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# Macros and functions related to detecting details of the Python environment.
set(MLIR_MINIMUM_PYTHON_VERSION 3.10)
# Finds and configures python packages needed to build MLIR Python bindings.
macro(mlir_configure_python_dev_packages)
if(NOT MLIR_DISABLE_CONFIGURE_PYTHON_DEV_PACKAGES)
if(MLIR_DETECT_PYTHON_ENV_PRIME_SEARCH)
# Prime the search for python to see if there is a full development
# package. This seems to work around cmake bugs searching only for
# Development.Module in some environments. However, in other environments
# it may interfere with the subsequent search for Development.Module.
find_package(Python3 ${MLIR_MINIMUM_PYTHON_VERSION}
COMPONENTS Interpreter Development)
endif()
# After CMake 3.18, we are able to limit the scope of the search to just
# Development.Module. Searching for Development will fail in situations where
# the Python libraries are not available. When possible, limit to just
# Development.Module.
# See https://pybind11.readthedocs.io/en/stable/compiling.html#findpython-mode
set(_python_development_component Development.Module)
find_package(Python3 ${MLIR_MINIMUM_PYTHON_VERSION}
COMPONENTS Interpreter ${_python_development_component} REQUIRED)
# We look for both Python3 and Python, the search algorithm should be
# consistent, otherwise disastrous result is almost guaranteed.
# Warn if the policies for treating virtual environment are not defined
# consistently.
# For more details check issue #126162.
if(((DEFINED Python_FIND_VIRTUALENV) AND (NOT DEFINED Python3_FIND_VIRTUALENV)) OR
((NOT DEFINED Python_FIND_VIRTUALENV) AND (DEFINED Python3_FIND_VIRTUALENV)))
message(WARNING "Only one of Python3_FIND_VIRTUALENV and Python_FIND_VIRTUALENV variables is defined. "
"Make sure that both variables are defined and have the same value.")
elseif((DEFINED Python_FIND_VIRTUALENV) AND (DEFINED Python3_FIND_VIRTUALENV) AND
(NOT Python_FIND_VIRTUALENV STREQUAL Python3_FIND_VIRTUALENV))
message(WARNING "Python3_FIND_VIRTUALENV and Python_FIND_VIRTUALENV are defined differently. "
"Make sure that the variables have the same values.")
endif()
# It's a little silly to detect Python a second time, but nanobind's cmake
# code looks for Python_ not Python3_.
find_package(Python ${MLIR_MINIMUM_PYTHON_VERSION}
COMPONENTS Interpreter ${_python_development_component} REQUIRED)
unset(_python_development_component)
message(STATUS "Found python include dirs: ${Python3_INCLUDE_DIRS}")
message(STATUS "Found python libraries: ${Python3_LIBRARIES}")
message(STATUS "Found numpy v${Python3_NumPy_VERSION}: ${Python3_NumPy_INCLUDE_DIRS}")
message(STATUS "Python extension suffix for modules: '${Python3_SOABI}'")
if(nanobind_DIR)
message(STATUS "Using explicit nanobind cmake directory: ${nanobind_DIR} (-Dnanobind_DIR to change)")
else()
message(STATUS "Checking for nanobind in python path...")
execute_process(
COMMAND "${Python3_EXECUTABLE}"
-c "import nanobind;print(nanobind.cmake_dir(), end='')"
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE STATUS
OUTPUT_VARIABLE PACKAGE_DIR
ERROR_QUIET)
if(NOT STATUS EQUAL "0")
message(FATAL_ERROR "not found (install via 'pip install nanobind' or set nanobind_DIR)")
endif()
message(STATUS "found (${PACKAGE_DIR})")
set(nanobind_DIR "${PACKAGE_DIR}")
execute_process(
COMMAND "${Python3_EXECUTABLE}"
-c "import nanobind;print(nanobind.include_dir(), end='')"
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE STATUS
OUTPUT_VARIABLE PACKAGE_DIR
ERROR_QUIET)
if(NOT STATUS EQUAL "0")
message(FATAL_ERROR "not found (install via 'pip install nanobind' or set nanobind_DIR)")
endif()
set(nanobind_INCLUDE_DIR "${PACKAGE_DIR}")
endif()
find_package(nanobind 2.9 CONFIG REQUIRED)
message(STATUS "Found nanobind v${nanobind_VERSION}: ${nanobind_INCLUDE_DIR}")
message(STATUS "Python prefix = '${PYTHON_MODULE_PREFIX}', "
"suffix = '${PYTHON_MODULE_SUFFIX}', "
"extension = '${PYTHON_MODULE_EXTENSION}")
endif()
endmacro()
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