scons: Support building with the Windows SDK.

x86_64 is also supported.
diff --git a/scons/winsdk.py b/scons/winsdk.py
new file mode 100644
index 0000000..255f9c5
--- /dev/null
+++ b/scons/winsdk.py
@@ -0,0 +1,139 @@
+"""winsdk
+
+Tool-specific initialization for Microsoft Windows SDK.
+
+"""
+
+#
+# Copyright (c) 2001-2007 The SCons Foundation
+# Copyright (c) 2008 Tungsten Graphics, Inc.
+# Copyright (c) 2009 VMware, Inc.
+#
+# 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:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+import os.path
+import platform
+
+import SCons.Errors
+import SCons.Util
+
+import msvc_sa
+import mslib_sa
+import mslink_sa
+
+
+def get_vs_root(env):
+    # TODO: Check HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\SxS\VS7 
+    path = os.path.join(os.getenv('ProgramFiles', r'C:\Program Files'), 'Microsoft Visual Studio 9.0')
+    return path 
+
+def get_vs_paths(env):
+    vs_root = get_vs_root(env)
+    if vs_root is None:
+        raise SCons.Errors.InternalError, "WINSDK compiler not found"
+
+    tool_path = os.path.join(vs_root, 'Common7', 'IDE')
+
+    env.PrependENVPath('PATH', tool_path)
+
+def get_vc_root(env):
+    # TODO: Check HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\SxS\VC7 
+    path = os.path.join(os.getenv('ProgramFiles', r'C:\Program Files'), 'Microsoft Visual Studio 9.0', 'VC')
+    return path 
+
+def get_vc_paths(env):
+    vc_root = get_vc_root(env)
+    if vc_root is None:
+        raise SCons.Errors.InternalError, "WINSDK compiler not found"
+
+    target_cpu = env['machine']
+
+    if target_cpu in ('generic', 'x86'):
+        bin_dir = 'bin'
+        lib_dir = 'lib'
+    elif target_cpu == 'x86_64':
+        # TODO: take in consideration the host cpu
+        bin_dir = r'bin\x86_amd64'
+        lib_dir = r'lib\amd64'
+    else:
+        raise SCons.Errors.InternalError, "Unsupported target machine"
+    include_dir = 'include'
+
+    exe_path     = os.path.join(vc_root, bin_dir)
+    include_path = os.path.join(vc_root, include_dir)
+    lib_path     = os.path.join(vc_root, lib_dir)
+
+    env.PrependENVPath('INCLUDE', include_path)
+    env.PrependENVPath('LIB', lib_path)
+    env.PrependENVPath('PATH', exe_path)
+
+def get_sdk_root(env):
+    if SCons.Util.can_read_reg:
+        key = r'SOFTWARE\Microsoft\Microsoft SDKs\Windows\CurrentInstallFolder'
+        try:
+            path, t = SCons.Util.RegGetValue(SCons.Util.HKEY_LOCAL_MACHINE, key)
+        except SCons.Util.RegError:
+            pass
+        else:
+            return path
+
+    return None 
+
+def get_sdk_paths(env):
+    sdk_root = get_sdk_root(env)
+    if sdk_root is None:
+        raise SCons.Errors.InternalError, "WINSDK not found"
+
+    target_cpu = env['machine']
+
+    bin_dir = 'Bin'
+    if target_cpu in ('generic', 'x86'):
+        lib_dir = 'Lib'
+    elif target_cpu == 'x86_64':
+        lib_dir = 'Lib/x64'
+    else:
+        raise SCons.Errors.InternalError, "Unsupported target machine"
+    include_dir = 'Include'
+
+    exe_path     = os.path.join(sdk_root, bin_dir)
+    include_path = os.path.join(sdk_root, include_dir)
+    lib_path     = os.path.join(sdk_root, lib_dir)
+
+    env.PrependENVPath('INCLUDE', include_path)
+    env.PrependENVPath('LIB', lib_path)
+    env.PrependENVPath('PATH', exe_path)
+
+def generate(env):
+    if not env.has_key('ENV'):
+        env['ENV'] = {}
+    
+    get_vs_paths(env)
+    get_vc_paths(env)
+    get_sdk_paths(env)
+
+    msvc_sa.generate(env)
+    mslib_sa.generate(env)
+    mslink_sa.generate(env)
+
+def exists(env):
+    return get_vc_root(env) is not None and get_sdk_root(env) is not None
+
+# vim:set ts=4 sw=4 et: