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fix(cmake): correctly detect FindPython policy and better warning (#4806)
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@ -5,6 +5,11 @@
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# All rights reserved. Use of this source code is governed by a
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# All rights reserved. Use of this source code is governed by a
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# BSD-style license that can be found in the LICENSE file.
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# BSD-style license that can be found in the LICENSE file.
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# Propagate this policy (FindPythonInterp removal) so it can be detected later
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if(NOT CMAKE_VERSION VERSION_LESS "3.27")
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cmake_policy(GET CMP0148 _pybind11_cmp0148)
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endif()
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cmake_minimum_required(VERSION 3.5)
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cmake_minimum_required(VERSION 3.5)
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# The `cmake_minimum_required(VERSION 3.5...3.26)` syntax does not work with
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# The `cmake_minimum_required(VERSION 3.5...3.26)` syntax does not work with
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@ -16,6 +21,11 @@ else()
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cmake_policy(VERSION 3.26)
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cmake_policy(VERSION 3.26)
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endif()
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endif()
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if(_pybind11_cmp0148)
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cmake_policy(SET CMP0148 ${_pybind11_cmp0148})
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unset(_pybind11_cmp0148)
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endif()
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# Avoid infinite recursion if tests include this as a subdirectory
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# Avoid infinite recursion if tests include this as a subdirectory
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if(DEFINED PYBIND11_MASTER_PROJECT)
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if(DEFINED PYBIND11_MASTER_PROJECT)
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return()
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return()
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@ -95,6 +95,22 @@ if(NOT PythonLibsNew_FIND_VERSION)
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set(PythonLibsNew_FIND_VERSION "3.6")
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set(PythonLibsNew_FIND_VERSION "3.6")
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endif()
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endif()
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if(NOT CMAKE_VERSION VERSION_LESS "3.27")
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cmake_policy(GET CMP0148 _pybind11_cmp0148)
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if(NOT _pybind11_cmp0148)
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message(
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AUTHOR_WARNING
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"Policy CMP0148 is not set: The FindPythonInterp and FindPythonLibs "
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"modules are removed. Run \"cmake --help-policy CMP0148\" for policy "
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"details. Use the cmake_policy command to set the policy and suppress "
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"this warning, or preferably upgrade to using FindPython, either by "
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"calling it explicitly before pybind11, or by setting "
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"PYBIND11_FINDPYTHON ON before pybind11.")
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endif()
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cmake_policy(SET CMP0148 OLD)
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unset(_pybind11_cmp0148)
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endif()
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find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} ${_pythonlibs_required}
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find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} ${_pythonlibs_required}
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${_pythonlibs_quiet})
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${_pythonlibs_quiet})
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