7 files changed, 33 insertions, 18 deletions
diff --git a/engine/SCons/Tool/MSCommon/__init__.py b/engine/SCons/Tool/MSCommon/__init__.py
index 4f56a4a..7a23c87 100644
--- a/engine/SCons/Tool/MSCommon/__init__.py
+++ b/engine/SCons/Tool/MSCommon/__init__.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/__init__.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """
 Common functions for Microsoft Visual Studio and Visual C/C++.
diff --git a/engine/SCons/Tool/MSCommon/arch.py b/engine/SCons/Tool/MSCommon/arch.py
index ce214c2..25ec1b9 100644
--- a/engine/SCons/Tool/MSCommon/arch.py
+++ b/engine/SCons/Tool/MSCommon/arch.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/arch.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """Module to define supported Windows chip architectures.
 """
diff --git a/engine/SCons/Tool/MSCommon/common.py b/engine/SCons/Tool/MSCommon/common.py
index 219e680..d7d3b79 100644
--- a/engine/SCons/Tool/MSCommon/common.py
+++ b/engine/SCons/Tool/MSCommon/common.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/common.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/common.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """
 Common helper functions for working with the Microsoft tool chain.
@@ -60,12 +60,27 @@ def is_win64():
     # Unfortunately, python does not provide a useful way to determine
     # if the underlying Windows OS is 32-bit or 64-bit.  Worse, whether
     # the Python itself is 32-bit or 64-bit affects what it returns,
-    # so nothing in sys.* or os.* help.  So we go to the registry to
-    # look directly for a clue from Windows, caching the result to
-    # avoid repeated registry calls.
+    # so nothing in sys.* or os.* help.  
+
+    # Apparently the best solution is to use env vars that Windows
+    # sets.  If PROCESSOR_ARCHITECTURE is not x86, then the python
+    # process is running in 64 bit mode (on a 64-bit OS, 64-bit
+    # hardware, obviously).
+    # If this python is 32-bit but the OS is 64, Windows will set
+    # ProgramW6432 and PROCESSOR_ARCHITEW6432 to non-null.
+    # (Checking for HKLM\Software\Wow6432Node in the registry doesn't
+    # work, because some 32-bit installers create it.)
     global _is_win64
     if _is_win64 is None:
-        _is_win64 = has_reg(r"Software\Wow6432Node")
+        # I structured these tests to make it easy to add new ones or
+        # add exceptions in the future, because this is a bit fragile.
+        _is_win64 = False
+        if os.environ.get('PROCESSOR_ARCHITECTURE','x86') != 'x86':
+            _is_win64 = True
+        if os.environ.get('PROCESSOR_ARCHITEW6432'):
+            _is_win64 = True
+        if os.environ.get('ProgramW6432'):
+            _is_win64 = True
     return _is_win64
 
 
diff --git a/engine/SCons/Tool/MSCommon/netframework.py b/engine/SCons/Tool/MSCommon/netframework.py
index 300f662..b52e597 100644
--- a/engine/SCons/Tool/MSCommon/netframework.py
+++ b/engine/SCons/Tool/MSCommon/netframework.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/netframework.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/netframework.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """
 """
diff --git a/engine/SCons/Tool/MSCommon/sdk.py b/engine/SCons/Tool/MSCommon/sdk.py
index f1345e4..f458dc0 100644
--- a/engine/SCons/Tool/MSCommon/sdk.py
+++ b/engine/SCons/Tool/MSCommon/sdk.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/sdk.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """Module to detect the Platform/Windows SDK
 
diff --git a/engine/SCons/Tool/MSCommon/vc.py b/engine/SCons/Tool/MSCommon/vc.py
index c02f15c..a190b8e 100644
--- a/engine/SCons/Tool/MSCommon/vc.py
+++ b/engine/SCons/Tool/MSCommon/vc.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -30,7 +30,7 @@
 #   * test on 64 bits XP +  VS 2005 (and VS 6 if possible)
 #   * SDK
 #   * Assembly
-__revision__ = "src/engine/SCons/Tool/MSCommon/vc.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vc.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """Module for Visual C/C++ detection and configuration.
 """
diff --git a/engine/SCons/Tool/MSCommon/vs.py b/engine/SCons/Tool/MSCommon/vs.py
index f9531c0..5be29c1 100644
--- a/engine/SCons/Tool/MSCommon/vs.py
+++ b/engine/SCons/Tool/MSCommon/vs.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+# 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
@@ -21,7 +21,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py 4577 2009/12/27 19:43:56 scons"
+__revision__ = "src/engine/SCons/Tool/MSCommon/vs.py 4629 2010/01/17 22:23:21 scons"
 
 __doc__ = """Module to detect Visual Studio and/or Visual C/C++
 """