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BP compatibility: 2.5.0 cannot read master data #2242

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ax3l opened this issue May 13, 2020 · 5 comments
Closed

BP compatibility: 2.5.0 cannot read master data #2242

ax3l opened this issue May 13, 2020 · 5 comments

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@ax3l
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ax3l commented May 13, 2020

An INCITE user of ours reports that a double attribute written with ADIOS2 master is not read with the same data type again in v2.5.0, which causes us read problems.

Describe the bug
A user writes an attribute with openPMD-api master with a double type via ADIOS2.
Reading with ADIOS2 v2.5.0 does not re-identify the type.

To Reproduce
Are there unit tests in ADIOS2 that check if old BP4 files are represented well in reads of never versions of ADIOS2?

Expected behavior
Which compatibility guarantees do we have for both APIs and BP file format?

Desktop (please complete the following information):

  • OS/Platform: Summit (write) and Rhea (read) at OLCF
  • Build: parallel write from C++11 API in ADIOS2 master from source; serial read via ADIOS2 2.5.0 (conda-forge, C++17 build)

Additional context
This could be caused by newly introduced data types for attributes and complex. I tried to take care that enum types/numbers in the API stay the same, but am not sure if I succeeded or what is done on the BP level. #1909 Could also be any other type change introduced in ADIOS2 since 2.5.0.

I am basically writing this to avoid that a data incompatibility sneaks into the next stable release.

@ax3l ax3l changed the title BP compatibility: master cannot read 2.5.0 data BP compatibility: 2.5.0 cannot read master data May 13, 2020
@williamfgc
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@ax3l thanks for reporting this. Is the user checking with bpls to verify the metadata is correct? Please let us know as this has a major impact. @chuckatkins @pnorbert are there plans for adding regression testing functionality among versions?

@ax3l
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ax3l commented May 14, 2020

Thanks, I am investigating this right now myself. I can read the data with bpls -A -l from 2.5.0 which makes me suspect I am having a logic issue on my side in openPMD. Will try to build a reproducer, the problems is currently on a 4 TByte data set ;-)

@chuckatkins
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Related #2255 and #2257

@ax3l
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ax3l commented May 15, 2020

Thanks a lot!
I found and fixed a parser issue on our side today and we switched all to 2.5.0 to keep the user going.

We saw an intermediate issue not being able to parse a string attribute from master in 2.5.0, which I have not followed down yet. I'll have to repeat the read check just to make 100% sure it's not master related, but looks like #2255 would cover these cases generally, which is superb. Thanks already!

@ax3l
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ax3l commented May 15, 2020

The last issue was not master related per se but generally occurred in a write in which a writing app was aborted while reaching the walltime.

bpls still shows a (global) attribute that was written by some of the ranks, maybe probably not all due to the sigkill, yet serial reads fail with the attribute being of unknown type (or potentially being missing in some PGs). Interesting that bpls sees it though... anyway, since it's incomplete data I will just have to handle this more gracefully.

@ax3l ax3l closed this as completed May 15, 2020
chuckatkins pushed a commit to chuckatkins/ADIOS2 that referenced this issue Oct 30, 2020
Code extracted from:

    https://github.com/pybind/pybind11.git

at commit 06a54018c8a9fd9a7be5f5b56414b5da9259f637 (master).

Upstream Shortlog
-----------------

Ahmed Sobhy (1):
      8d8d48c5 fix: do not use abi::__forced_unwind with libc++, even with gcc instead of clang (ornladios#2569)

Andrew J. Hesford (1):
      a3118130 pytypes.h: fix docs generation (ornladios#2220)

Andrey Dorozhkin (1):
      1817d211 Disable defining (v)snprintf as macro in modern Visual Studio

Ashley Whetter (1):
      8e85fadf Render `py::none` as `None` in docstrings

Axel Huebl (2):
      a6355b00 CMake: Add Python 3.8 to pybind11Tools (ornladios#1974)
      6ebfc4b2 Document CMAKE_CXX_STANDARD

