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bpo-36722: Add What's New entry for debug ABI (GH-12957)

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Victor Stinner 2019-04-26 17:56:44 +02:00 committed by GitHub
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Doc/whatsnew/3.8.rst
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@ -98,6 +98,30 @@ subdirectories).
(Contributed by Carl Meyer in :issue:`33499`.)
Debug build uses the same ABI as release build
-----------------------------------------------
Python now uses the same ABI when built in release and in debug mode. On Unix,
when Python is build in debug mode, it is now possible to load C extensions
built in release mode and C extensions built using the stable ABI.
Release build and debug build are now ABI compatible: the ``Py_DEBUG`` define
no longer implies the ``Py_TRACE_REFS`` define which introduces the only ABI
incompatibility. A new ``./configure --with-trace-refs`` build option is now
required to get ``Py_TRACE_REFS`` define which adds :func:`sys.getobjects`
function and :envvar:`PYTHONDUMPREFS` environment variable.
(Contributed by Victor Stinner in :issue:`36465`.)
On Unix, C extensions are no longer linked to libpython. It is now possible to
load a C extension built using a shared library Python
with a statically linked Python.
(Contributed by Victor Stinner in :issue:`21536`.)
On Unix, when Python is built in debug mode, import now also looks for C
extensions compiled in release mode and for C extensions compiled with the
stable ABI.
(Contributed by Victor Stinner in :issue:`36722`.)
Other Language Changes
======================