Background: #2999, #4105, #4283, #4284
In a nutshell:
* Only macOS actually needs `PYBIND11_EXPORT_EXCEPTION` (#4284).
* Evidently (#4283), under macOS `PYBIND11_EXPORT_EXCEPTION` does not run the risk of introducing ODR violations,
* but evidently (#4283) under Linux it does, in the presumably rare/unusual situation that `RTLD_GLOBAL` is used.
* Windows does no have the equivalent of `RTLD_GLOBAL`, therefore `PYBIND11_EXPORT_EXCEPTION` has no practical benefit, on the contrary, noisy warning suppression pragmas are needed, therefore it is best left empty.
* Add option to force the use of the PYPY GIL scoped acquire/release logic to support nested gil access, see https://github.com/pybind/pybind11/issues/1276 and https://github.com/pytorch/pytorch/issues/83101
* Apply suggestions from code review
* Update CMakeLists.txt
* docs: update upgrade guide
* Update docs/upgrade.rst
* All bells & whistles.
* Add Reminder to common.h, so that we will not forget to purge `!WITH_THREAD` branches when dropping Python 3.6
* New sentence instead of semicolon.
* Temporarily pull in snapshot of PR #4246
* Add `test_release_acquire`
* Add more unit tests for nested gil locking
* Add test_report_builtins_internals_keys
* Very minor enhancement: sort list only after filtering.
* Revert change in docs/upgrade.rst
* Add test_multi_acquire_release_cross_module, while also forcing unique PYBIND11_INTERNALS_VERSION for cross_module_gil_utils.cpp
* Hopefully fix apparently new ICC error.
```
2022-10-28T07:57:54.5187728Z -- The CXX compiler identification is Intel 2021.7.0.20220726
...
2022-10-28T07:58:53.6758994Z icpc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is deprecated and will be removed from product release in the second half of 2023. The Intel(R) oneAPI DPC++/C++ Compiler (ICX) is the recommended compiler moving forward. Please transition to use this compiler. Use '-diag-disable=10441' to disable this message.
2022-10-28T07:58:54.5801597Z In file included from /home/runner/work/pybind11/pybind11/include/pybind11/detail/../detail/type_caster_base.h(15),
2022-10-28T07:58:54.5803794Z from /home/runner/work/pybind11/pybind11/include/pybind11/detail/../cast.h(15),
2022-10-28T07:58:54.5805740Z from /home/runner/work/pybind11/pybind11/include/pybind11/detail/../attr.h(14),
2022-10-28T07:58:54.5809556Z from /home/runner/work/pybind11/pybind11/include/pybind11/detail/class.h(12),
2022-10-28T07:58:54.5812154Z from /home/runner/work/pybind11/pybind11/include/pybind11/pybind11.h(13),
2022-10-28T07:58:54.5948523Z from /home/runner/work/pybind11/pybind11/tests/cross_module_gil_utils.cpp(13):
2022-10-28T07:58:54.5949009Z /home/runner/work/pybind11/pybind11/include/pybind11/detail/../detail/internals.h(177): error #2282: unrecognized GCC pragma
2022-10-28T07:58:54.5949374Z PYBIND11_TLS_KEY_INIT(tstate)
2022-10-28T07:58:54.5949579Z ^
2022-10-28T07:58:54.5949695Z
```
* clang-tidy fixes
* Workaround for PYPY WIN exitcode None
* Revert "Temporarily pull in snapshot of PR #4246"
This reverts commit 23ac16e859150f27fda25ca865cabcb4444e0770.
* Another workaround for PYPY WIN exitcode None
* Clean up how the tests are run "run in process" Part 1: uniformity
* Clean up how the tests are run "run in process" Part 2: use `@pytest.mark.parametrize` and clean up the naming.
* Skip some tests `#if defined(THREAD_SANITIZER)` (tested with TSAN using the Google-internal toolchain).
* Run all tests again but ignore ThreadSanitizer exitcode 66 (this is less likely to mask unrelated ThreadSanitizer issues in the future).
* bug fix: missing common.h include before using `PYBIND11_SIMPLE_GIL_MANAGEMENT`
For the tests in the github CI this does not matter, because
`PYBIND11_SIMPLE_GIL_MANAGEMENT` is always defined from the command line,
but when monkey-patching common.h locally, it matters.
* if process.exitcode is None: assert t_delta > 9.9
* More sophisiticated `_run_in_process()` implementation, clearly reporting `DEADLOCK`, additionally exercised via added `intentional_deadlock()`
* Wrap m.intentional_deadlock in a Python function, for `ForkingPickler` compatibility.
```
> ForkingPickler(file, protocol).dump(obj)
E TypeError: cannot pickle 'PyCapsule' object
```
Observed with all Windows builds including mingw but not PyPy, and macos-latest with Python 3.9, 3.10, 3.11 but not 3.6.
* Add link to potential solution for WOULD-BE-NICE-TO-HAVE feature.
* Add `SKIP_IF_DEADLOCK = True` option, to not pollute the CI results with expected `DEADLOCK` failures while we figure out what to do about them.
