgets_${_cmp}_FOUND TRUE)
   endif()
 endforeach()
-unset(_wx_lib_missing)
 
 # Check if a specific version was requested by find_package().
 if(wxWidgets_FOUND)
@@ -981,6 +974,13 @@ if(wxWidgets_FOUND)
   dbg_msg("wxWidgets_VERSION_STRING:    ${wxWidgets_VERSION_STRING}")
 endif()
 
+if(_wx_lib_missing)
+  string(REPLACE ";" " " _wx_lib_missing "${_wx_lib_missing}")
+  DBG_MSG_V("wxWidgets not found due to following missing libraries: ${_wx_lib_missing}")
+  set(wxWidgets_FOUND FALSE)
+endif()
+unset(_wx_lib_missing)
+
 # Debug output:
 DBG_MSG("wxWidgets_FOUND           : ${wxWidgets_FOUND}")
 DBG_MSG("wxWidgets_INCLUDE_DIRS    : ${wxWidgets_INCLUDE_DIRS}")