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581 lines
20 KiB
CMake
581 lines
20 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindPython
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----------
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.. versionadded:: 3.12
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Find Python interpreter, compiler and development environment (include
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directories and libraries).
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.. versionadded:: 3.19
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When a version is requested, it can be specified as a simple value or as a
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range. For a detailed description of version range usage and capabilities,
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refer to the :command:`find_package` command.
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The following components are supported:
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* ``Interpreter``: search for Python interpreter.
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* ``Compiler``: search for Python compiler. Only offered by IronPython.
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* ``Development``: search for development artifacts (include directories and
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libraries).
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.. versionadded:: 3.18
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This component includes two sub-components which can be specified
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independently:
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* ``Development.Module``: search for artifacts for Python module
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developments.
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* ``Development.Embed``: search for artifacts for Python embedding
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developments.
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* ``NumPy``: search for NumPy include directories.
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.. versionadded:: 3.14
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Added the ``NumPy`` component.
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If no ``COMPONENTS`` are specified, ``Interpreter`` is assumed.
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If component ``Development`` is specified, it implies sub-components
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``Development.Module`` and ``Development.Embed``.
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To ensure consistent versions between components ``Interpreter``, ``Compiler``,
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``Development`` (or one of its sub-components) and ``NumPy``, specify all
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components at the same time::
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find_package (Python COMPONENTS Interpreter Development)
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This module looks preferably for version 3 of Python. If not found, version 2
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is searched.
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To manage concurrent versions 3 and 2 of Python, use :module:`FindPython3` and
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:module:`FindPython2` modules rather than this one.
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.. note::
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If components ``Interpreter`` and ``Development`` (or one of its
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sub-components) are both specified, this module search only for interpreter
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with same platform architecture as the one defined by ``CMake``
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configuration. This constraint does not apply if only ``Interpreter``
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component is specified.
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Imported Targets
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^^^^^^^^^^^^^^^^
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This module defines the following :ref:`Imported Targets <Imported Targets>`:
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.. versionchanged:: 3.14
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:ref:`Imported Targets <Imported Targets>` are only created when
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:prop_gbl:`CMAKE_ROLE` is ``PROJECT``.
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``Python::Interpreter``
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Python interpreter. Target defined if component ``Interpreter`` is found.
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``Python::Compiler``
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Python compiler. Target defined if component ``Compiler`` is found.
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``Python::Module``
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.. versionadded:: 3.15
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Python library for Python module. Target defined if component
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``Development.Module`` is found.
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``Python::Python``
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Python library for Python embedding. Target defined if component
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``Development.Embed`` is found.
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``Python::NumPy``
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.. versionadded:: 3.14
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NumPy Python library. Target defined if component ``NumPy`` is found.
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Result Variables
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^^^^^^^^^^^^^^^^
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This module will set the following variables in your project
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(see :ref:`Standard Variable Names <CMake Developer Standard Variable Names>`):
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``Python_FOUND``
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System has the Python requested components.
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``Python_Interpreter_FOUND``
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System has the Python interpreter.
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``Python_EXECUTABLE``
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Path to the Python interpreter.
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``Python_INTERPRETER_ID``
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A short string unique to the interpreter. Possible values include:
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* Python
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* ActivePython
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* Anaconda
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* Canopy
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* IronPython
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* PyPy
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``Python_STDLIB``
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Standard platform independent installation directory.
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Information returned by
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``distutils.sysconfig.get_python_lib(plat_specific=False,standard_lib=True)``
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or else ``sysconfig.get_path('stdlib')``.
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``Python_STDARCH``
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Standard platform dependent installation directory.
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Information returned by
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``distutils.sysconfig.get_python_lib(plat_specific=True,standard_lib=True)``
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or else ``sysconfig.get_path('platstdlib')``.
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``Python_SITELIB``
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Third-party platform independent installation directory.
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Information returned by
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``distutils.sysconfig.get_python_lib(plat_specific=False,standard_lib=False)``
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or else ``sysconfig.get_path('purelib')``.
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``Python_SITEARCH``
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Third-party platform dependent installation directory.
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Information returned by
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``distutils.sysconfig.get_python_lib(plat_specific=True,standard_lib=False)``
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or else ``sysconfig.get_path('platlib')``.
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``Python_SOABI``
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.. versionadded:: 3.17
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Extension suffix for modules.