* Add COPY-PASTE-THIS: gdb ... command (to be used for debugging the detected deadlock)
* style: pre-commit fixes
* Do better than automatic pre-commit fixes.
* Add `PYBIND11_SIMPLE_GIL_MANAGEMENT` to `pytest_report_header()` (so that we can easily know when harvesting deadlock information from the CI logs).
Co-authored-by: Arnim Balzer <arnim@seechange.ai>
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* (bugfix): Improve bytes to str decoding error handling
* regroup test
* Further broaden tests
* Add another decode error test
* Fix bug in tests
* Reviewer suggestions
* First draft of Eigen::Tensor support
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Fix build errors
* Weird allocator stuff?
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Remove unused + additional allocator junk
* Disable warning
* Use constexpr
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* clang tidy fixes
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Resolve comments
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Remove auto constexpr function
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Try again for older C++
* Oops forgot constexpr
* Move to new files as suggested
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Fix weird tests
* Fix nits
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Oops, forgot import
* Fix clang 3.6 bug
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* More comprehensive test suite
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Refactor allocators to make things more clear
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Switch to std::copy
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Switch to DSizes instead of array
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Address feedback
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Fix python + dummy c++ change to trigger build
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Alignment
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Add include guard
* Forgot inline
* Fix compiler warning
* Remove bad test
* Better type signatures
* Add guards to make compiler requirements more explicit
* style: pre-commit fixes
* Force rerun of tests due to flake
* style: pre-commit fixes
* Keep pragmas & all related comments together, add PLEASE KEEP IN SYNC
* Move headers out of detail
* style: pre-commit fixes
* Fix cmake
* Improve casting
* style: pre-commit fixes
* Add a ton more tests + refactor
* Improve names
* style: pre-commit fixes
* Update include/pybind11/eigen/tensor.h
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
* Fix tests
* style: pre-commit fixes
* Update
* Add a test to verify that strange numpy arrays work
* Fix dumb compiler warning
* Better tests
* Better tests
* Fix tests
* style: pre-commit fixes
* More test fixes
* style: pre-commit fixes
* A ton more test coverage
* Fix tests
* style: pre-commit fixes
* style: pre-commit fixes
* Add back constexpr
* Another test
* style: pre-commit fixes
* Improve tests
* Whoops
* Less magic numbers
* Update tests/test_eigen_tensor.py
Co-authored-by: Sergiu Deitsch <sergiud@users.noreply.github.com>
* Update tests/test_eigen_tensor.py
Co-authored-by: Sergiu Deitsch <sergiud@users.noreply.github.com>
* style: pre-commit fixes
* Fix tests
* style: pre-commit fixes
* Fix memory leak
* style: pre-commit fixes
* Fix order
* style: pre-commit fixes
* Add test to make sure unsafe casts fail
* Minor bug fix to work on 32 bit machines
* Implement convert flag
* style: pre-commit fixes
* Switch to correct TensorMap const use
* style: pre-commit fixes
* Support older versions of eigen
* Weird c++ compilers
* Fix Eigen bug
* Fix another eigen bug
* Yet another eigen bug
* Potential flakes?
* style: pre-commit fixes
* Rerun tests with dummy exception to find out what is going on
* Another dummy test run
* Ablate more
* Found the broken test?
* One step closer
* one step further
* Double check
* one thing at a time
* Give up and disable the test
* Clang lies about being gcc
* Oops, fix matrix test
* style: pre-commit fixes
* Add tests to verify scalar conversions
* style: pre-commit fixes
* Fix nits
* Support no_array
* Fix tests
* style: pre-commit fixes
* Silence compiler warning
* Improve build system for ancient compilers
* Make clang happy
* Make gcc happy
* Implement Skylion's suggestions
* Fix warning
* Inline const pointer check
* Implement suggestions
* style: pre-commit fixes
* Improve tests
* Typo
* style: pre-commit fixes
* Support Google's build environment
* style: pre-commit fixes
* Update include/pybind11/eigen/tensor.h
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
* style: pre-commit fixes
* Test cleanup per Skylion
* Switch to remvove_cv_t
* Cleaner test
* style: pre-commit fixes
* Remove tensor from eigen.h, update tests
* style: pre-commit fixes
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
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* bugfix: contains now throws an exception if the key is not hashable
* Fix tests and improve robustness
* Remove todo
* Workaround PyPy corner case
* PyPy xfail
* Fix typo
* fix xfail
* Make clang-tidy happy
* Remove redundant exc checking
Use `PyCapsule_Destructor` (part of the stable Python ABI) instead of spelling out the C `typedef`.
The deprecation message is misleading. Replace with a message pointing to another existing ctor.
Background: According to @wjakob the original motivation for deprecating the ctor (in PR #752) was to hide Python C API details, but PR #902 brought those back with a new ctor, it cannot be avoided. Having a `PyCapsule_Destructor` or a `void (*destructor)(void *)` are two separate and valid use cases.
* Reproducer for issue encountered in smart_holder update.
* clang-tidy compatibility (untested).
* Add `enable_if_t` to workaround.
