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Building Python now requires a C99 <math.h> header file providing
isinf(), isnan() and isfinite() functions.

Remove the Py_FORCE_DOUBLE() macro. It was used by the
Py_IS_INFINITY() macro.

Changes:

* Remove Py_IS_NAN(), Py_IS_INFINITY() and Py_IS_FINITE()
  in PC/pyconfig.h.
* Remove the _Py_force_double() function.
* configure no longer checks if math.h defines isinf(), isnan() and
  isfinite().
194a952

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The Python C API

The C API is divided into three sections:

  1. Include/: Limited API
  2. Include/cpython/: CPython implementation details
  3. Include/internal/: The internal API

Information on changing the C API is available in the developer guide