[issue45440] [C API] Py_IS_INFINITY() macro doesn't work in the limited C API if isinf() is not defined

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The Py_FORCE_DOUBLE() macro was added in bpo-5724 by the change:

commit e05e8409e1b47a2c018ad8a67016546217165c60
Author: Mark Dickinson <dickinsm at gmail.com>
Date:   Mon May 4 13:30:43 2009 +0000

    Issue #5724: Fix cmath failures on Solaris 10.

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<https://bugs.python.org/issue45440>
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