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CMAKE_VERSION
-------------
The CMake version string as up to four non-negative integer components
separated by ``.`` and possibly followed by ``-`` and other information.
The first three components represent the feature level and the fourth
component represents either a bug-fix level or development date.
Release versions and release candidate versions of CMake use the format::
<major>.<minor>.<patch>[.<tweak>][-rc<n>]
where the ``<tweak>`` component is less than ``20000000``. Development
versions of CMake use the format::
<major>.<minor>.<patch>.<date>[-<id>]
where the ``<date>`` component is of format ``CCYYMMDD`` and ``<id>``
may contain arbitrary text. This represents development as of a
particular date following the ``<major>.<minor>.<patch>`` feature
release.
Individual component values are also available in variables:
* :variable:`CMAKE_MAJOR_VERSION`
* :variable:`CMAKE_MINOR_VERSION`
* :variable:`CMAKE_PATCH_VERSION`
* :variable:`CMAKE_TWEAK_VERSION`
Use the :command:`if` command ``VERSION_LESS``, ``VERSION_EQUAL``, or
``VERSION_GREATER`` operators to compare version string values against
``CMAKE_VERSION`` using a component-wise test. Version component
values may be 10 or larger so do not attempt to compare version
strings as floating-point numbers.
.. note::
CMake versions prior to 2.8.2 used three components for the
feature level and had no bug-fix component. Release versions
used an even-valued second component, i.e.
``<major>.<even-minor>.<patch>[-rc<n>]``. Development versions
used an odd-valued second component with the development date as
the third component, i.e. ``<major>.<odd-minor>.<date>``.
The ``CMAKE_VERSION`` variable is defined by CMake 2.6.3 and higher.
Earlier versions defined only the individual component variables.
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