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set(PYTHON_VENV_DIR "${PROJECT_BINARY_DIR}/venv")
set(PYTHON_VENV_TOUCHFILE "${PROJECT_BINARY_DIR}/.python-venv-built")
set(PYTHON_VENV_EXECUTABLE "${PYTHON_VENV_DIR}/bin/python")
add_custom_command(
OUTPUT ${PYTHON_VENV_TOUCHFILE}
COMMAND ${PROJECT_SOURCE_DIR}/scripts/build-python-venv.sh "${PYTHON_EXECUTABLE}" "${PROJECT_BINARY_DIR}/venv" "${PROJECT_SOURCE_DIR}" && touch "${PYTHON_VENV_TOUCHFILE}"
VERBATIM
)
# the touchfile is cleaned up by cmake automatically, we only need to remove
# the venv directory
set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${PYTHON_VENV_DIR}")
add_custom_target(BuildPyVirtualEnv
DEPENDS ${PYTHON_VENV_TOUCHFILE})
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