Add What's New & compatibility warnings

Author: encukou

Doc/c-api/init.rst

@@ -1557,6 +1557,16 @@ All of the following functions must be called after :c:func:`Py_Initialize`.
 
    .. versionadded:: next
 
+      .. warning::
+
+         This function was added in a bugfix release, and
+         extensions that use it will be incompatible with Python 3.14.0.
+         Most packaging tools for Python are not able to handle this
+         incompatibility automatically, and will need.
+         When using PyPA standards (wheels and source distributions),
+         specify ``Requires-Python: != 3.14.0.*`` in
+         `core metadata <https://packaging.python.org/en/latest/specifications/core-metadata/#requires-python>`_.
+
 
 .. c:function:: void PyUnstable_ThreadState_ResetStackProtection(PyThreadState *tstate)
 
@@ -1567,6 +1577,16 @@ All of the following functions must be called after :c:func:`Py_Initialize`.
 
    .. versionadded:: next
 
+      .. warning::
+
+         This function was added in a bugfix release, and
+         extensions that use it will be incompatible with Python 3.14.0.
+         Most packaging tools for Python are not able to handle this
+         incompatibility automatically, and will need.
+         When using PyPA standards (wheels and source distributions),
+         specify ``Requires-Python: != 3.14.0.*`` in
+         `core metadata <https://packaging.python.org/en/latest/specifications/core-metadata/#requires-python>`_.
+
 
 .. c:function:: PyInterpreterState* PyInterpreterState_Get(void)
 

Doc/whatsnew/3.14.rst

@@ -3435,3 +3435,13 @@ Changes in the C API
   functions on Python 3.13 and older.
 
 .. _pythoncapi-compat project: https://github.com/python/pythoncapi-compat/
+
+
+Notable changes in 3.14.1
+=========================
+
+* Add :c:func:`PyUnstable_ThreadState_SetStackProtection` and
+  :c:func:`PyUnstable_ThreadState_ResetStackProtection` functions to set
+  the stack protection base address and stack protection size of a Python
+  thread state.
+  (Contributed by Victor Stinner in :gh:`139653`.)