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cmake_minimum_required.rst
cmake_minimum_required ---------------------- Require a minimum version of cmake. .. code-block:: cmake cmake_minimum_required(VERSION <min>[...<max>] [FATAL_ERROR]) Sets the minimum required version of cmake for a project. Also updates the policy settings as explained below. ``<min>`` and the optional ``<max>`` are each CMake versions of the form ``major.minor[.patch[.tweak]]``, and the ``...`` is literal. If the running version of CMake is lower than the ``<min>`` required version it will stop processing the project and report an error. The optional ``<max>`` version, if specified, must be at least the ``<min>`` version and affects policy settings as described below. If the running version of CMake is older than 3.12, the extra ``...`` dots will be seen as version component separators, resulting in the ``...<max>`` part being ignored and preserving the pre-3.12 behavior of basing policies on ``<min>``. The ``FATAL_ERROR`` option is accepted but ignored by CMake 2.6 and higher. It should be specified so CMake versions 2.4 and lower fail with an error instead of just a warning. .. note:: Call the ``cmake_minimum_required()`` command at the beginning of the top-level ``CMakeLists.txt`` file even before calling the :command:`project` command. It is important to establish version and policy settings before invoking other commands whose behavior they may affect. See also policy :policy:`CMP0000`. Calling ``cmake_minimum_required()`` inside a :command:`function` limits some effects to the function scope when invoked. Such calls should not be made with the intention of having global effects. Policy Settings ^^^^^^^^^^^^^^^ The ``cmake_minimum_required(VERSION)`` command implicitly invokes the :command:`cmake_policy(VERSION)` command to specify that the current project code is written for the given range of CMake versions. All policies known to the running version of CMake and introduced in the ``<min>`` (or ``<max>``, if specified) version or earlier will be set to use ``NEW`` behavior. All policies introduced in later versions will be unset. This effectively requests behavior preferred as of a given CMake version and tells newer CMake versions to warn about their new policies. When a ``<min>`` version higher than 2.4 is specified the command implicitly invokes .. code-block:: cmake cmake_policy(VERSION <min>[...<max>]) which sets CMake policies based on the range of versions specified. When a ``<min>`` version 2.4 or lower is given the command implicitly invokes .. code-block:: cmake cmake_policy(VERSION 2.4[...<max>]) which enables compatibility features for CMake 2.4 and lower.