tde_create_translated_desktop: Cleaning the LINGUAS file

that is generated for merging desktop file translations
will not be performed as a POST BUILD command, but as a
separate target.

This solves premature file deletion if multiple desktop
files use a common translation folder.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 7183c21e08)

modules/TDEMacros.cmake

@@ -1540,12 +1540,21 @@ macro( tde_create_translated_desktop )
         DEPENDS ${_src}
       )
       add_custom_target( "${_out_name}-translated" ALL DEPENDS ${_out_name} )
-      add_custom_command(
-        TARGET "${_out_name}-translated"
-        POST_BUILD COMMAND ${CMAKE_COMMAND} -E remove ${_po_dir}/LINGUAS
-      )
       install( FILES ${CMAKE_CURRENT_BINARY_DIR}/${_out_name} DESTINATION ${_dest} )
 
+      # cleanup LINGUAS file
+      get_filename_component( _linguas_path "${_po_dir}/LINGUAS" ABSOLUTE )
+      file( RELATIVE_PATH _linguas_path "${CMAKE_SOURCE_DIR}" "${_linguas_path}" )
+      string( REPLACE "/" "+" _linguas_cleanup_target "${_linguas_path}" )
+      if( NOT TARGET ${_linguas_cleanup_target} )
+        add_custom_target( ${_linguas_cleanup_target} ALL
+          COMMAND ${CMAKE_COMMAND} -E remove ${_po_dir}/LINGUAS
+          COMMENT "Cleanup ${_linguas_path} file..."
+        )
+      endif( NOT TARGET ${_linguas_cleanup_target} )
+
+      add_dependencies( ${_linguas_cleanup_target} "${_out_name}-translated" )
+
     else( )
 
       # create template for intltool-merge