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- cmake_minimum_required
- ----------------------
- Set the minimum required version of cmake for a project and
- update `Policy Settings`_ to match the version given::
- cmake_minimum_required(VERSION major.minor[.patch[.tweak]]
- [FATAL_ERROR])
- If the current version of CMake is lower than that required it will
- stop processing the project and report an error.
- 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 version of CMake.
- All policies introduced in the specified version or earlier will be
- set to use NEW behavior. All policies introduced after the specified
- version 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 version higher than 2.4 is specified the command implicitly
- invokes::
- cmake_policy(VERSION major[.minor[.patch[.tweak]]])
- which sets the cmake policy version level to the version specified.
- When version 2.4 or lower is given the command implicitly invokes::
- cmake_policy(VERSION 2.4)
- which enables compatibility features for CMake 2.4 and lower.
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