B Krishna Chaitanya (1):
      71442438 Refactor: Extract Custom Type Casts related tests

Baljak (2):
      07e22593 Fix compilation with MinGW only (ornladios#2053)
      4f72ef84 Fix the use of MSVC in an MSYS environment (ornladios#2087)

Bjorn (1):
      d4d7ef5d Update pybind11Tools.cmake (ornladios#2419)

Boris Staletic (14):
      fe2a06e3 Pin breathe to 4.13.1
      dc9006db Use newer macOS image for python3 testing
      1376eb0e Free tstate on python 3.7+ on finalize_interpreter (ornladios#2020)
      ae2ee2a4 Avoid using deprecated API in python 3.9
      b2f52225 Rename embedded_module object's name (ornladios#2282)
      8b9eb964 Check for NULL in raw_str on Python3 (ornladios#2290)
      aa982e13 Small fixes in numpy.h (ornladios#2293)
      441e7770 Use new style __init__ in numpy docs (ornladios#2316)
      2819ce64 Avoid attr("__repr__") in initialize_generic (ornladios#2317)
      cc982ac1 fix: allow assignment of time points of resolutions other than that of a system clock (ornladios#2481)
      32bb9071 Avoid C-style casts for pointers in docs (ornladios#2487)
      d3c999c7 fix: rename `pybind11::module` to `pybind11::module_` (ornladios#2489)
      5ebc7816 Allow raw unions without base classes in is_accessible_base_of (ornladios#2320)
      4038542b Remove friend declaration of py::class_ in py::detail::generic_type (ornladios#2613)

Charles Brossollet (1):
      0f1d3bfe Add FAQ entry for dealing with long functions interruption (ornladios#2000)

Chuck Atkins (1):
      d730fbc0 Utilize CMake's language standards abstraction when possible

Ciro Santilli (1):
      b47efd35 Use defined for some preprocessor variables that might be undefined (ornladios#2476)

Clemens Sielaff (1):
      63df87fa Add lvalue ref-qualified cpp_function constructors (ornladios#2213)

Daniel Saxton (1):
      fb0a3a0e Fix broken README link (ornladios#2449)

Dariusz Suchojad (1):
      bed9080c  docs: Updated the link to the PDF docs (ornladios#2603) (ornladios#2605)

David Stone (1):
      5088364b Declare `operator==` and `operator!=` member functions const.

David Vo (1):
      5e6ec496 Add enum value to enum repr (ornladios#2126)

Dekken (1):
      1abc4a9d fix: doc typo, drop second use of 'without' (ornladios#2439)

Dustin Spicuzza (4):
      0dfffcf2 Add is_final to disallow inheritance from Python
      2c4cd841 Add AutoWIG to list of binding generators (ornladios#1990)
      1b0bf352 Throw TypeError when subclasses forget to call __init__ (ornladios#2152)
      6f3470f7 Add robotpy-build to list of tools (ornladios#2359)

Eric Cousineau (10):
      baf69345 Minor modifications to interrupt handling FAQ (ornladios#2007)
      2c30e0a1 cmake: Expose `PYBIND11_TEST_OVERRIDE` (ornladios#2218)
      53095730 operators: Move hash check to before mutations, tweak whitespace
      4e3d9fea operators: Explicitly expose `py::hash(py::self)`
      ebdd0d36 tests: Consolidate version (2 vs. 3) and platform (CPython vs. PyPy) checks (ornladios#2376)
      5a3ff723 ci: Remove "Setup Boost (macOS)" step (ornladios#2395)
      44fa79ca pytypes: Add Gotchas section about default-constructed wrapper types and py::none() (ornladios#2362)
      4e7c08da test_numpy_dtypes: Add test for py::vectorize() (ornladios#2260)
      d74be321 tests: Fix test override execution (ornladios#2512)
      c513b5e3 tests(CMakeLists): robustify against add'l versions of Boost (ornladios#2608)

