STINNER Victor <[email protected]> added the comment:
The problem is in PyLong_FromDouble(): if (Py_IS_INFINITY(dval)) is evaluated
as false, whereas dval *is* infinity. Possible causes:
- Py_IS_INFINITY is not defined as "# define Py_IS_INFINITY(X) isinf(X)"
(issue with the pyconfig.h file?)
- the compiler replaces isinf(X) by something else (!?)
- isinf() is not called with the right argument (conversion between 32, 64
and/or 80 floats?)
- issue with the FPU mode (unlikely because in your ctypes test,
isinf(float("inf")) returns 1, and this test runs in the Python process)
Try to run python in gdb. Set a breakpoint on isinf() (or on
PyLong_FromDouble() and use step by step) to check that the function is really
called, and called with the "right" argument.
You may also try to replace Py_IS_INFINITY(dval) directly by isinf(dval) (or
simply if(1) :-)) in PyLong_FromDouble().
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Python tracker <[email protected]>
<http://bugs.python.org/issue12589>
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