build_ext.py 文件源码

def finalize_options(self):
        if self.parallel:
            try:
                self.parallel = int(self.parallel)
            except ValueError:
                raise ValueError("--parallel/-j argument must be an integer")

        # Ensure that self.include_dirs and self.distribution.include_dirs
        # refer to the same list object. finalize_options will modify
        # self.include_dirs, but self.distribution.include_dirs is used
        # during the actual build.
        # self.include_dirs is None unless paths are specified with
        # --include-dirs.
        # The include paths will be passed to the compiler in the order:
        # numpy paths, --include-dirs paths, Python include path.
        if isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)
        incl_dirs = self.include_dirs or []
        if self.distribution.include_dirs is None:
            self.distribution.include_dirs = []
        self.include_dirs = self.distribution.include_dirs
        self.include_dirs.extend(incl_dirs)

        old_build_ext.finalize_options(self)
        self.set_undefined_options('build', ('parallel', 'parallel'))