Erick Matsen (1):
      b32b762c Fixing minor typo in basics.rst (ornladios#1984)

Florian Apolloner (1):
      fe1392d0 Silence Clang 10 compiler warnings. Fixes ornladios#2225. (ornladios#2294)

Francesco Biscani (2):
      deb3cb23 Add exception translation for std::overflow_error. (ornladios#1977)
      bd24155b Aligned allocation fix for clang-cl (ornladios#1988)

Fritz Reese (1):
      e8ad33bb Fix buffer_info for ctypes buffers (pybind#2502) (ornladios#2503)

Griffin Downs (1):
      a4cee36b Add vcpkg installation instructions (ornladios#1936)

Guilherme Dantas (1):
      8908552d typo

Hans Dembinski (2):
      c27a6e13 make builds with python tests and cpp tests fail if either one fails (ornladios#1967)
      bdf6a5e8 Report type names in return value policy-related cast exceptions (ornladios#1965)

Henry Fredrick Schreiner (2):
      11f756f5 fix: type bug intruduced in ornladios#2492
      e3774b76 tests: the condition was too look on xfail

Henry Schreiner (151):
      a38e5331 Fix CI, prepare test on Python 3.9 beta (ornladios#2233)
      d8c7ee00 ci: GHA basic format & pre-commit (ornladios#2309)
      ef057f12 test: support pypy2 7.3
      3d20b73e test: pass through C++ std for cmake test
      49007b7f test: fix warning/error on Python 2 in 14/17 mode
      a59c6de8 test: allow MSVC/Xcode to run the embed test
      73dc9786 style: avoid adding virtual environment directories
      b16347e5 ci: enable GHA testing
      8b0ccf76 style: adding pre-commit check-style.sh
      5c936d4b refactor: issue fixed upstream
      6f3e5e38 ci: keep travis from running twice
      6a80171c ci: Add clang builds & C++17
      e428a7f6 ci: fix clang warnings
      1f53c373 fix: C++17 mode on Clang may error
      44706717 fix: too many braces on clang 3.6
      5927c581 chore: update Catch
      aab70139 ci: cache, build wheels on macOS PyPy3
      78069057 ci: trim down Appveyor
      9521bc56 ci: drop parts from Travis
      1b880dfd ci: download EIGEN
      2ee1bcd9 ci: add GHA badge
      2fbbd510 ci: add gcc
      e450ea05 ci: add docker build to GHA
      249a13bd ci: move docs check to GHA
      ff39ad3f ci: include scipy for tests
      88b3e5c6 ci: nicer naming scheme
      a6324868 ci: Windows 2016 test
      c51b3f43 ci: change caching
      1491c94c ci: cmake Configure test (ornladios#2327)
      6ec1775f feat: drop CMake 3.6 and below, modernize CMake
      1b92cd17 fix: address review points from @YannickJadoul
      f64d5aa6 fix: typo for warning on C++17, support Win + 2.7
      1651c324 update: address review points
      e2a96890 format: add cmake-format to pre-commit
      94db5c5e format: apply cmake-format
      b8047245 fix: uninstall cleanup (ornladios#2346)
      1caf1d06 fix: check list validity and add missing file (ornladios#2352)
      df115977 chore: cleanup
      da803eb0 fix: duplicate target names removed
      ed6de125 format: include .in files
      c664d557 ci: better output / more config
      227170dc fix: better handling of PYBIND11_CPP_STANDARD
      0af7fe6c fix: typo in pybind11_add_module (ornladios#2374)
      f7abac66 fix: boost's include dir was listed first (ornladios#2384)
