text: # based on https://github.com/pybind/cmake_example/blob/master/setup.py
  import os
  import sys
  import subprocess
  import shlex
  
  from setuptools import setup, Extension
  from setuptools.command.build_ext import build_ext
  
  # Convert distutils Windows platform specifiers to CMake -A arguments
  PLAT_TO_CMAKE = {
      "win32": "Win32",
      "win-amd64": "x64",
      "win-arm32": "ARM",
      "win-arm64": "ARM64",
  }
  
  
  # A CMakeExtension needs a sourcedir instead of a file list.
  # The name must be the _single_ output extension from the CMake build.
  # If you need multiple extensions, see scikit-build.
  class CMakeExtension(Extension):
      def __init__(self, name, sourcedir=""):
          Extension.__init__(self, name, sources=[])
          self.sourcedir = os.path.abspath(sourcedir)
  
  
  class CMakeBuild(build_ext):
      # Allows additional CMake args to be provided with `setup.py build_ext --cmake-args=...`
      user_options = build_ext.user_options + [('cmake-args=', None, "options to pass to CMake")]
  
      def initialize_options(self):
          build_ext.initialize_options(self)
          self.cmake_args = None
  
      def finalize_options(self):
          build_ext.finalize_options(self)
          if self.cmake_args is None:
              self.cmake_args = []
          else:
              self.cmake_args = shlex.split(self.cmake_args)
  
      def build_extension(self, ext):
          extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
  
          # required for auto-detection of auxiliary "native" libs
          if not extdir.endswith(os.path.sep):
              extdir += os.path.sep
  
          cfg = "Debug" if self.debug else "Release"
  
          # CMake lets you override the generator - we need to check this.
          # Can be set with Conda-Build, for example.
          cmake_generator = os.environ.get("CMAKE_GENERATOR", "")
  
          # Set Python_EXECUTABLE instead if you use PYBIND11_FINDPYTHON
          # EXAMPLE_VERSION_INFO shows you how to pass a value into the C++ code
          # from Python.
          cmake_args = [
              "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={}".format(extdir),
              "-DPYTHON_EXECUTABLE={}".format(sys.executable),
              "-DVERSION_INFO={}".format(self.distribution.get_version()),
              "-DCMAKE_BUILD_TYPE={}".format(cfg),  # not used on MSVC, but no harm
              "-DBUILD_PYTHON=yes",
          ]
          build_args = []
  
          if self.compiler.compiler_type == "msvc":
              # Single config generators are handled "normally"
              single_config = any(x in cmake_generator for x in {"NMake", "Ninja"})
  
              # CMake allows an arch-in-generator style for backward compatibility
              contains_arch = any(x in cmake_generator for x in {"ARM", "Win64"})
  
              # Specify the arch if using MSVC generator, but only if it doesn't
              # contain a backward-compatibility arch spec already in the
              # generator name.
              if not single_config and not contains_arch:
                  cmake_args += ["-A", PLAT_TO_CMAKE[self.plat_name]]
  
              # Multi-config generators have a different way to specify configs
              if not single_config:
                  cmake_args += [
                      "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(cfg.upper(), extdir)
                  ]
                  build_args += ["--config", cfg]
  
          # Set CMAKE_BUILD_PARALLEL_LEVEL to control the parallel build level
          # across all generators.
          if "CMAKE_BUILD_PARALLEL_LEVEL" not in os.environ:
              # self.parallel is a Python 3 only way to set parallel jobs by hand
              # using -j in the build_ext call, not supported by pip or PyPA-build.
              if hasattr(self, "parallel") and self.parallel:
                  # CMake 3.12+ only.
                  build_args += ["-j{}".format(self.parallel)]
  
          if not os.path.exists(self.build_temp):
              os.makedirs(self.build_temp)
  
          cmd = ["cmake", ext.sourcedir] + cmake_args + self.cmake_args
          print("Running", " ".join(cmd))
          subprocess.check_call(cmd, cwd=self.build_temp)
  
          cmd = ["cmake", "--build", "."] + build_args
          print("Running", " ".join(cmd))
          subprocess.check_call(cmd, cwd=self.build_temp)
  
  
  setup(
      ext_modules=[CMakeExtension("cmake")],
      cmdclass={"build_ext": CMakeBuild},
  )
  