判断交叉编译：

if(CMAKE_CROSSCOMPILING)message(STATUS "Cross Comliling!!!, ARM")set(CURRENT_SYSTEM "Arm") else()message(STATUS "No Cross Comliling!!!") endif()

判断32位64位系统：

if(CMAKE_CL_64)set(CURRENT_PLATFORM "x64")message(STATUS "Current Platform is ${CURRENT_PLATFORM}") else(CMAKE_CL_64)set(CURRENT_PLATFORM "x86")message(STATUS "Current Platform is ${CURRENT_PLATFORM}") endif(CMAKE_CL_64)

判断操作系统：

if(CMAKE_SYSTEM_NAME MATCHES "Linux")set(CURRENT_SYSTEM "Linux")elseif(CMAKE_SYSTEM_NAME MATCHES "Windows")set(CURRENT_SYSTEM "Windows")elseif(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")set(CURRENT_SYSTEM "FreeBSD")endif()

代码实例

CMakeLists.txt文件节选：

message(STATUS "===============================") MESSAGE(STATUS "current operation system is ${CMAKE_SYSTEM}") message(STATUS "current operation system name is ${CMAKE_SYSTEM_NAME}")if(CMAKE_CL_64)set(CURRENT_PLATFORM "x64")message(STATUS "Current Platform is ${CURRENT_PLATFORM}") else(CMAKE_CL_64)set(CURRENT_PLATFORM "x86")message(STATUS "Current Platform is ${CURRENT_PLATFORM}") endif(CMAKE_CL_64)if(CMAKE_CROSSCOMPILING)message(STATUS "Cross Comliling!!!, ARM")set(CURRENT_SYSTEM "Arm") else()message(STATUS "No Cross Comliling!!!")#根据不同平台给CURRENT_SYSTEM命名if(CMAKE_SYSTEM_NAME MATCHES "Linux")set(CURRENT_SYSTEM "Linux")elseif(CMAKE_SYSTEM_NAME MATCHES "Windows")set(CURRENT_SYSTEM "Windows")elseif(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")set(CURRENT_SYSTEM "FreeBSD")endif()endif()

cmake打印信息(Ubuntu20系统x86测试测试)：

root@root:/home/root123/testdemo/demo1/build# cmake .. -- =============================== -- current operation system is Linux-5.11.0-41-generic -- current operation system name is Linux -- Current Platform is x86 -- No Cross Comliling!!! -- =============================== -- /home/root123/testdemo/demo1/Lib/Debug/Linux/x86 -- ===============================

总结

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