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Information returned by
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``distutils.sysconfig.get_config_var('SOABI')`` or computed from
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``distutils.sysconfig.get_config_var('EXT_SUFFIX')`` or
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``python-config --extension-suffix``. If package ``distutils.sysconfig`` is
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not available, ``sysconfig.get_config_var('SOABI')`` or
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``sysconfig.get_config_var('EXT_SUFFIX')`` are used.
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``Python_Compiler_FOUND``
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System has the Python compiler.
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``Python_COMPILER``
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Path to the Python compiler. Only offered by IronPython.
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``Python_COMPILER_ID``
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A short string unique to the compiler. Possible values include:
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* IronPython
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``Python_DOTNET_LAUNCHER``
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.. versionadded:: 3.18
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The ``.Net`` interpreter. Only used by ``IronPython`` implementation.
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``Python_Development_FOUND``
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System has the Python development artifacts.
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``Python_Development.Module_FOUND``
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.. versionadded:: 3.18
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System has the Python development artifacts for Python module.
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``Python_Development.Embed_FOUND``
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.. versionadded:: 3.18
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System has the Python development artifacts for Python embedding.
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``Python_INCLUDE_DIRS``
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The Python include directories.
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``Python_LINK_OPTIONS``
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.. versionadded:: 3.19
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The Python link options. Some configurations require specific link options
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for a correct build and execution.
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``Python_LIBRARIES``
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The Python libraries.
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``Python_LIBRARY_DIRS``
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The Python library directories.
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``Python_RUNTIME_LIBRARY_DIRS``
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The Python runtime library directories.
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``Python_VERSION``
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Python version.
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``Python_VERSION_MAJOR``
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Python major version.
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``Python_VERSION_MINOR``
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Python minor version.
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``Python_VERSION_PATCH``
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Python patch version.
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``Python_PyPy_VERSION``
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.. versionadded:: 3.18
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Python PyPy version.
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``Python_NumPy_FOUND``
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.. versionadded:: 3.14
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System has the NumPy.
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``Python_NumPy_INCLUDE_DIRS``
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.. versionadded:: 3.14
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The NumPy include directories.
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``Python_NumPy_VERSION``
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.. versionadded:: 3.14
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The NumPy version.
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Hints
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^^^^^
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``Python_ROOT_DIR``
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Define the root directory of a Python installation.
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``Python_USE_STATIC_LIBS``
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* If not defined, search for shared libraries and static libraries in that
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order.
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* If set to TRUE, search **only** for static libraries.
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* If set to FALSE, search **only** for shared libraries.
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``Python_FIND_ABI``
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.. versionadded:: 3.16
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This variable defines which ABIs, as defined in
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`PEP 3149 <https://www.python.org/dev/peps/pep-3149/>`_, should be searched.
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.. note::
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This hint will be honored only when searched for ``Python`` version 3.
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.. note::
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If ``Python_FIND_ABI`` is not defined, any ABI will be searched.
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The ``Python_FIND_ABI`` variable is a 3-tuple specifying, in that order,
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``pydebug`` (``d``), ``pymalloc`` (``m``) and ``unicode`` (``u``) flags.
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Each element can be set to one of the following:
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* ``ON``: Corresponding flag is selected.
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* ``OFF``: Corresponding flag is not selected.
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* ``ANY``: The two possibilities (``ON`` and ``OFF``) will be searched.
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From this 3-tuple, various ABIs will be searched starting from the most
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specialized to the most general. Moreover, ``debug`` versions will be
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searched **after** ``non-debug`` ones.
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For example, if we have::
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set (Python_FIND_ABI "ON" "ANY" "ANY")
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The following flags combinations will be appended, in that order, to the
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artifact names: ``dmu``, ``dm``, ``du``, and ``d``.
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And to search any possible ABIs::
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set (Python_FIND_ABI "ANY" "ANY" "ANY")
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The following combinations, in that order, will be used: ``mu``, ``m``,
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``u``, ``<empty>``, ``dmu``, ``dm``, ``du`` and ``d``.
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.. note::
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This hint is useful only on ``POSIX`` systems. So, on ``Windows`` systems,
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when ``Python_FIND_ABI`` is defined, ``Python`` distributions from
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`python.org <https://www.python.org/>`_ will be found only if value for
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each flag is ``OFF`` or ``ANY``.
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``Python_FIND_STRATEGY``
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.. versionadded:: 3.15
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This variable defines how lookup will be done.
