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gh-95914: Add What's New item describing PEP 670 changes #98315

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Oct 17, 2022
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gh-95914: Add What's New item describing PEP 670 changes #98315

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b1a4d4c
Add item to C API porting section describing PEP 670 changes
CAM-Gerlach Oct 16, 2022
8fad67c
Apply requested changes from Victor and Kumar to PEP 670 section
CAM-Gerlach Oct 17, 2022
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11 changes: 11 additions & 0 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -1884,6 +1884,17 @@ New Features
Porting to Python 3.11
----------------------

* Some macros have been converted to static inline functions to avoid
`macro pitfalls <https://gcc.gnu.org/onlinedocs/cpp/Macro-Pitfalls.html>`_.
The change should be mostly transparent to users,
as the replacement functions will cast their arguments to the expected types
to avoid compiler warnings due to static type checks.
However, when the limited C API is set to >=3.11,
these casts are not done,
and callers will need to cast arguments to their expected types.
See :pep:`670` for more details.
(Contributed by Victor Stinner and Erlend E. Aasland in :gh:`89653`.)

* :c:func:`PyErr_SetExcInfo()` no longer uses the ``type`` and ``traceback``
arguments, the interpreter now derives those values from the exception
instance (the ``value`` argument). The function still steals references
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