cmake跨平台编译之判断操作系统平台、32位64位系统

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
-- ===============================