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The ``Python_FIND_STRATEGY`` variable can be set to one of the following:
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* ``VERSION``: Try to find the most recent version in all specified
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locations.
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This is the default if policy :policy:`CMP0094` is undefined or set to
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``OLD``.
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* ``LOCATION``: Stops lookup as soon as a version satisfying version
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constraints is founded.
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This is the default if policy :policy:`CMP0094` is set to ``NEW``.
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``Python_FIND_REGISTRY``
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.. versionadded:: 3.13
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On Windows the ``Python_FIND_REGISTRY`` variable determine the order
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of preference between registry and environment variables.
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the ``Python_FIND_REGISTRY`` variable can be set to one of the following:
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* ``FIRST``: Try to use registry before environment variables.
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This is the default.
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* ``LAST``: Try to use registry after environment variables.
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* ``NEVER``: Never try to use registry.
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``Python_FIND_FRAMEWORK``
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.. versionadded:: 3.15
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On macOS the ``Python_FIND_FRAMEWORK`` variable determine the order of
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preference between Apple-style and unix-style package components.
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This variable can take same values as :variable:`CMAKE_FIND_FRAMEWORK`
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variable.
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.. note::
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Value ``ONLY`` is not supported so ``FIRST`` will be used instead.
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If ``Python_FIND_FRAMEWORK`` is not defined, :variable:`CMAKE_FIND_FRAMEWORK`
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variable will be used, if any.
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``Python_FIND_VIRTUALENV``
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.. versionadded:: 3.15
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This variable defines the handling of virtual environments managed by
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``virtualenv`` or ``conda``. It is meaningful only when a virtual environment
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is active (i.e. the ``activate`` script has been evaluated). In this case, it
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takes precedence over ``Python_FIND_REGISTRY`` and ``CMAKE_FIND_FRAMEWORK``
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variables. The ``Python_FIND_VIRTUALENV`` variable can be set to one of the
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following:
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* ``FIRST``: The virtual environment is used before any other standard
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paths to look-up for the interpreter. This is the default.
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* ``ONLY``: Only the virtual environment is used to look-up for the
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interpreter.
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* ``STANDARD``: The virtual environment is not used to look-up for the
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interpreter but environment variable ``PATH`` is always considered.
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In this case, variable ``Python_FIND_REGISTRY`` (Windows) or
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``CMAKE_FIND_FRAMEWORK`` (macOS) can be set with value ``LAST`` or
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``NEVER`` to select preferably the interpreter from the virtual
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environment.
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.. versionadded:: 3.17
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Added support for ``conda`` environments.
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.. note::
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If the component ``Development`` is requested, it is **strongly**
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recommended to also include the component ``Interpreter`` to get expected
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result.
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``Python_FIND_IMPLEMENTATIONS``
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.. versionadded:: 3.18
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This variable defines, in an ordered list, the different implementations
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which will be searched. The ``Python_FIND_IMPLEMENTATIONS`` variable can
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hold the following values:
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* ``CPython``: this is the standard implementation. Various products, like
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``Anaconda`` or ``ActivePython``, rely on this implementation.
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* ``IronPython``: This implementation use the ``CSharp`` language for
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``.NET Framework`` on top of the `Dynamic Language Runtime` (``DLR``).
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See `IronPython <http://ironpython.net>`_.
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* ``PyPy``: This implementation use ``RPython`` language and
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``RPython translation toolchain`` to produce the python interpreter.
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See `PyPy <https://www.pypy.org>`_.
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The default value is:
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* Windows platform: ``CPython``, ``IronPython``
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* Other platforms: ``CPython``
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.. note::
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This hint has the lowest priority of all hints, so even if, for example,
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you specify ``IronPython`` first and ``CPython`` in second, a python
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product based on ``CPython`` can be selected because, for example with
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``Python_FIND_STRATEGY=LOCATION``, each location will be search first for
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``IronPython`` and second for ``CPython``.
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.. note::
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When ``IronPython`` is specified, on platforms other than ``Windows``, the
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``.Net`` interpreter (i.e. ``mono`` command) is expected to be available
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through the ``PATH`` variable.
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``Python_FIND_UNVERSIONED_NAMES``
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.. versionadded:: 3.20
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This variable defines how the generic names will be searched. Currently, it
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only applies to the generic names of the interpreter, namely, ``python3`` or
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``python2`` and ``python``.
