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