[linux] Improve link time with Chromium-bundled binutils.

third_party/binutils/download.py

Index: third_party/binutils/download.py
diff --git a/third_party/binutils/download.py b/third_party/binutils/download.py
new file mode 100755
index 0000000000000000000000000000000000000000..c3ca2052e50f1768cfeebdc2f317ea07cbe09793
--- /dev/null
+++ b/third_party/binutils/download.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python
+# Copyright 2014 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.
+# vim: set ts=2 sw=2 et sts=2 ai:
+
+"""Minimal tool to download binutils from Google storage.
+
+TODO(mithro): Replace with generic download_and_extract tool.
+"""
+
+import os
+import platform
+import re
+import shutil
+import subprocess
+import sys
+
+
+BINUTILS_DIR = os.path.abspath(os.path.dirname(__file__))
+BINUTILS_FILE = 'binutils.tar.bz2'
+BINUTILS_TOOLS = ['bin/ld.gold', 'bin/objcopy', 'bin/objdump']
+BINUTILS_OUT = 'Release'
+
+DETECT_HOST_ARCH = os.path.abspath(os.path.join(
+    BINUTILS_DIR, '../../build/detect_v8_host_arch.py'))
+
+
+def ReadFile(filename):
+  with file(filename, 'r') as f:
+    return f.read().strip()
+
+
+def WriteFile(filename, content):
+  assert not os.path.exists(filename)
+  with file(filename, 'w') as f:
+    f.write(content)
+    f.write('\n')
+
+
+def GetArch():
+  gyp_host_arch = re.search(
+      'host_arch=(\S*)', os.environ.get('GYP_DEFINES', ''))
+  if gyp_host_arch:
+    arch = gyp_host_arch.group(1)
+    # This matches detect_host_arch.py.
+    if arch == 'x86_64':
+      return 'x64'
+    return arch
+
+  return subprocess.check_output(['python', DETECT_HOST_ARCH]).strip()
+
+
+def FetchAndExtract(arch):
+  archdir = os.path.join(BINUTILS_DIR, 'Linux_' + arch)
+  tarball = os.path.join(archdir, BINUTILS_FILE)
+  outdir = os.path.join(archdir, BINUTILS_OUT)
+
+  sha1file = tarball + '.sha1'
+  if not os.path.exists(sha1file):
+    print "WARNING: No binutils found for your architecture (%s)!" % arch
+    return 0
+
+  checksum = ReadFile(sha1file)
+
+  stampfile = tarball + '.stamp'
+  if os.path.exists(stampfile):
+    if (os.path.exists(tarball) and
+        os.path.exists(outdir) and
+        checksum == ReadFile(stampfile)):
+      return 0
+    else:
+      os.unlink(stampfile)
+
+  print "Downloading", tarball
+  subprocess.check_call([
+      'download_from_google_storage',
+      '--no_resume',
+      '--no_auth',
+      '--bucket', 'chromium-binutils',
+      '-s', sha1file])
+  assert os.path.exists(tarball)
+
+  if os.path.exists(outdir):
+    shutil.rmtree(outdir)
+  assert not os.path.exists(outdir)
+  os.makedirs(outdir)
+  assert os.path.exists(outdir)
+
+  print "Extracting", tarball
+  subprocess.check_call(['tar', 'axf', tarball], cwd=outdir)
+
+  for tool in BINUTILS_TOOLS:
+    assert os.path.exists(os.path.join(outdir, tool))
+
+  WriteFile(stampfile, checksum)
+  return 0
+
+
+def main(args):
+  if not sys.platform.startswith('linux'):
+    return 0
+
+  arch = GetArch()
+  if arch == 'x64':
+    return FetchAndExtract(arch)
+  if arch == 'ia32':
+    ret = FetchAndExtract(arch)
+    if ret != 0:
+      return ret
+    # Fetch the x64 toolchain as well for official bots with 64-bit kernels.
+    return FetchAndExtract('x64')
+  print "Host architecture %s is not supported." % arch
+  return 1
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))