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<PROJECT-NAME>_IS_TOP_LEVEL
---------------------------
.. versionadded:: 3.21
A boolean variable indicating whether the named project was called in a top
level ``CMakeLists.txt`` file.
To obtain the value from the most recent call to :command:`project` in
the current directory scope or above, see the
:variable:`PROJECT_IS_TOP_LEVEL` variable.
The variable value will be true in:
* the top-level directory of the project
* the top-level directory of an external project added by :module:`ExternalProject`
The variable value will be false in:
* a directory added by :command:`add_subdirectory`
* a directory added by :module:`FetchContent`
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