Tim Peters added the comment:
The longobject.c warnings are almost certainly unrelated to the test_re crash.
If shifting right twice (adding parens for clarity):
(LONG_MAX >> PyLong_SHIFT) >> PyLong_SHIFT.
squashes the warnings, that would be a substantially clearer way to express the
intent than the
SIZEOF_LONG*CHAR_BIT-1 >= 2*PyLong_SHIFT
spelling. Adding a comment *explaining* the intent would be even better.
For the segfault issue, best guess is that it's a compiler optimization bug.
Not common as mud, or even as common as nuisance warnings, but not all that
rare either ;-)
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<http://bugs.python.org/issue24999>
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