      1534e17e ci: include Python 3.9 RC1 (ornladios#2387)
      2e2de8c8 fix: add missing signature (ornladios#2363)
      cba4a985 ci: include Boost (ornladios#2393)
      a876aac2 tests: loosen test, not valid on some systems (ornladios#2399)
      4d9024ec tests: cleanup and ci hardening (ornladios#2397)
      64040997 docs: contrib/issue templates (ornladios#2377)
      cf0a6459 fix: throwing repr caused a segfault (ornladios#2389)
      1729aae9 feat: new FindPython support (ornladios#2370)
      04fdc44f tests: avoid putting build products into source directory (ornladios#2353)
      24dffe46 fix: PYBIND11_MASTER_PROJECT always ON (ornladios#2412)
      110e6c12 ci: reduce flakiness a little (ornladios#2418)
      a6887b60 docs: update changelog and versionadded
      2fa18431 docs: pin versions for readthedocs
      f31df738 docs: move CONTRIBUTING (ornladios#2402)
      56df3c46 fix: a couple more places where pybind11 is missing 11 (ornladios#2421)
      c58f7b74 fix: reduce target collision in add_submodule mode (ornladios#2423)
      5b59b7b2 ci: gha annotations (ornladios#2427)
      9b8cb020 fix: respect PYTHON_VERSION if set in classic mode (ornladios#2414)
      3a89bffa ci: harden chrono test, mark another macos 4.9 dev failure (ornladios#2448)
      72b06b86 ci: Eigen moved
      0dbda6e8 feat: py::pos_only (ornladios#2459)
      ce1a07ef fix: use classic extension handling unless otherwise requested (ornladios#2462)
      37f845a1 ci: disallow some common capitalization mistakes (ornladios#2472)
      621906b3 fix: support nvcc and test (ornladios#2461)
      f12ec00d feat: py::type::of<T>() and py::type::of(h) (ornladios#2364)
      8dc31c7b style: clang-tidy: llvm-namespace-comment
      5dfbe6f9 style: clang-tidy: modernize-use-override
      96e6a8d5 style: clang-tidy: readability-container-size-empty
      b342c373 style: clang-tidy: modernize-use-using
      b491b465 style: clang-tidy: modernize-use-equals-default
      ce88e940 style: clang-tidy: modernize-use-auto
      4d786408 style: clang-tidy: modernize-use-emplace
      e7bafc8e style: clang-tidy: default checks and fix bug in iostream deconstruction
      dabbbf31 fix: use OVERRIDE instead of OVERLOAD (ornladios#2490)
      41aa9260 refactor: replace .get_type with type::handle_of (ornladios#2492)
      fd61f503 feat: setup.py redesign and helpers (ornladios#2433)
      e37921d7 refactor: drop mkdoc and update changelog (ornladios#2491)
      dec33c29 docs: installing section (ornladios#2494)
      99ef2b84 docs: read version from pybind11 file (ornladios#2496)
      81555ce6 docs: Use README.rst in docs as home page (ornladios#2500)
      54831a9a fix: use svg to pdf converter instead of original solution
      d753b769 docs: corrected link to documentation
      8fa70e74 ci: fix broken documenation test (works on RtD) (ornladios#2506)
      87828c7e fix: typo in Windows C++17 support (ornladios#2507)
      4a288ab9 fix: Windows C++ latest (ornladios#2508)
      d0ed035c fix: AppleClang 12 warnings (ornladios#2510)
      e01f4924 fix: Add a nice CMake error when Interpreter component is missing. (ornladios#2519)
      3c7ef56b fix: warning on latest AppleClang (ornladios#2522)
