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authorKitware Robot <kwrobot@kitware.com>2013-10-15 15:17:36 (GMT)
committerBrad King <brad.king@kitware.com>2013-10-15 18:12:03 (GMT)
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+CMP0012
+-------
+
+if() recognizes numbers and boolean constants.
+
+In CMake versions 2.6.4 and lower the 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 cmake_policy command to set it to OLD or NEW explicitly.