clang: error: no input files

[foreverlms]

OK, Below is my problem description:
I have a C++ source project, and I want to generate python API for it. So I use pybind11 to bind it. Typically I follow this tutorial: https://github.com/pybind/cmake_example/blob/master/setup.py to write a setup.py with a little difference: I add a super() call in build_ext derived class:

    def build_extension(self, ext):
        # calling below is my adding, and it seems to break the compiling procedure.
        **super().build_extension(ext)**
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))

        # required for auto-detection & inclusion of auxiliary "native" libs
        if not extdir.endswith(os.path.sep):

But when I add this line super().build_extension(ext), there is compiling error when I run python setup.py sdist bdist_wheel :

running bdist_wheel
running build
running build_ext
building 'foo' extension
creating build/lib.macosx-10.9-x86_64-3.8
gcc -bundle -undefined dynamic_lookup -L/opt/anaconda3/envs/d2l/lib -arch x86_64 -L/opt/anaconda3/envs/d2l/lib -arch x86_64 -arch x86_64 -o build/lib.macosx-10.9-x86_64-3.8/foo.cpython-38-darwin.so
clang: error: no input files

When I remove this line, everything seems good. Am I wrong to call this super()？