      82dbc5b7 ci: releases (ornladios#2530)
      21902462 chore: bump to 2.6.0b1, beta release
      0fc5774c fix: beta does not have a dot in front (ornladios#2539)
      1994691a ci: download artifact issue
      319b9964 fix: metadata was adding quotes to distinfo
      01ad8920 ci: publish in two steps
      6d2d08db fix: conda-forge patch (ornladios#2540)
      b9d00273 feat: parallel compiler (ornladios#2521)
      5f9b1667 ci: label PRs with changelog needed (ornladios#2546)
      1bcd5f0a Update pr_merged.yml
      ca4127ce ci: fix labeler
      3488494a refactor: import check as a common function (ornladios#2526)
      560ed3e3 docs: fix odd spacing
      6bcd220c refactor: module -> module_ with typedef (ornladios#2544)
      2a2f5220 fix: find_import didn't work properly for classic tools (ornladios#2550)
      9a0c96dd feat: py::prepend tag (ornladios#1131)
      00edc300 fix: PYBIND11_OBJECT required pybind11 namespace (regression) (ornladios#2553)
      b6f37f67 docs: minor cleanup (ornladios#2555)
      49c389b7 ci: test on Windows 3.8 and 3.9 (mostly) (ornladios#2560)
      deba040b test: hide segfault (ornladios#2559)
      e4e5c49a docs: known issues (ornladios#2565)
      fae45325 ci: fix labeler
      f385eccd chore: bump to 2.6.0rc1
      c02f0ec6 fix: formatting issue
      fecef388 refactor: simpler followup to ornladios#2569 (ornladios#2572)
      d46f3322 fix: allow cmake varibles from Python calls to be cached (ornladios#2570)
      7d7309b8 ci: monitor dependencies
      cd2c25a2 ci: adjust labeler match pattern
      4f45052d ci: fix ci label
      993495c9 fix: Intel 18+ required (ornladios#2577)
      ae2e5a36 ci: try to get labeler to add needs changelog
      2f746eee ci: original labeler
      7c71dd38 ci: inverted labeler logic
      edda89ba fix: install to DATAROOTDIR instead of hardcoding share (ornladios#2584)
      c99d7f1c docs: PR template (ornladios#2580)
      2a263e08 docs: some final 2.6.0 updates (ornladios#2582)
      526a7733 ci: merged labels still missing
      a8c2e3ee fix: ipo should be off for debug or relwithdebinfo (ornladios#2590)
      645d8381 feat: typing support for helpers (ornladios#2588)
      c4a8b5bb chore: bump to 2.6.0rc2
      63f2deea chore: update Eigen
      f2008325 style: ssize_t -> py::ssize_t
      b72c79f9 fix: std::is_pod -> pybind11::detail::is_pod
      9ac604a3 fix: PyPy windows issue
      6bb71c48 fix: more intp asserts, reinterpret_cast
      ad2fe0ee fix: pypy3 windows extension issue
      a4221153 fix: new line in PYPY_VERSION
      8ae11fbf ci: add more runs
      2e31e466 docs: update for PyPy win 32 issue
      c50f90ec style: use Black everywhere (ornladios#2594)
      064362fb fix: allow the ABI string to be forced (ornladios#2602)
      c16da993 chore: bump to 2.6.0rc3
      09056717 fix: much better pdf (ornladios#2604)
      0b9acc40 fix: chapters in PDF again (ornladios#2606)
      120e2e21 docs: tiny typo
      4d037439 fix: missing identifier for Python 3.9
      ace4deb4 ci: add more jobs (ornladios#2610)
      139c05da ci: test on NumPy + Python 3.9 (ornladios#2628)
      06a54018 fix: min macos (ornladios#2622)

