Function _force_relink

tests/measure_esp32s3_opt_ins.py:328–344

Delete the prior ELF so PIO's link step actually runs. PIO's build cache returns cached .o files on consecutive runs with overlapping object hashes — that's the right speed/correctness trade-off. But the link step decides whether to relink based on object-file timestamps, NOT on pla

()

def _force_relink() -> None:
    """Delete the prior ELF so PIO's link step actually runs.

    PIO's build cache returns cached .o files on consecutive runs with
    overlapping object hashes — that's the right speed/correctness
    trade-off. But the link step decides whether to relink based on
    object-file timestamps, NOT on platformio.ini / sdkconfig changes.
    Switching configs that affect only sdkconfig (e.g. stage3 ↔
    baseline) can therefore leave the previous config's ELF on disk
    even after `bash compile` returns successfully — and the downstream
    `bash bloat` step measures that stale ELF.

    Deleting the ELF before each compile forces the link to run; the
    cached objects make the rebuild fast anyway. See #2940.
    """
    if _ELF_PATH.is_file():
        _ELF_PATH.unlink()


def measure_one(cfg: OptInConfig, example: str) -> int | None: