GN: Avoid nontrivial shell commands in gcc_toolchain tool("link")

build/toolchain/gcc_link_wrapper.py

Index: build/toolchain/gcc_link_wrapper.py
diff --git a/build/toolchain/gcc_link_wrapper.py b/build/toolchain/gcc_link_wrapper.py
new file mode 100755
index 0000000000000000000000000000000000000000..74eb4604a839c0c12da84f879861ba3afbc0a7e5
--- /dev/null
+++ b/build/toolchain/gcc_link_wrapper.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Runs a linking command and optionally a strip command.
+
+This script exists to avoid using complex shell commands in
+gcc_toolchain.gni's tool("link"), in case the host running the compiler
+does not have a POSIX-like shell (e.g. Windows).
+"""
+
+import argparse
+import subprocess
+import sys
+
+
+def main():
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--strip',
+                      help='The strip binary to run',
+                      metavar='PATH')
+  parser.add_argument('--unstripped-file',
+                      required=True,
+                      help='Executable file produced by linking command',
+                      metavar='FILE')
+  parser.add_argument('--output',
+                      required=True,
+                      help='Final output executable file',
+                      metavar='FILE')
+  parser.add_argument('command', nargs='+',
+                      help='Linking command')
+  args = parser.parse_args()
+
+  # First, run the actual link.
+  result = subprocess.call(args.command)
+  if result != 0:
+    return result
+
+  # Finally, strip the linked executable (if desired).
+  if args.strip:
+    result = subprocess.call([args.strip, '--strip-unneeded',
+                              '-o', args.output, args.unstripped_file])
+
+  return result
+
+
+if __name__ == "__main__":
+  sys.exit(main())