diff options
Diffstat (limited to 'src/engine/SCons/Tool/MSCommon/common.py')
| -rw-r--r-- | src/engine/SCons/Tool/MSCommon/common.py | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/src/engine/SCons/Tool/MSCommon/common.py b/src/engine/SCons/Tool/MSCommon/common.py index 8fc49cc..d7d3b79 100644 --- a/src/engine/SCons/Tool/MSCommon/common.py +++ b/src/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 19:44:43 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 |