myx/MyxCMake/backports/TopLevelProject.cmake

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CMake
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include_guard(GLOBAL)
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if(${CMAKE_VERSION} VERSION_LESS 3.21)
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get_property(nt DIRECTORY PROPERTY PARENT_DIRECTORY)
if(NOT nt)
set(PROJECT_IS_TOP_LEVEL true)
endif()
unset(nt)
endif()