1IF ("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}.${CMAKE_PATCH_VERSION}" VERSION_LESS "2.8.7") 2 FUNCTION(MESSAGE_ONCE id out) 3 MESSAGE(STATUS "${out}") 4 ENDFUNCTION() 5ELSE() 6 FUNCTION(MESSAGE_ONCE id out) 7 STRING(MD5 hash "${out}") 8 IF(NOT __msg1_${id} STREQUAL "${hash}") 9 MESSAGE(STATUS "${out}") 10 ENDIF() 11 SET(__msg1_${id} ${hash} CACHE INTERNAL "") 12 ENDFUNCTION() 13ENDIF() 14 15MACRO(SET_IF_UNSET VAR VAL) 16 IF(NOT DEFINED ${VAR}) 17 SET(${VAR} ${VAL}) 18 ENDIF() 19ENDMACRO() 20