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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