You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
1.2 KiB
29 lines
1.2 KiB
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.
|
|
|
|
.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 2.8.0
|
|
.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
|
|
.. include:: STANDARD_ADVICE.txt
|
|
|
|
.. include:: DEPRECATED.txt
|