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bpo-36707: Document "m" removal from sys.abiflags (GH-14090)

(cherry picked from commit 7efc526)

Co-authored-by: Victor Stinner <>
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miss-islington and vstinner committed Jun 15, 2019
1 parent f78e66c commit 3fde750cc4e4057076650a92946ec1d492464799
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  1. +4 −0 Doc/library/sys.rst
  2. +16 −0 Doc/whatsnew/3.8.rst
@@ -16,6 +16,10 @@ always available.
On POSIX systems where Python was built with the standard ``configure``
script, this contains the ABI flags as specified by :pep:`3149`.

.. versionchanged:: 3.8
Default flags became an empty string (``m`` flag for pymalloc has been

.. versionadded:: 3.2

@@ -936,6 +936,22 @@ Optimizations
Build and C API Changes

* Default :data:`sys.abiflags` became an empty string: the ``m`` flag for
pymalloc became useless (builds with and without pymalloc are ABI compatible)
and so has been removed. (Contributed by Victor Stinner in :issue:`36707`.)

Example of changes:

* Only ``python3.8`` program is installed, ``python3.8m`` program is gone.
* Only ``python3.8-config`` script is installed, ``python3.8m-config`` script
is gone.
* The ``m`` flag has been removed from the suffix of dynamic library
filenames: extension modules in the standard library as well as those
produced and installed by third-party packages, like those downloaded from
PyPI. On Linux, for example, the Python 3.7 suffix
```` became
```` in Python 3.8.

* The header files have been reorganized to better separate the different kinds
of APIs:

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