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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>C///</title>
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"""PEP 656 support.

This module implements logic to detect if the currently running Python is
linked against musl, and what musl version is used.
"""

import functools
import re
import subprocess
import sys
from typing import Iterator, NamedTuple, Optional

from ._elffile import ELFFile


class _MuslVersion(NamedTuple):
    major: int
    minor: int


def _parse_musl_version(output: str) -> Optional[_MuslVersion]:
    lines = [n for n in (n.strip() for n in output.splitlines()) if n]
    if len(lines) < 2 or lines[0][:4] != "musl":
        return None
    m = re.match(r"Version (\d+)\.(\d+)", lines[1])
    if not m:
        return None
    return _MuslVersion(major=int(m.group(1)), minor=int(m.group(2)))


@functools.lru_cache()
def _get_musl_version(exe