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== CPython 3.3.0b1 (default:efb30bdcfa1e, Aug 8 2012, 15:43:49) [GCC 4.0.1 (Apple Inc. build 5493)]
== Darwin-8.11.0-Power_Macintosh-powerpc-32bit big-endian
== /private/tmp/test_python_13864
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1)
[...]
======================================================================
FAIL: testChainingDescriptors (test.test_exceptions.ExceptionTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_exceptions.py", line 432, in testChainingDescriptors
 self.assertTrue(e.__suppress_context__)
AssertionError: False is not true
----------------------------------------------------------------------
Other similar test failures include multiple test cases in test_ipaddress, test_raise, and test_traceback, for example:
======================================================================
FAIL: test_address_errors (test.test_ipaddress.NetworkTestCase_v6)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/ipaddress.py", line 1580, in _ip_int_from_string
 ip_int |= self._parse_hextet(parts[i])
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/ipaddress.py", line 1605, in _parse_hextet
 raise ValueError("Only hex digits permitted in %r" % hextet_str)
ValueError: Only hex digits permitted in 'axy'
During handling of the above exception, another exception occurred:
ipaddress.AddressValueError: Only hex digits permitted in 'axy' in '1234:axy::b'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_ipaddress.py", line 439, in test_address_errors
 assertBadAddress("1234:axy::b", "Only hex digits")
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_ipaddress.py", line 432, in assertBadAddress
 self.factory(addr)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/contextlib.py", line 66, in __exit__
 self.gen.throw(type, value, traceback)
 File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_ipaddress.py", line 50, in assertCleanError
 self.assertTrue(exc.exception.__suppress_context__)
AssertionError: False is not true
The same universal build runs without error on an Intel Mac with the same os version. The ppc failures are seen on both PPC OS X 10.5 and 10.4 systems.

It appears similar failures are occuring on Sparc platforms (see issue15589) another big-endian platform.

Does this fix it?

__suppress_context__ is a member using T_BOOL type. T_BOOL expects the C type "char", whereas the field in the PyBaseExceptionObject is a C "int". Attached patch changes the type and should fix the issue.
The test fails because writing into the field uses:
 *(char*)field = value;
Which does not work in big endian if the field is a pointer to an int.

New changeset e2df976b8a33 by Benjamin Peterson in branch 'default':
use char instead of int to please T_BOOL (closes #15597)
http://hg.python.org/cpython/rev/e2df976b8a33 

The patch does indeed fix all of the __suppress_context__ related test failures previously seen, i.e. test_exceptions, test_ipaddress, test_raise, and test_traceback.