Add options for host/target OS/arch.

pylib/gyp/common.py

Index: pylib/gyp/common.py
diff --git a/pylib/gyp/common.py b/pylib/gyp/common.py
index e50f51c3079768f65d18f164af4fc7fee5a8f262..d1bd3b878e670a84a025797901c12cba2d0fac05 100644
--- a/pylib/gyp/common.py
+++ b/pylib/gyp/common.py
@@ -7,6 +7,7 @@ from __future__ import with_statement
 import errno
 import filecmp
 import os.path
+import platform
 import re
 import tempfile
 import sys
@@ -400,6 +401,27 @@ def GetFlavor(params):
   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|."""