diff options
Diffstat (limited to 'src/engine/SCons/Memoize.py')
| -rw-r--r-- | src/engine/SCons/Memoize.py | 42 |
1 files changed, 28 insertions, 14 deletions
diff --git a/src/engine/SCons/Memoize.py b/src/engine/SCons/Memoize.py index c2b4181..c4a5001 100644 --- a/src/engine/SCons/Memoize.py +++ b/src/engine/SCons/Memoize.py @@ -217,33 +217,47 @@ class Memoizer: class M: def __init__(cls, name, bases, cls_dict): - cls.has_metaclass = 1 - -class A: - __metaclass__ = M + cls.use_metaclass = 1 + def fake_method(self): + pass + new.instancemethod(fake_method, None, cls) try: - has_metaclass = A.has_metaclass + class A: + __metaclass__ = M + + use_metaclass = A.use_metaclass except AttributeError: - has_metaclass = None + use_metaclass = None + reason = 'no metaclasses' +except TypeError: + use_metaclass = None + reason = 'new.instancemethod() bug' +else: + del A del M -del A -if not has_metaclass: +if not use_metaclass: def Dump(title): pass - class Memoized_Metaclass: - # Just a place-holder so pre-metaclass Python versions don't - # have to have special code for the Memoized classes. - pass + try: + class Memoized_Metaclass(type): + # Just a place-holder so pre-metaclass Python versions don't + # have to have special code for the Memoized classes. + pass + except TypeError: + class Memoized_Metaclass: + # A place-holder so pre-metaclass Python versions don't + # have to have special code for the Memoized classes. + pass def EnableMemoization(): import SCons.Warnings - msg = 'memoization is not supported in this version of Python (no metaclasses)' - raise SCons.Warnings.NoMetaclassSupportWarning, msg + msg = 'memoization is not supported in this version of Python (%s)' + raise SCons.Warnings.NoMetaclassSupportWarning, msg % reason else: |