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variable_watch
--------------
Watch the CMake variable for change.
.. code-block:: cmake
variable_watch(<variable> [<command>])
If the specified ``<variable>`` changes, a message will be printed
to inform about the change.
Additionally, if ``<command>`` is given, this command will be executed.
The command will receive the following arguments:
``COMMAND(<variable> <access> <value> <current_list_file> <stack>)``
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