Adding msvs2013 support to scons.

scons-2.0.1/engine/SCons/Tool/MSCommon/vc.py

 #
 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
 # without limitation the rights to use, copy, modify, merge, publish,
 # distribute, sublicense, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
@@ skipping 110 matching lines @@
         msg = "Unrecognized host architecture %s"
         raise ValueError(msg % repr(host_platform))
 
     try:
         target = _ARCH_TO_CANONICAL[target_platform.lower()]
     except KeyError, e:
         raise ValueError("Unrecognized target architecture %s" % target_platform)
 
     return (host, target,req_target_platform)
 
-_VCVER = ["10.0", "9.0", "9.0Exp","8.0", "8.0Exp","7.1", "7.0", "6.0"]
+_VCVER = ["12.0", "10.0", "9.0", "9.0Exp","8.0", "8.0Exp","7.1", "7.0", "6.0"]
 
 _VCVER_TO_PRODUCT_DIR = {
+        '12.0': [
+            r'Microsoft\VisualStudio\12.0\Setup\VC\ProductDir'],
         '10.0': [
             r'Microsoft\VisualStudio\10.0\Setup\VC\ProductDir'],
         '9.0': [
             r'Microsoft\VisualStudio\9.0\Setup\VC\ProductDir'],
         '9.0Exp' : [
             r'Microsoft\VCExpress\9.0\Setup\VC\ProductDir'],
         '8.0': [
             r'Microsoft\VisualStudio\8.0\Setup\VC\ProductDir'],
         '8.0Exp': [
             r'Microsoft\VCExpress\8.0\Setup\VC\ProductDir'],
@@ skipping 303 matching lines @@
     for k, v in d.items():
         debug('vc.py:msvc_setup_env() env:%s -> %s'%(k,v))
         env.PrependENVPath(k, v, delete_existing=True)
 
 def msvc_exists(version=None):
     vcs = cached_get_installed_vcs()
     if version is None:
         return len(vcs) > 0
     return version in vcs