def build_extension()

in setup.py [0:0]
28 lines of code
12 McCabe index (conditional complexity)

    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

        if "DEBUG" in os.environ:
            # TODO: is there any better approach?
            cfg = "Debug" if os.environ["DEBUG"] == "1" else "Release"
        else:
            cfg = "Debug" if self.debug else "Release"

        cmake_args = [
            f"-DCMAKE_BUILD_TYPE={cfg}",
            # f"-DCMAKE_PREFIX_PATH={torch.utils.cmake_prefix_path}",
            f"-DCMAKE_INSTALL_PREFIX={extdir}",
            # "-DCMAKE_VERBOSE_MAKEFILE=ON",
            # f"-DPython_INCLUDE_DIR={distutils.sysconfig.get_python_inc()}",
            "-DVELOX_CODEGEN_SUPPORT=OFF",
            "-DVELOX_BUILD_MINIMAL=ON",
        ]
        build_args = ["--target", "install"]

        # Default to Ninja
        if "CMAKE_GENERATOR" not in os.environ:
            cmake_args += ["-GNinja"]

        # 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)

        subprocess.check_call(
            ["cmake", str(ROOT_DIR)] + cmake_args, cwd=self.build_temp
        )
        subprocess.check_call(
            ["cmake", "--build", "."] + build_args, cwd=self.build_temp
        )