| 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. |
