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[3.11] gh-95913: Consolidate build requirements changes in 3.11 WhatsNew (GH-98781) #102497

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Mar 22, 2023
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[3.11] gh-95913: Consolidate build requirements changes in 3.11 WhatsNew (GH-98781) #102497

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22 changes: 7 additions & 15 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -2116,30 +2116,22 @@ Build Changes
and WASI contributed by Christian Heimes in :gh:`90473`;
platforms promoted in :gh:`95085`)

* Building Python now requires:
* Building CPython now requires:

* A `C11 <https://en.cppreference.com/w/c/11>`_ compiler.
* A `C11 <https://en.cppreference.com/w/c/11>`_ compiler and standard library.
`Optional C11 features
<https://en.wikipedia.org/wiki/C11_(C_standard_revision)#Optional_features>`_
are not required.
(Contributed by Victor Stinner in :issue:`46656`.)
(Contributed by Victor Stinner in :issue:`46656`,
:issue:`45440` and :issue:`46640`.)

* Support for `IEEE 754 <https://en.wikipedia.org/wiki/IEEE_754>`_
floating point numbers.
(Contributed by Victor Stinner in :issue:`46917`.)

* Support for `floating point Not-a-Number (NaN)
<https://en.wikipedia.org/wiki/NaN#Floating_point>`_,
as the :c:macro:`!Py_NO_NAN` macro has been removed.
(Contributed by Victor Stinner in :issue:`46656`.)

* A `C99 <https://en.cppreference.com/w/c/99>`_
``<math.h>`` header file providing the
:c:func:`!copysign`, :c:func:`!hypot`, :c:func:`!isfinite`,
:c:func:`!isinf`, :c:func:`!isnan`, and :c:func:`!round` functions
(contributed by Victor Stinner in :issue:`45440`);
and a :c:data:`!NAN` constant or the :c:func:`!__builtin_nan` function
(Contributed by Victor Stinner in :issue:`46640`).
* The :c:macro:`!Py_NO_NAN` macro has been removed.
Since CPython now requires IEEE 754 floats, NaN values are always available.
(Contributed by Victor Stinner in :issue:`46656`.)

* The :mod:`tkinter` package now requires `Tcl/Tk <https://www.tcl.tk>`_
version 8.5.12 or newer.
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