avoid using ARGN for efficiency

cmake/catkin_libraries.cmake

@@ -78,7 +78,7 @@ macro(catkin_pack_libraries_with_build_configuration VAR)
     if("${lib}" MATCHES "^debug|optimized|general$")
       math(EXPR _index "${_index} + 1")
       if(${_index} EQUAL ${_count})
-        message(FATAL_ERROR "catkin_pack_libraries_with_build_configuration() the list of libraries '${ARGN}' ends with '${lib}' which is a build configuration keyword and must be followed by a library")
+        message(FATAL_ERROR "catkin_pack_libraries_with_build_configuration() the list of libraries '${_argn}' ends with '${lib}' which is a build configuration keyword and must be followed by a library")
       endif()
       list(GET _argn ${_index} library)
       list(APPEND ${VAR} "${lib}${CATKIN_BUILD_CONFIGURATION_KEYWORD_SEPARATOR}${library}")
@@ -87,7 +87,7 @@ macro(catkin_pack_libraries_with_build_configuration VAR)
     endif()
     math(EXPR _index "${_index} + 1")
   endwhile()
-  debug_message(10 "catkin_pack_libraries_with_build_configuration(${VAR} ${ARGN}) ${${VAR}}")
+  #debug_message(10 "catkin_pack_libraries_with_build_configuration(${VAR} ${_argn}) ${${VAR}}")
 endmacro()
 
 #
@@ -107,7 +107,8 @@ macro(catkin_unpack_libraries_with_build_configuration VAR)
     string(REGEX REPLACE "^(debug|optimized|general)${CATKIN_BUILD_CONFIGURATION_KEYWORD_SEPARATOR}(.+)$" "\\1;\\2" lib "${lib}")
     list(APPEND ${VAR} "${lib}")
   endforeach()
-  debug_message(10 "catkin_unpack_libraries_with_build_configuration(${VAR} ${ARGN}) ${${VAR}}")
+  #set(_argn ${ARGN})
+  #debug_message(10 "catkin_unpack_libraries_with_build_configuration(${VAR} ${_argn}) ${${VAR}}")
 endmacro()
 
 #
@@ -153,5 +154,6 @@ macro(catkin_replace_imported_library_targets VAR)
       list(APPEND ${VAR} "${lib}")
     endif()
   endforeach()
-  debug_message(10 "catkin_replace_imported_library_targets(${VAR} ${ARGN}) ${${VAR}}")
+  #set(_argn ${ARGN})
+  #debug_message(10 "catkin_replace_imported_library_targets(${VAR} ${_argn}) ${${VAR}}")
 endmacro()