always (re)create default_plugin_location.cmake - even if it already exists (#1011)

Author: rhaschke

src/rviz/default_plugin/CMakeLists.txt

@@ -80,17 +80,13 @@ install(TARGETS ${rviz_DEFAULT_PLUGIN_LIBRARY_TARGET_NAME}
   LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION})
 
 # Generate to the devel space so the extras file can include it from the devel space.
-add_custom_command(
-  OUTPUT ${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_SHARE_DESTINATION}/cmake/default_plugin_location.cmake
+add_custom_target(create_default_plugin_location_file ALL
   COMMAND
     ${CMAKE_COMMAND}
     -DPATH_TO_FILE="${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_SHARE_DESTINATION}/cmake/default_plugin_location.cmake"
     -DDEFAULT_PLUGIN_FILE_NAME=$<TARGET_FILE_NAME:${rviz_DEFAULT_PLUGIN_LIBRARY_TARGET_NAME}>
     -P ${CMAKE_CURRENT_SOURCE_DIR}/file_generate_helper.cmake
 )
-add_custom_target(create_default_plugin_location_file ALL
-  DEPENDS ${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_SHARE_DESTINATION}/cmake/default_plugin_location.cmake
-)
 # TODO(wjwwood): remove the solution above (including the file_generate_helper.cmake file) when we can
 # depend on cmake >= 2.8.12 (after dropping Saucy) and use the snippet below.
 # file(GENERATE