Prepare for using GYP build on buildbots

build/gyp_v8

 #!/usr/bin/python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 # is invoked by V8 beyond what can be done in the gclient hooks.
 
 import glob
 import os
 import shlex
 import sys
 
 script_dir = os.path.dirname(__file__)
 v8_root = os.path.normpath(os.path.join(script_dir, os.pardir))
 
+if __name__ == '__main__':
+  os.chdir(v8_root)
+  script_dir = os.path.dirname(__file__)
+  v8_root = '.'
+
 sys.path.insert(0, os.path.join(v8_root, 'tools'))
 import utils
 
 sys.path.insert(0, os.path.join(v8_root, 'build', 'gyp', 'pylib'))
 import gyp
 
 
 def apply_gyp_environment(file_path=None):
   """
   Reads in a *.gyp_env file and applies the valid keys to os.environ.
@@ skipping 35 matching lines @@
   for arg in args:
     if arg.startswith('-I') and len(arg) > 2:
       specified_includes.add(os.path.realpath(arg[2:]))
 
   result = []
   def AddInclude(path):
     if os.path.realpath(path) not in specified_includes:
       result.append(path)
 
   # Always include standalone.gypi
-  AddInclude(os.path.join(script_dir, 'standalone.gypi'))
+  AddInclude(os.path.join(v8_root, 'build', 'standalone.gypi'))
 
   # Optionally add supplemental .gypi files if present.
   supplements = glob.glob(os.path.join(v8_root, '*', 'supplement.gypi'))
   for supplement in supplements:
     AddInclude(supplement)
 
   return result
 
 
 def run_gyp(args):
@@ skipping 21 matching lines @@
 
   # If we didn't get a file, check an env var, and then fall back to
   # assuming 'all.gyp' from the same directory as the script.
   if not gyp_file_specified:
     gyp_file = os.environ.get('V8_GYP_FILE')
     if gyp_file:
       # Note that V8_GYP_FILE values can't have backslashes as
       # path separators even on Windows due to the use of shlex.split().
       args.extend(shlex.split(gyp_file))
     else:
-      args.append(os.path.join(script_dir, 'all.gyp'))
+      # Note that this must not start with "./" or things break.
+      # So we rely on having done os.chdir(v8_root) above and use the
+      # relative path.
+      args.append(os.path.join('build', 'all.gyp'))
 
   args.extend(['-I' + i for i in additional_include_files(args)])
 
   # There shouldn't be a circular dependency relationship between .gyp files
   args.append('--no-circular-check')
 
   # Set the GYP DEPTH variable to the root of the V8 project.
   args.append('--depth=' + v8_root)
 
   # If V8_GYP_SYNTAX_CHECK is set to 1, it will invoke gyp with --check
   # to enfore syntax checking.
   syntax_check = os.environ.get('V8_GYP_SYNTAX_CHECK')
   if syntax_check and int(syntax_check):
     args.append('--check')
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Generate for the architectures supported on the given platform.
   gyp_args = list(args)
-  target_arch = None
-  for p in gyp_args:
-    if p.find('-Dtarget_arch=') == 0:
-      target_arch = p
-  if target_arch is None:
-    gyp_args.append('-Dtarget_arch=ia32')
   if utils.GuessOS() == 'linux':
-    gyp_args.append('-S.ia32')
+    gyp_args.append('--generator-output=out')
   run_gyp(gyp_args)
-
-  if utils.GuessOS() == 'linux':
-    gyp_args = list(args)
-    gyp_args.append('-Dtarget_arch=x64')
-    gyp_args.append('-S.x64')
-    run_gyp(gyp_args)
-
-    gyp_args = list(args)
-    gyp_args.append('-Dv8_target_arch=arm')
-    gyp_args.append('-S.arm')
-    run_gyp(gyp_args)
-
-    gyp_args = list(args)
-    gyp_args.append('-Dv8_target_arch=mips')
-    gyp_args.append('-S.mips')
-    run_gyp(gyp_args)