Holger Kohr (1):
      fbc75636 Add py::object casting example to embedding docs (ornladios#2466)

Hyrum Wright (1):
      961b2e62 fix: ensure the GIL is held when copying a function. (ornladios#2545)

Isuru Fernando (3):
      37352491 Install headers using both headers and package_data (ornladios#1995)
      e107fc2a Fix setuptools record of headers
      0d70f0e1 PyPy3 support (ornladios#2146)

JGamache-autodesk (1):
      37d04abd Fixes ornladios#1295: Handle debug interpreter (ornladios#2025)

James R. Barlow (1):
      3618bea2 Add and document py::error_already_set::discard_as_unraisable()

Jason Rhinelander (1):
      be0d8045 Support keyword-only arguments

Jay Soffian (1):
      01453b05 fix (setup_helpers): fix bug in _add_lflags (ornladios#2586)

Jeremy Nimmer (1):
      759221f5 Obey __cpp_sized_deallocation and __cpp_aligned_new

Kota Yamaguchi (1):
      e2488698 Fix undefined memoryview format (ornladios#2223)

Liam Keegan (1):
      c4fd1fd9 CMake improvement: support windows python on msys (ornladios#2312)

Lin Hsu (1):
      d031efe7 Typo

MRocholl (3):
      00c462d1 find library path to libclang.so via glob command in /usr/lib/llvm-* and set it
      9358e30d change set_path to set_file
      b14aeb7c fix typo in sorted function call argument reverse

Mana Borwornpadungkitti (1):
      6edd0e6d fix: Reject keyword argument `None` with `.none(false)` (ornladios#2611)

Marcin Wojdyr (1):
      8e40e389 cast pointer to std::tuple and std::pair (ornladios#2334)

Matthew Dawkins (1):
      6f11347a Prevent cmake error when prefix empty (ornladios#1986)

Matthijs van der Burgh (1):
      b5240089 Deepcopy documentation (ornladios#2242)

Michael Goulding (1):
      fb042d69 Fix warning C26817 on copying in `for (auto vh : value_and_holder(...))` (ornladios#2382)

Mosalam Ebrahimi (1):
      7dd2bdb0 docs: fix typo (ornladios#2405)

Nicholas Musolino (1):
      02c83dba Propagate exceptions in sequence::size() (ornladios#2076)

Nils Berg (1):
      819802da Fix a memory leak when creating Python3 modules. (ornladios#2019)

Nils Leif Fischer (1):
      141e8cc0 Fix uninitialized-variables cmake warnings

Orell Garten (1):
      9ed8b440 Change __init__(self) to __new__(cls)

Paul Fultz II (1):
      69821d9e Disable testing when using BUILD_TESTING (ornladios#1682)

Ralf W. Grosse-Kunstleve (8):
      4697149d Allows users to specialize polymorphic_type_hook with std::enable_if.
      f6e543b1 Adding a default virtual destructor to Animal type in test_tagbased_polymorphic.cpp.
      96c67636 test_builtin_casters.py test_string_view: Python 2 c++17, c++2a compatibility. (ornladios#2314)
      17320463 Adding tests specifically to exercise pybind11::str::raw_str. (ornladios#2366)
      cd856992 Using recently added `pytest.PY2` instead of `str is bytes`. (ornladios#2396)
      3c061f21 Fixing `pybind11::bytes()` ambiguous conversion issue.
      d159a563 static allocation for PyModuleDef, to avoid leak check errors. (ornladios#2413)
      8290a5a0 clang -Wnon-virtual-dtor compatibility (ornladios#2626)

Riccardo Bertossa (1):
      6c29cbf8 misleading comment corrected (strides in buffer_info is bytes and not number of entries) (ornladios#1958)

Rickard Hallerbäck (1):
      5a8ec8e5 Include what is used in pybind11.h (ornladios#2499)

Riyaz Haque (1):
      2b6b98e2 Bugfix/Check actual value when deregistering pybind11 instance (ornladios#2252)

Robert Haschke (2):
      370a2ae2 Declare call_impl() as && (ornladios#2057)
      f2226aef Allow perfect forwarding of method args (ornladios#2048)

Sebastian Gsänger (1):
      a83d69e7 test pair-copyability on C++17 upwards (ornladios#1886)

Sebastian Koslowski (2):
      dc65d661 support for readonly buffers (ornladios#863) (ornladios#1466)
      a86ac538 rename args_kw_only to kwonly

Sergei Izmailov (7):
      22b25040 Render full numpy numeric names (e.g. numpy.int32)
      57070fb0 Render py::iterator/py::iterable as Iterator/Iterable in docstrings
      90d99b56 Render pybind11::array as numpy.ndarray in docstrings
      4f1531c4 Render `py::int_` as `int` in docstrings
      ab323e04 Test py::iterable/py::iterator representation in docstrings
      7b067cc3 Set __hash__ to None for types that defines __eq__, but not __hash__ (ornladios#2291)
      4c36fb7b [DOC] avoid C++ types in docstrings (ornladios#2441)

