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CMP0012
-------
:command:`if` recognizes numbers and boolean constants.
In CMake versions 2.6.4 and lower the :command:`if` command implicitly
dereferenced arguments corresponding to variables, even those named
like numbers or boolean constants, except for ``0`` and ``1``. Numbers and
boolean constants such as ``true``, ``false``, ``yes``, ``no``, ``on``,
``off``, ``y``, ``n``, ``notfound``, ``ignore`` (all case insensitive)
were recognized in some cases but not all. For example, the code ``if(TRUE)``
might have evaluated as ``false``.
Numbers such as 2 were recognized only in boolean expressions
like ``if(NOT 2)`` (leading to ``false``) but not as a single-argument like
``if(2)`` (also leading to ``false``). Later versions of CMake prefer to
treat numbers and boolean constants literally, so they should not be
used as variable names.
The ``OLD`` behavior for this policy is to implicitly dereference
variables named like numbers and boolean constants. The ``NEW`` behavior
for this policy is to recognize numbers and boolean constants without
dereferencing variables with such names.
This policy was introduced in CMake version 2.8.0. CMake version
|release| warns when the policy is not set and uses ``OLD`` behavior. Use
the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
.. include:: DEPRECATED.txt
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