Fix hardlink materialization on Linux

Author: AnastaZIuk

cmake/NablaAssetManifestsMaterialize.cmake

@@ -16,9 +16,10 @@ function(_nam_materialize_file SOURCE_PATH DESTINATION_PATH)
     if (NOT DEFINED LINK_MODE OR "${LINK_MODE}" STREQUAL "" OR LINK_MODE STREQUAL "copy")
         file(COPY_FILE "${SOURCE_PATH}" "${DESTINATION_PATH}" ONLY_IF_DIFFERENT)
     elseif(LINK_MODE STREQUAL "hardlink")
-        file(CREATE_LINK "${SOURCE_PATH}" "${DESTINATION_PATH}" RESULT _result)
+        file(REAL_PATH "${SOURCE_PATH}" _source_for_link)
+        file(CREATE_LINK "${_source_for_link}" "${DESTINATION_PATH}" RESULT _result)
         if (_result)
-            message(FATAL_ERROR "NablaAssetManifestsMaterialize: failed to create hardlink from `${SOURCE_PATH}` to `${DESTINATION_PATH}`: ${_result}")
+            message(FATAL_ERROR "NablaAssetManifestsMaterialize: failed to create hardlink from `${_source_for_link}` to `${DESTINATION_PATH}`: ${_result}")
         endif()
     elseif(LINK_MODE STREQUAL "symlink")
         file(CREATE_LINK "${SOURCE_PATH}" "${DESTINATION_PATH}" SYMBOLIC RESULT _result)