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GH-123299: Copyedit 3.14 What's New: Build Changes #138488

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91 changes: 67 additions & 24 deletions Doc/whatsnew/3.14.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,7 @@ and improvements in user-friendliness and correctness.
* :ref:`PEP 741: Python configuration C API <whatsnew314-pep741>`
* :ref:`PEP 750: Template strings <whatsnew314-pep750>`
* :ref:`PEP 758: Allow except and except* expressions without parentheses <whatsnew314-pep758>`
* :ref:`PEP 761: Discontinuation of PGP signatures <whatsnew314-pep761>`
* :ref:`PEP 761: Discontinuation of PGP signatures <whatsnew314-no-more-pgp>`
* :ref:`PEP 765: Disallow return/break/continue that exit a finally block <whatsnew314-pep765>`
* :ref:`Free-threaded mode improvements <whatsnew314-free-threaded-cpython>`
* :ref:`PEP 768: Safe external debugger interface for CPython <whatsnew314-pep768>`
Expand Down Expand Up @@ -2820,29 +2820,6 @@ CPython bytecode changes
(Contributed by Irit Katriel in :gh:`100239`.)


Build changes
=============

* GNU Autoconf 2.72 is now required to generate :file:`configure`.
(Contributed by Erlend Aasland in :gh:`115765`.)

* ``#pragma``-based linking with ``python3*.lib`` can now be switched off
with :c:expr:`Py_NO_LINK_LIB`. (Contributed by Jean-Christophe
Fillion-Robin in :gh:`82909`.)

.. _whatsnew314-pep761:

PEP 761: Discontinuation of PGP signatures
------------------------------------------

PGP signatures will not be available for CPython 3.14 and onwards.
Users verifying artifacts must use `Sigstore verification materials`_ for
verifying CPython artifacts. This change in release process is specified
in :pep:`761`.

.. _Sigstore verification materials: https://www.python.org/downloads/metadata/sigstore/


C API changes
=============

Expand Down Expand Up @@ -3120,6 +3097,72 @@ Removed
(Removed in :gh:`133079`, see also :gh:`130396`.)


Build Changes
=============

* GNU Autoconf 2.72 is now required to generate :file:`configure`.
(Contributed by Erlend Aasland in :gh:`115765`.)

* ``wasm32-unknown-emscripten`` is now a :pep:`11` tier 3 platform.
(Contributed by R. Hood Chatham in :gh:`127146`, :gh:`127683`, and :gh:`136931`.)

* ``#pragma``-based linking with ``python3*.lib`` can now be switched off
with :c:expr:`Py_NO_LINK_LIB`.
(Contributed by Jean-Christophe Fillion-Robin in :gh:`82909`.)

* CPython now enables a set of recommended compiler options by default
for improved security.
Use the :option:`--disable-safety` :file:`configure` option to disable them,
or the :option:`--enable-slower-safety` option for a larger set
of compiler options, albeit with a performance cost.

* The ``WITH_FREELISTS`` macro and ``--without-freelists`` :file:`configure`
option have been removed.

* The new :file:`configure` option :option:`--with-tail-call-interp`
may be used to enable the experimental tail call interpreter.
See :ref:`whatsnew314-tail-call` for further details.

* To disable the new remote debugging support, use the
:option:`--without-remote-debug` :file:`configure` option.
This may be useful for security reasons.

.. _whatsnew314-build_details:

:file:`build-details.json`
--------------------------

Installations of Python now contain a new file, :file:`build-details.json`.
This is a static JSON document containing build details for CPython,
to allow for introspection without needing to run code.
This is helpful for use-cases such as Python launchers, cross-compilation,
and so on.

:file:`build-details.json` must be installed in the platform-independent
standard library directory. This corresponds to the :ref:`'stdlib'
<installation_paths>` :mod:`sysconfig` installation path,
which can be found by running ``sysconfig.get_path('stdlib')``.

.. seealso::
:pep:`739` -- ``build-details.json`` 1.0 -- a static description file
for Python build details

.. _whatsnew314-no-more-pgp:

Discontinuation of PGP signatures
---------------------------------

PGP (Pretty Good Privacy) signatures will not be provided
for releases of Python 3.14 or future versions.
To verify CPython artifacts, users must use `Sigstore verification materials
<https://www.python.org/downloads/metadata/sigstore/>`__.
Releases have been signed using Sigstore_ since Python 3.11.

This change in release process was specified in :pep:`761`.

.. _Sigstore: https://www.sigstore.dev/


Porting to Python 3.14
======================

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