cmake_minimum_required(VERSION 2.8)

project(testoptargmacro)

macro(testmacro testarg1 testarg3)
  message(STATUS "testarg1 = \"${testarg1}\"")
  message(STATUS "testarg1 = \"${testarg2}\"")
  message(STATUS "Optional arg = \"${ARGV2}\"")
  
  if(${ARGV2})
    message(STATUS "Optional arg from if = \"${ARGV2}\"")
  endif()
endmacro(testmacro)

testmacro("pipo1" "pipo2")
testmacro("pipo3" "pipo4" "pipo5")