run_per_program_autotune.py

#!/usr/bin/env python3
"""Thin CLI wrapper for perprog_tune.runner.

The RFunipass Autophase library is built against a newer system libstdc++ than
the one bundled in the active conda Python.  Re-exec before importing the runner
so dlopen resolves LLVM's C++ runtime from the system directory.
"""

from __future__ import annotations

import os
import sys


def _ensure_system_libstdcxx_first() -> None:
    system_lib_dir = "/usr/lib/x86_64-linux-gnu"
    if os.environ.get("PERPROG_LIBSTDCXX_REEXECED") == "1":
        return
    if not os.path.exists(os.path.join(system_lib_dir, "libstdc++.so.6")):
        return

    current = [item for item in os.environ.get("LD_LIBRARY_PATH", "").split(":") if item]
    if current and current[0] == system_lib_dir:
        return

    os.environ["LD_LIBRARY_PATH"] = ":".join([system_lib_dir, *[item for item in current if item != system_lib_dir]])
    os.environ["PERPROG_LIBSTDCXX_REEXECED"] = "1"
    os.execv(sys.executable, [sys.executable, *sys.argv])


if __name__ == "__main__":
    _ensure_system_libstdcxx_first()
    from perprog_tune.runner import main

    raise SystemExit(main())