Roumen Petrov <bugtr...@roumenpetrov.info> added the comment:

The macro Py_IS_INFINITY don't work on linux. The test case(force-inf.c)
is attached. The result don't depend from optimisation flag.

isinf(x)=1
Py_IS_INFINITY(x)=0
Py_IS_INFINITY2(x)=1
isinf(x)=0
Py_IS_INFINITY(x)=0
Py_IS_INFINITY2(x)=0

Added file: http://bugs.python.org/file12358/force-inf.c

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<http://bugs.python.org/issue4575>
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