build.py

"""
Copyright (c) 2020, The Decred developers
See LICENSE for details

This file implements Cython integration (see https://cython.org/) to generate
a C extension that speeds up the low-level secp256k1 crypto code. This is used
by the Poetry tool when generating the wheel archive via its `build` command.

It uses a currently undocumented Poetry feature, see:
https://github.com/python-poetry/poetry/issues/11#issuecomment-379484540

If Cython or a C compiler cannot be found, we skip the compilation
of the C extension, and the Python code will be used.

The shared library can also be built manually using the command:

$ cythonize -X language_level=3 -a -i ./decred/crypto/secp256k1/field.py
"""

from distutils.command.build_ext import build_ext


class BuildExt(build_ext):
    def build_extensions(self):
        try:
            super().build_extensions()
        except Exception:
            pass


def build(setup_kwargs):
    try:
        from Cython.Build import cythonize

        setup_kwargs.update(
            dict(
                ext_modules=cythonize(["decred/crypto/secp256k1/field.py"]),
                cmdclass=dict(build_ext=BuildExt),
            )
        )
    except Exception:
        pass