cmake 判断操作系统平台

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 ()