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Diffstat (limited to 'Help/policy/CMP0012.rst')
| -rw-r--r-- | Help/policy/CMP0012.rst | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Help/policy/CMP0012.rst b/Help/policy/CMP0012.rst new file mode 100644 index 0000000..7a749bf --- /dev/null +++ b/Help/policy/CMP0012.rst @@ -0,0 +1,25 @@ +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. |