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camke中判断操作系统平台有两种方法：

1.

MESSAGE(STATUS "operation system is ${CMAKE_SYSTEM}") IF (CMAKE_SYSTEM_NAME MATCHES "Linux")	MESSAGE(STATUS "current platform: Linux ")ELSEIF (CMAKE_SYSTEM_NAME MATCHES "Windows")	MESSAGE(STATUS "current platform: Windows")ELSEIF (CMAKE_SYSTEM_NAME MATCHES "FreeBSD")	MESSAGE(STATUS "current platform: FreeBSD")ELSE ()	MESSAGE(STATUS "other platform: ${CMAKE_SYSTEM_NAME}")ENDIF (CMAKE_SYSTEM_NAME MATCHES "Linux") MESSAGE(STSTUS "###################################")

2.

IF (WIN32)	MESSAGE(STATUS "Now is windows")ELSEIF (APPLE)	MESSAGE(STATUS "Now is Apple systens.")ELSEIF (UNIX)	MESSAGE(STATUS "Now is UNIX-like OS's.")ENDIF ()

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