Beginning work on GN build

build/config/mac/sdk_info.py

Index: build/config/mac/sdk_info.py
diff --git a/build/config/mac/sdk_info.py b/build/config/mac/sdk_info.py
new file mode 100644
index 0000000000000000000000000000000000000000..9a7d57a85f23dd7ba19762680e35c6b7d73a5b68
--- /dev/null
+++ b/build/config/mac/sdk_info.py
@@ -0,0 +1,64 @@
+# 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.
+
+import os
+import subprocess
+import sys
+
+# This script prints information about the build system, the operating
+# system and the iOS or Mac SDK (depending on the platform "iphonesimulator",
+# "iphoneos" or "macosx" generally).
+#
+# In the GYP build, this is done inside GYP itself based on the SDKROOT
+# variable.
+
+def FormatVersion(version):
+  """Converts Xcode version to a format required for Info.plist."""
+  version = version.replace('.', '')
+  version = version + '0' * (3 - len(version))
+  return version.zfill(4)
+
+
+def FillXcodeVersion(settings):
+  """Fills the Xcode version and build number into |settings|."""
+  lines = subprocess.check_output(['xcodebuild', '-version']).splitlines()
+  settings['xcode_version'] = FormatVersion(lines[0].split()[-1])
+  settings['xcode_build'] = lines[-1].split()[-1]
+
+
+def FillMachineOSBuild(settings):
+  """Fills OS build number into |settings|."""
+  settings['machine_os_build'] = subprocess.check_output(
+      ['sw_vers', '-buildVersion']).strip()
+
+
+def FillSDKPathAndVersion(settings, platform, xcode_version):
+  """Fills the SDK path and version for |platform| into |settings|."""
+  settings['sdk_path'] = subprocess.check_output([
+      'xcrun', '-sdk', platform, '--show-sdk-path']).strip()
+  settings['sdk_version'] = subprocess.check_output([
+      'xcrun', '-sdk', platform, '--show-sdk-version']).strip()
+  # TODO: unconditionally use --show-sdk-build-version once Xcode 7.2 or
+  # higher is required to build Chrome for iOS or OS X.
+  if xcode_version >= '0720':
+    settings['sdk_build'] = subprocess.check_output([
+        'xcrun', '-sdk', platform, '--show-sdk-build-version']).strip()
+  else:
+    settings['sdk_build'] = settings['sdk_version']
+
+
+if __name__ == '__main__':
+  if len(sys.argv) != 2:
+    sys.stderr.write(
+        'usage: %s [iphoneos|iphonesimulator|macosx]\n' %
+        os.path.basename(sys.argv[0]))
+    sys.exit(1)
+
+  settings = {}
+  FillMachineOSBuild(settings)
+  FillXcodeVersion(settings)
+  FillSDKPathAndVersion(settings, sys.argv[1], settings['xcode_version'])
+
+  for key in sorted(settings):
+    print '%s="%s"' % (key, settings[key])