chore(deps): update dependency pybind/pybind11 to v3.1.0

[renovate]

This PR contains the following updates:

Package	Update	Change
pybind/pybind11	minor	3.0.1 → 3.1.0

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Release Notes

pybind/pybind11 (pybind/pybind11)

v3.1.0: Version 3.1.0

Compare Source

New Features:

• Support for Python 3.8 was removed. The minimum supported version is now Python 3.9. #​6110

• Support for MSVC 2017 has been dropped. #​6110

• Changed strict-mode numeric conversions for PEP 484 compatibility: float now accepts int, and complex now accepts int and float. #​5879

• Small extra features added to the pybind11 command line tool based on python-config. #​4272

• Added subinterpreter_thread_state, an RAII wrapper that owns a reusable PyThreadState for a sub-interpreter, together with a subinterpreter_scoped_activate overload that activates it. This lets an OS thread re-enter one or more sub-interpreters without creating and destroying a PyThreadState on every activation. #​6073

• Add py::mod_gil_used() as replacement spelling to py::mod_gil_not_used(false). #​5797

Bug fixes:

• Fixed a crash in py::subinterpreter::create() when called without a current PyThreadState, which its documentation explicitly allows — for example from an embedder that ended initialization with PyEval_SaveThread(), or from a worker thread that has never touched Python. error_scope is now constructed after a thread state has been attached instead of before. #​6127

• Make py::print delegate to the current frame/interpreter built-ins print entry, fixing handling of sys.stdout = None, following the active runtime's stream, keyword, and error semantics, and remaining a no-op if the entry is unavailable during teardown. #​6121

• Include the builtin complex type in the input annotation of the std::complex<T> type caster. #​6113

• String views (e.g. std::string_view) are now kept alive only when loaded from a transient source (such as a generator), fixing both a use-after-free and a regression where casting a view from a durable object outside a bound function would throw. #​6096

• Drop Python 2 prepend to evaluated source, causing errors to be off by one. #​6089

• Fix data race on last_storage_ptr_ cache in gil_safe_call_once_and_store. #​6087

• Allow user defined __str__ on enum_. #​6078

• Fix generated Callable type annotations for Python callbacks passed into C++ by inverting the callback's argument/return I/O context relative to the enclosing function signature. #​6055

• Correct __delitem__ for negative-step slices and re-enable contiguous erase fast path. #​6088

• Do not pass -fno-fat-lto-objects to GCC on macOS, which made all LTO probes fail and silently disabled LTO. #​6114

• Fixed cross-compilation to Emscripten/Pyodide with CMake ≥ 4.1 by no longer overriding an explicitly set PYBIND11_USE_CROSSCOMPILING when CMAKE_CROSSCOMPILING_EMULATOR is defined. #​6094

• Unset stale PYTHON_MODULE_DEBUG_POSTFIX and correct USE_PYTHON_INCLUDE_DIR variable. #​6086

• Apply -undefined dynamic_lookup to all Apple platforms. #​6075

Internal:

• Improved py::enum_ operator performance by restoring type-specific implementations. #​5887

• Optimized internal std::unordered_map/std::unordered_set hashing paths with noexcept. #​5960

CI:

• Test Python 3.15 in CI. #​6107

• Updated the CIBW test workflow to cibuildwheel v4.1 and bumped the Pyodide build to 314. #​6095

v3.0.4: Version 3.0.4

Compare Source

Bug fixes:

• Fixed test builds with installed Eigen 5 by improving Eigen3 CMake package detection.
  #​6036

• Fixed move semantics of scoped_ostream_redirect to preserve buffered output and avoid crashes when moved redirects restore stream buffers.
  #​6033

• Fixed py::dynamic_attr() traversal on Python 3.13+ to correctly propagate PyObject_VisitManagedDict() results.
  #​6032

• Fixed std::shared_ptr<T> fallback casting to avoid unnecessary copy-constructor instantiation in reference_internal paths.
  #​6028

CI:

• Updated setup-uv to the maintained GitHub Action tag scheme.
  #​6035

• Updated pre-commit hooks.
  #​6029

• Updated GitHub Actions dependencies, including actions-setup-cmake and cibuildwheel.
  #​6027

v3.0.3: Version 3.0.3

Compare Source

Bug fixes:

• Fixed TSS key exhaustion in implicitly_convertible() when many implicit conversions are registered across large module sets.
  #​6020

• Fixed heap-buffer-overflow in pythonbuf with undersized buffers by enforcing a minimum buffer size.
  #​6019

• Fixed virtual-inheritance pointer offset crashes when dispatching inherited methods through virtual bases.
  #​6017

• Fixed free(): invalid pointer crashes during interpreter shutdown with py::enum_<> by duplicating late-added def_property_static argument strings.
  #​6015

• Fixed function_record heap-type deallocation to call PyObject_Free() and decref the type.
  #​6010

• Hardened PYBIND11_MODULE_PYINIT and get_internals() against module-initialization crashes.
  #​6018

• Fixed static_pointer_cast build failure with virtual inheritance in holder_caster_foreign_helpers.h.
  #​6014

• Fixed ambiguous factory template specialization that caused compilation failures with nvcc + GCC 14.
  #​6011

• Fixed crash in def_readwrite for non-smart-holder properties of smart-holder classes.
  #​6008

• Fixed memory leak for py::dynamic_attr() objects on Python 3.13+ by clearing managed __dict__ contents during deallocation.
  #​5999

• Fixed binding of noexcept and ref-qualified (&, &&) methods inherited from unregistered base classes.
  #​5992

Internal:

• Moved tomlkit dependency to the dev dependency group.
  #​5990

• Switched to newer public CPython APIs (PyType_GetFlags and public vectorcall APIs where available).
  #​6005

Tests:

