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python.cmake
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python.cmake
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# Copyright 2014 Open Source Robotics Foundation, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ament_cmake needs a Python 3 interpreter
# If a specific Python version is required then find it before finding ament_cmake
# Example:
# find_package(Python3 3.8 REQUIRED)
# find_package(ament_cmake REQUIRED)
if(NOT TARGET Python3::Interpreter)
# By default, without the settings below, find_package(Python3) will attempt
# to find the newest python version it can, and additionally will find the
# most specific version. For instance, on a system that has
# /usr/bin/python3.10, /usr/bin/python3.11, and /usr/bin/python3, it will find
# /usr/bin/python3.11, even if /usr/bin/python3 points to /usr/bin/python3.10.
# The behavior we want is to prefer the "system" installed version unless the
# user specifically tells us othewise through the Python3_EXECUTABLE hint.
# Setting CMP0094 to NEW means that the search will stop after the first
# python version is found. Setting Python3_FIND_UNVERSIONED_NAMES means that
# the search will prefer /usr/bin/python3 over /usr/bin/python3.11. And that
# latter functionality is only available in CMake 3.20 or later, so we need
# at least that version.
cmake_minimum_required(VERSION 3.20)
cmake_policy(SET CMP0094 NEW)
set(Python3_FIND_UNVERSIONED_NAMES FIRST)
find_package(Python3 REQUIRED COMPONENTS Interpreter)
endif()