if(CMAKE_CL_64)
set(ADDRESS_MODEL 64)
set(NODE_TARGET x64)
else()
set(ADDRESS_MODEL 32)
set(NODE_TARGET x86)
endif()

看以上代码，判断下就行了

reference：

http://blog.csdn.net/wh_xiexing/article/details/18301923

cmake编译（编译目标）x86或x64