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The ``Python_FIND_UNVERSIONED_NAMES`` variable can be set to one of the
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following values:
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* ``FIRST``: The generic names are searched before the more specialized ones
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(such as ``python2.5`` for example).
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* ``LAST``: The generic names are searched after the more specialized ones.
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This is the default.
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* ``NEVER``: The generic name are not searched at all.
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Artifacts Specification
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^^^^^^^^^^^^^^^^^^^^^^^
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.. versionadded:: 3.16
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To solve special cases, it is possible to specify directly the artifacts by
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setting the following variables:
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``Python_EXECUTABLE``
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The path to the interpreter.
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``Python_COMPILER``
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The path to the compiler.
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``Python_DOTNET_LAUNCHER``
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.. versionadded:: 3.18
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The ``.Net`` interpreter. Only used by ``IronPython`` implementation.
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``Python_LIBRARY``
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The path to the library. It will be used to compute the
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variables ``Python_LIBRARIES``, ``Python_LIBRARY_DIRS`` and
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``Python_RUNTIME_LIBRARY_DIRS``.
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``Python_INCLUDE_DIR``
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The path to the directory of the ``Python`` headers. It will be used to
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compute the variable ``Python_INCLUDE_DIRS``.
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``Python_NumPy_INCLUDE_DIR``
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The path to the directory of the ``NumPy`` headers. It will be used to
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compute the variable ``Python_NumPy_INCLUDE_DIRS``.
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.. note::
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All paths must be absolute. Any artifact specified with a relative path
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will be ignored.
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.. note::
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When an artifact is specified, all ``HINTS`` will be ignored and no search
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will be performed for this artifact.
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If more than one artifact is specified, it is the user's responsibility to
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ensure the consistency of the various artifacts.
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By default, this module supports multiple calls in different directories of a
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project with different version/component requirements while providing correct
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and consistent results for each call. To support this behavior, ``CMake`` cache
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is not used in the traditional way which can be problematic for interactive
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specification. So, to enable also interactive specification, module behavior
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can be controlled with the following variable:
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``Python_ARTIFACTS_INTERACTIVE``
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.. versionadded:: 3.18
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Selects the behavior of the module. This is a boolean variable:
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* If set to ``TRUE``: Create CMake cache entries for the above artifact
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specification variables so that users can edit them interactively.
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This disables support for multiple version/component requirements.
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* If set to ``FALSE`` or undefined: Enable multiple version/component
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requirements.
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Commands
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^^^^^^^^
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This module defines the command ``Python_add_library`` (when
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:prop_gbl:`CMAKE_ROLE` is ``PROJECT``), which has the same semantics as
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:command:`add_library` and adds a dependency to target ``Python::Python`` or,
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when library type is ``MODULE``, to target ``Python::Module`` and takes care of
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Python module naming rules::
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Python_add_library (<name> [STATIC | SHARED | MODULE [WITH_SOABI]]
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<source1> [<source2> ...])
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If the library type is not specified, ``MODULE`` is assumed.
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.. versionadded:: 3.17
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For ``MODULE`` library type, if option ``WITH_SOABI`` is specified, the
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module suffix will include the ``Python_SOABI`` value, if any.
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#]=======================================================================]
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cmake_policy(PUSH)
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# numbers and boolean constants
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cmake_policy (SET CMP0012 NEW)
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set (_PYTHON_PREFIX Python)
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unset (_Python_REQUIRED_VERSION_MAJOR)
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unset (_Python_REQUIRED_VERSIONS)
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if (Python_FIND_VERSION_RANGE)
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# compute list of major versions
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foreach (_Python_MAJOR IN ITEMS 3 2)
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if (_Python_MAJOR VERSION_GREATER_EQUAL Python_FIND_VERSION_MIN_MAJOR
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AND ((Python_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE" AND _Python_MAJOR VERSION_LESS_EQUAL Python_FIND_VERSION_MAX)
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OR (Python_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE" AND _Python_MAJOR VERSION_LESS Python_FIND_VERSION_MAX)))
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list (APPEND _Python_REQUIRED_VERSIONS ${_Python_MAJOR})
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endif()
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endforeach()
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list (LENGTH _Python_REQUIRED_VERSIONS _Python_VERSION_COUNT)
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if (_Python_VERSION_COUNT EQUAL 0)
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unset (_Python_REQUIRED_VERSIONS)
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elseif (_Python_VERSION_COUNT EQUAL 1)
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set (_Python_REQUIRED_VERSION_MAJOR ${_Python_REQUIRED_VERSIONS})
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endif()
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elseif (DEFINED Python_FIND_VERSION)
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set (_Python_REQUIRED_VERSION_MAJOR ${Python_FIND_VERSION_MAJOR})
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else()
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set (_Python_REQUIRED_VERSIONS 3 2)
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endif()
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if (_Python_REQUIRED_VERSION_MAJOR)
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include (${CMAKE_CURRENT_LIST_DIR}/FindPython/Support.cmake)
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elseif (_Python_REQUIRED_VERSIONS)
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# iterate over versions in quiet and NOT required modes to avoid multiple