Simeon Ehrig (1):
      c776e9ef Fix compiler error with MSVC 17 and CUDA 10.2

Takahiro Ishikawa (1):
      3618807d Fix python.lib name

Thomas Köppe (3):
      eeb10448 [common.h] Mark entry point as "unused".
      1e14930d [common.h] Mark another entry point as "unused".
      f2e79986 [common.h] Mark another entry point as "unused". (ornladios#2625)

Valentin Boettcher (1):
      3be085d1 docs: typo prefix -> suffix (ornladios#2593)

Vemund Handeland (1):
      6e39b765 Add C++20 char8_t/u8string support (ornladios#2026)

Wenzel Jakob (22):
      dfde1554 begin working on next version
      61e4f118 numpy.h: minor preprocessor fix suggested by @chaekwan
      a6064822 Revert "numpy.h: minor preprocessor fix suggested by @chaekwan"
      fb910ae9 Revert "Fix a memory leak when creating Python3 modules. (ornladios#2019)"
      b4e5d582 undo #define copysign in pyconfig.h
      f9f3bd71 Use C++17 fold expressions when casting tuples and argument lists (ornladios#2043)
      2fda9d5d Travis CI fix (MacOS, Py3)
      4c206e8c bindings for import_error exception
      bf2b0314 Handle cases where binding code immediately throws py::error_already_set
      bb9c91cc pybind11Tools.cmake: search for Python 3.9
      3b1dbeba v2.5.0 release
      02348716 begin working on next version
      a54eab92 Revert "Change __init__(self) to __new__(cls)"
      8c0cd944 ignore another type of visual studio project file
      fc3a4490 Minor clarification (@AntoinePrv, ornladios#2083)
      36c666f0 pybind11_add_module(): OPT_SIZE target
      064a03a4 main CMakeLists.txt file: be less noisy
      3232e59b Check if module file extension could be queried correctly (ornladios#2538)
      2bc62dc8 updated credits
      7f9445a6 Thanks, Google!
      59a2ac27 v2.6.0 release
      86d3e9eb begin working towards a future v2.6.1 patch release

Wink Saville (1):
      7c26c718 Fix mispelling in basics.rst (ornladios#2614)

