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vstinner merged 2 commits into from
Apr 26, 2019
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bpo-36722: Add What's New entry for debug ABI #12957

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bpo-36722: Add What's New entry for debug ABI
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24 changes: 24 additions & 0 deletions Doc/whatsnew/3.8.rst
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Expand Up @@ -98,6 +98,30 @@ subdirectories).

(Contributed by Carl Meyer in :issue:`33499`.)

Debug build uses the same ABI than release build
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Python now uses the same ABI when built in release or 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
======================
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