build: refactor Linux binary stripping to align with upstream (#48208)

build/linux/strip_binary.py

@@ -0,0 +1,63 @@
+#!/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.
+
+# This has been adapted from https://source.chromium.org/chromium/chromium/src/+/main:build/linux/strip_binary.py;drc=c220a41e0422d45f1657c28146d32e99cc53640b
+# The notable difference is it has an option to compress the debug sections
+
+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("--compress-debug-sections",
+                      action="store_true",
+                      help="Compress extracted debug info.")
+  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>
+
+  objcopy_args = [
+      "--only-keep-debug",
+      args.binary_input,
+      args.symbol_output,
+  ]
+
+  if args.compress_debug_sections:
+    objcopy_args.insert(0, "--compress-debug-sections")
+
+  subprocess.check_output([args.llvm_objcopy_binary_path] + objcopy_args)
+  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())