Ok. 3.0.alpha6 with gcc 4.3 is down to the following doctest failure:
sage -t devel/sage/sage/rings/real_double.pyx
**********************************************************************
File "/home/mabshoff/sage-3.0.alpha5/tmp/real_double.py", line 544:
sage: a = -RDF(1)/RDF(0); a.str()
Expected:
'-inf'
Got:
'inf'
**********************************************************************
File "/home/mabshoff/sage-3.0.alpha5/tmp/real_double.py", line 979:
sage: a.is_positive_infinity()
Expected:
False
Got:
True
**********************************************************************
File "/home/mabshoff/sage-3.0.alpha5/tmp/real_double.py", line 991:
sage: a.is_negative_infinity()
Expected:
True
Got:
False
**********************************************************************
This is caused by GSL relying on the system's isinf() function which
is either buggy or did change behaviours, i.e. isinf(-1/0) is supposed
to be "-inf", while on OSX 10.5 with GSL 1.10 that case returns "inf".
I did discuss this with Justin Walker at SD7, but then I never
followed up whether this is the correct behavior or not. Interestingly
enough GSL's isinf() function [that is used as a fallback in case the
system doesn't provide it] returns "-inf" for "isinf(-1/0)".
The patch is simple enough by "fixing" GSL.
Thoughts?
Cheers,
Michael
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