C++学习（四零九）CMAKE_SYSTEM_NAME确定操作系统类型
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The name of the operating system for which CMake is to build. See the CMAKE_SYSTEM_VERSION variable for the OS version.
Note that CMAKE_SYSTEM_NAME is not set to anything by default when running in script mode, since it's not building anything.
System Name for Host Builds
CMAKE_SYSTEM_NAME is by default set to the same value as the CMAKE_HOST_SYSTEM_NAME variable so that the build targets the host system.
System Name for Cross Compiling
CMAKE_SYSTEM_NAME may be set explicitly when first configuring a new build tree in order to enable cross compiling. In this case the CMAKE_SYSTEM_VERSION variable must also be set explicitly.
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