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import os
import platform
import sys
from setuptools import Extension, setup
min_glibc = (2, 9)
def check_libc():
"""Return False if we have glibc < 2.9 and should not build the C extension."""
# Borrowed from pip internals
# https://github.com/pypa/pip/blob/20.1.1/src/pip/_internal/utils/glibc.py#L21-L36
try:
# os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17":
libc_name, libc_version = os.confstr("CS_GNU_LIBC_VERSION").split()
except (AttributeError, OSError, ValueError):
# os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)...
return True
if libc_name != "glibc":
# Attempt to build with musl or other libc
return True
libc_version_tuple = tuple(int(x) for x in libc_version.split(".")[:2])
return libc_version_tuple >= min_glibc
cpython = platform.python_implementation() == "CPython"
windows = sys.platform.startswith("win")
use_c_ext = os.environ.get("CBOR2_BUILD_C_EXTENSION", None)
optional = True
if use_c_ext == "1":
build_c_ext = True
optional = False
elif use_c_ext == "0":
build_c_ext = False
else:
build_c_ext = cpython and (windows or check_libc())
# Enable GNU features for libc's like musl, should have no effect
# on Apple/BSDs
if build_c_ext and not windows:
gnu_flag = ["-D_GNU_SOURCE"]
else:
gnu_flag = []
if build_c_ext:
_cbor2 = Extension(
"_cbor2",
# math.h routines are built-in to MSVCRT
libraries=["m"] if not windows else [],
extra_compile_args=["-std=c99"] + gnu_flag,
sources=[
"source/module.c",
"source/encoder.c",
"source/decoder.c",
"source/tags.c",
"source/halffloat.c",
],
optional=optional,
)
kwargs = {"ext_modules": [_cbor2]}
else:
kwargs = {}
setup(
use_scm_version={"version_scheme": "guess-next-dev", "local_scheme": "dirty-tag"},
setup_requires=["setuptools >= 61", "setuptools_scm >= 6.4"],
**kwargs,
)
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