build/linux/strip_binary.py

#!/usr/bin/env python3
#
# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import subprocess
import sys


def main() -> int:
    parser = argparse.ArgumentParser(
        description="Strip binary using LLVM tools."
    )
    parser.add_argument(
        "--llvm-strip-binary-path", help="Path to llvm-strip executable."
    )
    parser.add_argument(
        "--llvm-objcopy-binary-path",
        required=True,
        help="Path to llvm-objcopy executable.",
    )
    parser.add_argument("--binary-input", help="Input ELF binary.")
    parser.add_argument(
        "--symbol-output", help="File to write extracted debug info (.debug)."
    )
    parser.add_argument(
        "--stripped-binary-output", help="File to write stripped binary."
    )
    args = parser.parse_args()

    # Replicate the behavior of:
    # eu-strip <binary_input> -o <stripped_binary_output> -f <symbol_output>
    subprocess.check_output(
        [
            args.llvm_objcopy_binary_path,
            "--only-keep-debug",
            args.binary_input,
            args.symbol_output,
        ]
    )
    subprocess.check_output(
        [
            args.llvm_strip_binary_path,
            "--strip-debug",
            "--strip-unneeded",
            "-o",
            args.stripped_binary_output,
            args.binary_input,
        ]
    )
    subprocess.check_output(
        [
            args.llvm_objcopy_binary_path,
            f"--add-gnu-debuglink={args.symbol_output}",
            args.stripped_binary_output,
        ]
    )

    return 0


if __name__ == "__main__":
    sys.exit(main())