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|
# "Found" messages and prematurally failure.
|
|
set (_Python_QUIETLY ${Python_FIND_QUIETLY})
|
|
set (_Python_REQUIRED ${Python_FIND_REQUIRED})
|
|
set (Python_FIND_QUIETLY TRUE)
|
|
set (Python_FIND_REQUIRED FALSE)
|
|
|
|
set (_Python_REQUIRED_VERSION_LAST 2)
|
|
|
|
unset (_Python_INPUT_VARS)
|
|
foreach (_Python_ITEM IN ITEMS Python_EXECUTABLE Python_COMPILER Python_LIBRARY
|
|
Python_INCLUDE_DIR Python_NumPy_INCLUDE_DIR)
|
|
if (NOT DEFINED ${_Python_ITEM})
|
|
list (APPEND _Python_INPUT_VARS ${_Python_ITEM})
|
|
endif()
|
|
endforeach()
|
|
|
|
foreach (_Python_REQUIRED_VERSION_MAJOR IN LISTS _Python_REQUIRED_VERSIONS)
|
|
set (Python_FIND_VERSION ${_Python_REQUIRED_VERSION_MAJOR})
|
|
include (${CMAKE_CURRENT_LIST_DIR}/FindPython/Support.cmake)
|
|
if (Python_FOUND OR
|
|
_Python_REQUIRED_VERSION_MAJOR EQUAL _Python_REQUIRED_VERSION_LAST)
|
|
break()
|
|
endif()
|
|
# clean-up INPUT variables not set by the user
|
|
foreach (_Python_ITEM IN LISTS _Python_INPUT_VARS)
|
|
unset (${_Python_ITEM})
|
|
endforeach()
|
|
# clean-up some CACHE variables to ensure look-up restart from scratch
|
|
foreach (_Python_ITEM IN LISTS _Python_CACHED_VARS)
|
|
unset (${_Python_ITEM} CACHE)
|
|
endforeach()
|
|
endforeach()
|
|
|
|
unset (Python_FIND_VERSION)
|
|
|
|
set (Python_FIND_QUIETLY ${_Python_QUIETLY})
|
|
set (Python_FIND_REQUIRED ${_Python_REQUIRED})
|
|
if (Python_FIND_REQUIRED OR NOT Python_FIND_QUIETLY)
|
|
# call again validation command to get "Found" or error message
|
|
find_package_handle_standard_args (Python HANDLE_COMPONENTS HANDLE_VERSION_RANGE
|
|
REQUIRED_VARS ${_Python_REQUIRED_VARS}
|
|
VERSION_VAR Python_VERSION)
|
|
endif()
|
|
else()
|
|
# supported versions not in the specified range. Call final check
|
|
if (NOT Python_FIND_COMPONENTS)
|
|
set (Python_FIND_COMPONENTS Interpreter)
|
|
set (Python_FIND_REQUIRED_Interpreter TRUE)
|
|
endif()
|
|
|
|
include (${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
|
|
find_package_handle_standard_args (Python HANDLE_COMPONENTS HANDLE_VERSION_RANGE
|
|
VERSION_VAR Python_VERSION
|
|
REASON_FAILURE_MESSAGE "Version range specified \"${Python_FIND_VERSION_RANGE}\" does not include supported versions")
|
|
endif()
|
|
|
|
if (COMMAND __Python_add_library)
|
|
macro (Python_add_library)
|
|
__Python_add_library (Python ${ARGV})
|
|
endmacro()
|
|
endif()
|
|
|
|
unset (_PYTHON_PREFIX)
|
|
|
|
cmake_policy(POP)
|