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# If the cmake variable "PYTHON_DEVELOPMENT_REQUIRED" is set to ON
# then the development environments are found.
# CMake will use FindPython3 and can be controlled accordingly (i.e. setting Python3_ROOT_DIR or
# Python3_FIND_REGISTRY (useful if using PATH to specify Python3 version on Windows).
# Additionally, setting Python3_EXECUTABLE can be used to set the Python version explicitly, but
# may become less reliable with newer versions of CMake (as opposed setting FindPython3 HINTS). Current
# implementation gives preference to active virtualenvs.
cmake_policy(SET CMP0094 NEW) # makes FindPython3 prefer activated virtualenv Python to latest version
set(PYTHON_REQUIRED_VERSION 3.8)
set(Python_ADDITIONAL_VERSIONS
3.12
3.11
3.10
3.9
3.8)
if(PYTHON_DEVELOPMENT_REQUIRED)
if(DEFINED Python3_EXECUTABLE) # if already specified
set(_specified_Python3_EXECUTABLE ${Python3_EXECUTABLE})
endif()
# set(Python3_FIND_REGISTRY LAST) # default is FIRST. Do we need/want this?
find_package(Python3 ${PYTHON_REQUIRED_VERSION} COMPONENTS Interpreter Development.Module ${SKBUILD_SABI_COMPONENT})
if(DEFINED _specified_Python3_EXECUTABLE)
set(Python3_EXECUTABLE
${_specified_Python3_EXECUTABLE}
CACHE INTERNAL "Path to the Python interpreter" FORCE)
endif()
else() # if not PYTHON_DEVELOPMENT_REQUIRED, just find some version of Python (don't need to be as specific)
find_package(Python3 ${PYTHON_REQUIRED_VERSION} COMPONENTS Interpreter)
endif()
if(ITK_WRAP_PYTHON)
set(ITK_WRAP_PYTHON_VERSION "${Python3_VERSION}")
else()
set(ITK_WRAP_PYTHON_VERSION "ITK_WRAP_PYTHON=OFF")
endif()
if(NOT Python3_EXECUTABLE AND _specified_Python3_EXECUTABLE
)# workaround for cases where FindPython3 fails to set correctly
set(Python3_EXECUTABLE
${_specified_Python3_EXECUTABLE}
CACHE INTERNAL "Path to the Python interpreter" FORCE)
endif()
# Add user-visible cache entry
set(Python3_ROOT_DIR
${Python3_ROOT_DIR}
CACHE PATH "Which installation or virtual environment of Python to use" FORCE)
mark_as_advanced(Python3_ROOT_DIR)
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