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Merge branch 'master' into smart_holder

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Ralf W. Grosse-Kunstleve
2021-07-15 15:05:40 -07:00
parent 6d1026763a 4359e00b97
commit 1f04229733
7 changed files with 70 additions and 31 deletions
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20
docs/limitations.rst
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@@ -57,16 +57,16 @@ clean, well written patch would likely be accepted to solve them.
Python 3.9.0 warning
^^^^^^^^^^^^^^^^^^^^
Combining older versions of pybind11 (< 2.6.0) with Python on 3.9.0 will
trigger undefined behavior that typically manifests as crashes during
Combining older versions of pybind11 (< 2.6.0) with Python on exactly 3.9.0
will trigger undefined behavior that typically manifests as crashes during
interpreter shutdown (but could also destroy your data. **You have been
warned**).
This issue has been
`fixed in Python <https://github.com/python/cpython/pull/22670>`_. As a
mitigation until 3.9.1 is released and commonly used, pybind11 (2.6.0 or newer)
includes a temporary workaround specifically when Python 3.9.0 is detected at
runtime, leaking about 50 bytes of memory when a callback function is garbage
collected. For reference; the pybind11 test suite has about 2,000 such
callbacks, but only 49 are garbage collected before the end-of-process. Wheels
built with Python 3.9.0 will correctly avoid the leak when run in Python 3.9.1.
This issue was `fixed in Python <https://github.com/python/cpython/pull/22670>`_.
As a mitigation for this bug, pybind11 2.6.0 or newer includes a workaround
specifically when Python 3.9.0 is detected at runtime, leaking about 50 bytes
of memory when a callback function is garbage collected. For reference, the
pybind11 test suite has about 2,000 such callbacks, but only 49 are garbage
collected before the end-of-process. Wheels (even if built with Python 3.9.0)
will correctly avoid the leak when run in Python 3.9.1, and this does not
affect other 3.X versions.

3
docs/requirements.txt
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@@ -1,4 +1,7 @@
breathe==4.26.1
# docutils 0.17 breaks HTML tags & RTD theme
# https://github.com/sphinx-doc/sphinx/issues/9001
docutils==0.16
sphinx==3.3.1
sphinx_rtd_theme==0.5.0
sphinxcontrib-moderncmakedomain==3.17