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# Macros and functions related to detecting details of the Python environment.
# Finds and configures python packages needed to build MLIR Python bindings.
macro(mlir_configure_python_dev_packages)
if(CMAKE_VERSION VERSION_LESS "3.19.0")
message(SEND_ERROR
"Building MLIR Python bindings is known to rely on CMake features "
"that require at least version 3.19. Recommend upgrading to 3.19+ "
"for full support. Detected current version: ${CMAKE_VERSION}")
endif()
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 ${LLVM_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 ${LLVM_MINIMUM_PYTHON_VERSION}
COMPONENTS Interpreter ${_python_development_component} NumPy 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}: ${Python3_NumPy_INCLUDE_DIRS}")
mlir_detect_pybind11_install()
find_package(pybind11 2.8 CONFIG REQUIRED)
message(STATUS "Found pybind11 v${pybind11_VERSION}: ${pybind11_INCLUDE_DIR}")
message(STATUS "Python prefix = '${PYTHON_MODULE_PREFIX}', "
"suffix = '${PYTHON_MODULE_SUFFIX}', "
"extension = '${PYTHON_MODULE_EXTENSION}")
endmacro()
# Detects a pybind11 package installed in the current python environment
# and sets variables to allow it to be found. This allows pybind11 to be
# installed via pip, which typically yields a much more recent version than
# the OS install, which will be available otherwise.
function(mlir_detect_pybind11_install)
if(pybind11_DIR)
message(STATUS "Using explicit pybind11 cmake directory: ${pybind11_DIR} (-Dpybind11_DIR to change)")
else()
message(STATUS "Checking for pybind11 in python path...")
execute_process(
COMMAND "${Python3_EXECUTABLE}"
-c "import pybind11;print(pybind11.get_cmake_dir(), end='')"
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE STATUS
OUTPUT_VARIABLE PACKAGE_DIR
ERROR_QUIET)
if(NOT STATUS EQUAL "0")
message(STATUS "not found (install via 'pip install pybind11' or set pybind11_DIR)")
return()
endif()
message(STATUS "found (${PACKAGE_DIR})")
set(pybind11_DIR "${PACKAGE_DIR}" PARENT_SCOPE)
endif()
endfunction()
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