Add options for host/target OS/arch.

pylib/gyp/common.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from __future__ import with_statement
 
 import errno
 import filecmp
 import os.path
+import platform
 import re
 import tempfile
 import sys
 
 
 # A minimal memoizing decorator. It'll blow up if the args aren't immutable,
 # among other "problems".
 class memoize(object):
   def __init__(self, func):
     self.func = func
@@ skipping 373 matching lines @@
   if sys.platform.startswith('freebsd'):
     return 'freebsd'
   if sys.platform.startswith('openbsd'):
     return 'openbsd'
   if sys.platform.startswith('aix'):
     return 'aix'
 
   return 'linux'
 
 
+def DetectHostArchitecture():
+  """Returns the system's architecture."""

[Torne, 2013/03/11 16:16:50]

This matches all the machine types that are currently matched by v8's
architecture detection embedded in its gyp file (and also the machine types
matched by the similar code in Chromium's src/build/android/envsetup.sh) - if
there are other machine types we should detect, they can be added here as well,
but this should be enough for Chromium.

+  architectures = {
+    'i86pc': 'ia32',
+    'x86_64': 'x64',
+    'amd64': 'x64',
+  }
+
+  machine = platform.machine()
+  if machine in architectures:
+    return architectures[machine]
+  if re.match('i.86$', machine):
+    return 'ia32'
+  if machine.startswith('arm'):
+    return 'arm'
+  if machine.startswith('mips'):
+    return 'mipsel'
+
+  return 'unknown'
+
+
 def CopyTool(flavor, out_path):
   """Finds (mac|sun|win)_tool.gyp in the gyp directory and copies it
   to |out_path|."""
   prefix = { 'solaris': 'sun', 'mac': 'mac', 'win': 'win' }.get(flavor, None)
   if not prefix:
     return
 
   # Slurp input file.
   source_path = os.path.join(
       os.path.dirname(os.path.abspath(__file__)), '%s_tool.py' % prefix)
@@ skipping 69 matching lines @@
       return
     visited.add(node)
     visiting.add(node)
     for neighbor in get_edges(node):
       Visit(neighbor)
     visiting.remove(node)
     ordered_nodes.insert(0, node)
   for node in sorted(graph):
     Visit(node)
   return ordered_nodes