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47 lines
1.5 KiB
47 lines
1.5 KiB
unset
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-----
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Unset a variable, cache variable, or environment variable.
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Unset Normal Variable or Cache Entry
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: cmake
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unset(<variable> [CACHE | PARENT_SCOPE])
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Removes a normal variable from the current scope, causing it
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to become undefined. If ``CACHE`` is present, then a cache variable
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is removed instead of a normal variable. Note that when evaluating
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:ref:`Variable References` of the form ``${VAR}``, CMake first searches
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for a normal variable with that name. If no such normal variable exists,
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CMake will then search for a cache entry with that name. Because of this
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unsetting a normal variable can expose a cache variable that was previously
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hidden. To force a variable reference of the form ``${VAR}`` to return an
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empty string, use ``set(<variable> "")``, which clears the normal variable
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but leaves it defined.
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If ``PARENT_SCOPE`` is present then the variable is removed from the scope
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above the current scope. See the same option in the :command:`set` command
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for further details.
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Unset Environment Variable
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: cmake
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unset(ENV{<variable>})
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Removes ``<variable>`` from the currently available
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:manual:`Environment Variables <cmake-env-variables(7)>`.
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Subsequent calls of ``$ENV{<variable>}`` will return the empty string.
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This command affects only the current CMake process, not the process
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from which CMake was called, nor the system environment at large,
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nor the environment of subsequent build or test processes.
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See Also
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^^^^^^^^
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* :command:`set`
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