• Made an async callback test deterministic by replacing fixed sleep with bounded waiting.
  #​5986

CI:

• Re-enabled Android tests in the cibuildwheel workflow.
  #​6001

v3.0.2: Version 3.0.2

Compare Source

New Features:

• Added helper functions to py::array that return shape and strides as std::span when available.
  #​5974

Bug fixes:

• Added fallback locking for Python 3.13t where PyCriticalSection_BeginMutex is unavailable.
  #​5981

• Fixed race condition in py::make_key_iterator with free-threaded Python.
  #​5971

• MSVC 19.16 and earlier were blocked from using std::launder due to internal compiler errors.
  #​5968

• Internals destructors were updated to check the owning interpreter before clearing Python objects.
  #​5965

• Internals shutdown handling was refined in two iterations before release: an initial finalization-time cleanup was followed by a safety adjustment to avoid late-shutdown py::cast segfaults.
  #​5958
  #​5972

• Fixed ambiguous str(handle) construction for object-derived types like kwargs or dict by templatizing the constructor with SFINAE.
  #​5949

• Fixed concurrency consistency for internals_pp_manager under multiple-interpreters.
  #​5947

• Fixed MSVC LNK2001 in C++20 builds when /GL (whole program optimization) is enabled.
  #​5939

• Added per-interpreter storage for gil_safe_call_once_and_store to make it safe under multi-interpreters.
  #​5933

• A workaround for a GCC -Warray-bounds false positive in argument_vector was added.
  #​5908

• Corrected a mistake where support for __index__ was added, but the type hints did not reflect acceptance of SupportsIndex objects. Also fixed a long-standing bug: the complex-caster did not accept __index__ in convert mode.
  #​5891

• Fixed *args/**kwargs return types. Added type hinting to py::make_tuple.
  #​5881

• Fixed compiler error in type_caster_generic when casting a T implicitly convertible from T*.
  #​5873

• Updated py::native_enum bindings to unregister enum types on destruction, preventing a use-after-free when returning a destroyed enum instance.
  #​5871

• Fixed undefined behavior that occurred when importing pybind11 modules from non-main threads created by C API modules or embedded python interpreters.
  #​5870

• Fixed dangling pointer in internals::registered_types_cpp_fast.
  #​5867

• Added support for std::shared_ptr<T> when loading module-local or conduit types from other modules.
  #​5862

• Fixed thread-safety issues if types were concurrently registered while get_local_type_info() was called in free threaded Python.
  #​5856

• Fixed py::float_ casting and py::int_ and py::float_ type hints.
  #​5839

• Fixed two smart_holder bugs in shared_ptr and unique_ptr adoption with multiple/virtual inheritance:

  • shared_ptr to-Python caster was updated to register the correct subobject pointer (fixes #​5786).
  • unique_ptr adoption was updated to own the proper object start while aliasing subobject pointers for registration, which fixed MSVC crashes during destruction.
    #​5836

• Constrained accessor::operator= templates to avoid obscuring special members.
  #​5832

• Fixed crash that can occur when finalizers acquire and release the GIL.
  #​5828

• Fixed compiler detection in pybind11/detail/pybind11_namespace_macros.h for clang-cl on Windows, to address warning suppression macros.
  #​5816

• Fixed compatibility with CMake policy CMP0190 by not always requiring a Python interpreter when cross-compiling.
  #​5829

• Added a static assertion to disallow keep_alive and call_guard on properties.
  #​5533

Internal:

• CMake policy limit was set to 4.1.
  #​5944

• Improved performance of function calls between Python and C++ by switching to the "vectorcall" calling protocol.
  #​5948

• Many C-style casts were replaced with C++-style casts.
  #​5930

• Added cast_sources abstraction to type_caster_generic.
  #​5866

• Improved the performance of from-Python conversions of legacy pybind11 enum objects bound by py::enum_.
  #​5860

• Reduced size overhead by deduplicating functions' readable signatures and type information.
  #​5857

• Used new Python 3.14 C APIs when available.
  #​5854

• Improved performance of function dispatch and type casting by porting two-level type info lookup strategy from nanobind.
  #​5842

• Updated .gitignore to exclude __pycache__/ directories.
  #​5838

• Changed internals to use thread_local instead of thread_specific_storage for increased performance.
  #​5834

• Reduced function call overhead by using thread_local for loader_life_support when possible.
  #​5830

• Removed heap allocation for the C++ argument array when dispatching functions with 6 or fewer arguments.
  #​5824

Documentation:

• Fixed docstring for long double complex types to use numpy.clongdouble instead of the deprecated numpy.longcomplex (removed in NumPy 2.0).
  #​5952

• The "Supported compilers" and "Supported platforms" sections in the main README.rst were replaced with a new "Supported platforms & compilers" section that points to the CI test matrix as the living source of truth.
  #​5910

• Fixed documentation formatting.
  #​5903

• Updated upgrade notes for py::native_enum.
  #​5885

• Clarified in the docs to what extent bindings are global.
  #​5859

Tests:

• Fixed deadlock in a free-threading test by releasing the GIL while waiting on synchronization.
  #​5973

• Calls to env.deprecated_call() were replaced with direct calls to pytest.deprecated_call().
  #​5893

• Updated pytest configuration to use log_level instead of log_cli_level.
  #​5890

CI:

• Added CI tests for windows-11-arm with clang/MSVC (currently python 3.13), windows-11-arm with clang/mingw (currently python 3.12).
  #​5932

• These clang-tidy rules were added: readability-redundant-casting, readability-redundant-inline-specifier, readability-redundant-member-init
  #​5924

• Replaced deprecated macos-13 runners with macos-15-intel in CI.
  #​5916

• Restored runs-on: windows-latest in CI.
  #​5835

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