Yannick Jadoul (30):
      55ff4642 Fixing SystemError when nb_bool/nb_nonzero sets a Python exception in type_caster<bool>::load (ornladios#1976)
      805c5862 Adding method names to cpp_function constructor calls in enum_base
      d54d6d8c Adding pybind11::cast overload for rvalue references (ornladios#1260)
      f980d76d Change NAMESPACE_* macros into PYBIND11_NAMESPACE_* (ornladios#2283)
      964ab956 Fix DeprecationWarning about 'invalid escape sequence' in tools/docs Python scripts (ornladios#2281)
      3e448c0b Enable py::ellipsis on Python 2 (ornladios#2360)
      4493751a Fix new-style __init__ usage in numpy docs (ornladios#2426)
      b3d8fec0 Adapt code example in advanced/classes.rst to new handling of forgetting to call the superclass __init__ (ornladios#2429)
      43f390ad Add note that VS2017 requires /permissive- to build in C++17 mode (ornladios#2431)
      a2bb297b Throw exception on returning a unique_ptr or shared_ptr nullptr (or any other holder type) from py::init, rather than crashing (ornladios#2430)
      03b3d59d tests: fix CI by including <algorithm> to stop MSVC from complaining about std::count_if in tests/test_sequences_and_iterators.cpp (ornladios#2435)
      6a192781 Fix bug roundtripping datetime.time objects after midnight in eastern hemisphere timezones (ornladios#2417) (ornladios#2438)
      fe9ee86b Add check if `str(handle)` correctly converted the object, and throw py::error_already_set if not (bis) (ornladios#2477)
      9df13835 Stop py::array_t arguments from accepting arrays that do not match the C- or F-contiguity flags (ornladios#2484)
      d65e34d6 Resolve empty statement warning when using PYBIND11_OVERLOAD_PURE_NAME and PYBIND11_OVERLOAD_PURE (ornladios#2325)
      16f199f8 Change base parameter type in register_exception and exception constructor from PyObject* to handle (ornladios#2467)
      c72708a7 Moving tp_class access, and consistent fully-qualified naming for PyPy, to detail::get_tp_name (ornladios#2520)
      07b069a5 Unify Python 2 & 3 py::module constructor, and make contructor with pre-allocated PyModuleDef private (ornladios#2534)
      56784c4f Add unchecked_reference::operator() and operator[] to overload resolution of unchecked_mutable_reference (ornladios#2514)
      9796fe98 feat: vectorize functions with void return type (ornladios#1969)
      b70894df docs: add std::valarray to docs/advanced/cast/stl.rst (ornladios#2547)
      14112077 chore: drop support for PyPy < 7.3.1 and clean up old PyPy workarounds (ornladios#2456)
      f537093a Fail on passing py::object with wrong Python type to py::object subclass using PYBIND11_OBJECT macro (ornladios#2349)
      71aea49b Check scope's __dict__ instead of using hasattr when registering classes and exceptions (ornladios#2335)
      0c5cc031 feat: deprecate public constructors of module_ class (ornladios#2552)
      1914b7d3 Shorten PYBIND11_EMBEDDED_MODULE macro implementation by using PYBIND11_CATCH_INIT_EXCEPTIONS (ornladios#2579)
      99773fc5 fix: throw error_already_set in py::len on failing PyObject_Length (ornladios#2575)
      493649f9 fix: valgrind-detected after-freeing access of PyMethodDef (macOS Python 3.9.0 segfaults) (ornladios#2576)
      6364b732 fix: test_factory_constructors.py failure triggered by test_register_duplicate_class (ornladios#2564)
      3a37d338 Add __builtins__ to globals argument of `py::exec` and `py::eval` if not present (ornladios#2616)

acxz (1):
      6f6e9394 feat: add uninstall target for CMake (ornladios#2265)

andriish (2):
      38370a87 fix: support NVIDIA-PGI HPC SDK (ornladios#2475)
      59323a97 ci: update PGI to 20.9 (ornladios#2566)

fatvlady (4):
      a3daf87d Add failing optional test
      556277d6 Fix optional dereference type deduction
      8c06b954 Fix compile error on GCC4.8
      f99ff736 Add additional check to be more compliant with other casters

fwjavox (1):
      e97c735f stl_bind: add binding for std::vector::clear (ornladios#2074)

jbarlow83 (3):
      4d90f1a1 Add error_scope to py::class_::dealloc() to protect destructor calls (ornladios#2342)
      b8863698 Improve documentation of Python and C++ exceptions (ornladios#2408)
      49cdb70a docs: use sorted(glob()) in example setup.py (ornladios#2561)

marc-chiesa (1):
      830adda8 Modified Vector STL bind initialization from a buffer type with optimization for simple arrays (ornladios#2298)

methylDragon (1):
      d96c3451 Fix docs typo

michalsustr (1):
      3bd0d7a8 Add note about specifying custom base class for Exceptions. (ornladios#2465)

nicolov (1):
      de5a29c0 Fix build with -Wmissing-prototypes (ornladios#1954)

peter (1):
      03f9e4a8 Fix compilation with clang-cl

tuxmaster5000 (1):
      7e0a4fb7 Fix for ornladios#2168 (ornladios#2299)

xkszltl (1):
      134a2ec3 Add `.git` suffix to URL because only GitHub itself works without it. (ornladios#2319)
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