46 lines
2.0 KiB
CMake
46 lines
2.0 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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# On Windows, instruct Python to output UTF-8 even when not
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# interacting with a terminal. This is required since Python scripts
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# are invoked by CMake code and, on Windows, standard I/O encoding defaults
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# to the current code page if not connected to a terminal, which is often
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# not what we want.
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if (WIN32)
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set(ENV{PYTHONIOENCODING} "utf-8")
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endif()
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set(PYTHON_MINIMUM_REQUIRED 3.6)
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# We are using foreach here, instead of find_program(PYTHON_EXECUTABLE_SYSTEM_DEFAULT "python" "python3")
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# cause just using find_program directly could result in a python2.7 as python, and not finding a valid python3.
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foreach(PYTHON_PREFER ${PYTHON_PREFER} "python" "python3")
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find_program(PYTHON_PREFER_EXECUTABLE ${PYTHON_PREFER})
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if(PYTHON_PREFER_EXECUTABLE)
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execute_process (COMMAND "${PYTHON_PREFER_EXECUTABLE}" -c
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"import sys; sys.stdout.write('.'.join([str(x) for x in sys.version_info[:2]]))"
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RESULT_VARIABLE result
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OUTPUT_VARIABLE version
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ERROR_QUIET
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(version VERSION_LESS PYTHON_MINIMUM_REQUIRED)
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set(PYTHON_PREFER_EXECUTABLE "PYTHON_PREFER_EXECUTABLE-NOTFOUND")
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else()
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set(PYTHON_MINIMUM_REQUIRED ${version})
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set(PYTHON_EXACT EXACT)
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# Python3_ROOT_DIR ensures that location will be preferred by FindPython3.
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# On Linux, this has no impact as it will usually be /usr/bin
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# but on Windows it solve issues when both 32 and 64 bit versions are
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# installed, as version is not enough and FindPython3 might pick the
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# version not on %PATH%. Setting Python3_ROOT_DIR ensures we are using
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# the version we just tested.
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get_filename_component(PYTHON_PATH ${PYTHON_PREFER_EXECUTABLE} DIRECTORY)
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set(Python3_ROOT_DIR ${PYTHON_PATH})
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break()
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endif()
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endif()
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endforeach()
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find_package(Python3 ${PYTHON_MINIMUM_REQUIRED} REQUIRED ${PYTHON_EXACT})
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set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
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