[CMake] add_custom_target doesn't create the rule

[hurcan solter]

I have a custom command that generates some cpp files from definitions. It
goes like that;

set (TILE_INPUTS main dngn floor wall feat player gui icons)
    foreach(tile_name ${TILE_INPUTS})
    set(tile_txt "dc-${tile_name}.txt")
    add_custom_command(
        OUTPUT "tiledef-${tile_name}.cc"
        COMMAND tilegen ${CMAKE_CURRENT_SOURCE_DIR}/rltiles/${tile_txt}
        DEPENDS ${tile_txt}
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/rltiles
        )
    list(APPEND TILEDEFINITONS "tiledef-${tile_name}.cc")

 then I create the executable;

 add_executable (crawl ${CRAWL_SOURCES} ${TILEDEFINITIONS})

 This seems like the do the trick, problem is the generated files are in a
subdirectory
 so at the compile phase it fails, I've gathered I need to add a custom
target to accomplish
that (From FAQ etc) so my CMakelists.txt look like

     set (TILE_INPUTS main dngn floor wall feat player gui icons)
    foreach(tile_name ${TILE_INPUTS})
    set(tile_txt "dc-${tile_name}.txt")
    add_custom_command(
        OUTPUT "tiledef-${tile_name}.cc"
        COMMAND tilegen ${CMAKE_CURRENT_SOURCE_DIR}/rltiles/${tile_txt}
        DEPENDS ${tile_txt}
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/rltiles
        )
    list(APPEND TILEDEFINITONS "tiledef-${tile_name}.cc")
    endforeach()
    add_custom_target(tile_target DEPENDS ${TILEDEFINITIONS})


   add_executable (crawl ${CRAWL_SOURCES})
   add_dependencies(crawl tile_target)

   I can see tile_target generated when I load the project to my ide(MSVC)
   but rule shows as empty, Do I need to add a custom target for every file
  generated ? That sounds like very tedious. or Is it entirely different
problem...

  Thanks in advance
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