Autodetect no-strict-aliasing, propagate toolchain option to SCons

src/SConscript

 # Copyright 2011 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
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 13 matching lines @@
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import sys
 from os.path import join, dirname, abspath
 root_dir = dirname(File('SConstruct').rfile().abspath)
 sys.path.append(join(root_dir, 'tools'))
 import js2c
 Import('context')
+Import('tools')
 
 
 SOURCES = {
   'all': Split("""
     accessors.cc
     allocation.cc
     api.cc
     assembler.cc
     ast.cc
     atomicops_internals_x86_gcc.cc
@@ skipping 254 matching lines @@
 debug-debugger.js
 '''.split()
 
 
 def Abort(message):
   print message
   sys.exit(1)
 
 
 def ConfigureObjectFiles():
-  env = Environment()
+  env = Environment(tools=tools)
   env.Replace(**context.flags['v8'])
   context.ApplyEnvOverrides(env)
   env['BUILDERS']['JS2C'] = Builder(action=js2c.JS2C)
   env['BUILDERS']['Snapshot'] = Builder(action='$SOURCE $TARGET --logfile "$LOGFILE" --log-snapshot-positions')
 
   # Build the standard platform-independent source files.
   source_files = context.GetRelevantSources(SOURCES)
 
   d8_files = context.GetRelevantSources(D8_FILES)
   d8_js = env.JS2C('d8-js.cc', 'd8.js', TYPE='D8')
@@ skipping 28 matching lines @@
       snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')