* Bug fix: Move `PYBIND11_USING_WORKAROUND_FOR_CUDA_11_4_THROUGH_8` determination to detail/common.h
So that it actually is defined in pybind11.h
* Try using the workaround (which is nicer than the original code) universally.
* Reduce reproducer for CUDA 11.7 issue encountered in smart_holder update.
This commit tested in isolation on top of current master + first version of reproducer (62311eb431).
Succeeds with Debian Clang 14.0.6 C++17 (and probably all other compilers).
Fails for CUDA 11.7:
```
cd /build/tests && /usr/local/cuda/bin/nvcc -forward-unknown-to-host-compiler -Dpybind11_tests_EXPORTS -I/mounted_pybind11/include -isystem=/usr/include/python3.10 -g --generate-code=arch=compute_52,code=[compute_52,sm_52] -Xcompiler=-fPIC -Xcompiler=-fvisibility=hidden -Werror all-warnings -std=c++17 -MD -MT tests/CMakeFiles/pybind11_tests.dir/test_class.cpp.o -MF CMakeFiles/pybind11_tests.dir/test_class.cpp.o.d -x cu -c /mounted_pybind11/tests/test_class.cpp -o CMakeFiles/pybind11_tests.dir/test_class.cpp.o
/mounted_pybind11/tests/test_class.cpp(53): error: more than one instance of overloaded function "pybind11::class_<type_, options...>::def [with type_=test_class::pr4220_tripped_over_this::Empty0, options=<>]" matches the argument list:
function template "pybind11::class_<test_class::pr4220_tripped_over_this::Empty0> &pybind11::class_<type_, options...>::def(const char *, Func &&, const Extra &...) [with type_=test_class::pr4220_tripped_over_this::Empty0, options=<>]"
/mounted_pybind11/include/pybind11/pybind11.h(1557): here
function template "pybind11::class_<test_class::pr4220_tripped_over_this::Empty0> &pybind11::class_<type_, options...>::def(const T &, const Extra &...) [with type_=test_class::pr4220_tripped_over_this::Empty0, options=<>]"
/mounted_pybind11/include/pybind11/pybind11.h(1586): here
argument types are: (const char [8], <unknown-type>)
object type is: pybind11::class_<test_class::pr4220_tripped_over_this::Empty0>
1 error detected in the compilation of "/mounted_pybind11/tests/test_class.cpp".
```
* fix: PyCapsule_GetDestructor is allowed to return a nullptr destructor
Previously, this code would error out if the destructor happened to be
a nullptr. This is incorrect. nullptrs are allowed for capsule
destructors.
"It is legal for a capsule to have a NULL destructor. This makes a
NULL return code somewhat ambiguous; use PyCapsule_IsValid() or
PyErr_Occurred() to disambiguate."
See:
https://docs.python.org/3/c-api/capsule.html#c.PyCapsule_GetDestructor
I noticed this while working on a type caster related to #3858 DLPack
happens to allow the destructor not to be defined on a capsule, and I
encountered such a case. See:
e2bdd3bee8/include/dlpack/dlpack.h (L219)
* Add test for the fix.
* Update tests/test_pytypes.cpp
I tried this locally and it works!
I never knew that there are cases where `reinterpret_cast` does not work but `static_cast` does. Let's see if all compilers are happy with this.
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
* style: pre-commit fixes
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* Work-Around: NVCC 11.4.0 - 11.8.0
Adds a targeted NVCC work around for limited number of CUDA
releases. Fixed in NVCC development.
* style: pre-commit fixes
* CI: Bump CTK Version 11.2 -> 11.7
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* Call reserve method in set and map casters too
* Refactor template logic into has_reserve_method
* Adjust comment for reviews
* Rearrange reserve_maybe to not be underneath macro
* Add debug fprintf to test_interpreter.cpp
* Update `sys.path` from `PYTHONPATH` in Python >= 3.11 branch of `initialize_interpreter()`
* Use `config.isolated = 0; config.use_environment = 1;`
As suggsted by @vstinner here: https://github.com/pybind/pybind11/pull/4119#issuecomment-1219442853
* Add `TEST_CASE("PYTHONPATH is used to update sys.path")`
* Fix clang-tidy error.
* Use `_putenv_s()` under Windows.
* Fix clang-tidy error: argument name ... in comment does not match parameter name
* Remove slash from PYTHONPATH addition, to work around Windows slash-vs-backslash issue.
* Use `py::str(...)` instead of `.attr("__str__")` as suggested by @skylion007
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
* Add `-DPYBIND11_WERROR=ON` to mingw cmake commands (and `-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON`).
* Using no-destructor idiom to side-step overzealous MINGW warning.
* Add __MINGW32__ pragma GCC diagnostic ignored in eigen.h
* Add another no-destructor workaround.
* Temporarily add -k (keep-going) flags to hopefully speed up finding all warnings.
* Revert "Temporarily add -k (keep-going) flags to hopefully speed up finding all warnings."
This reverts commit f36b0af8f9.
* Very minor shuffle to avoid MSVC warnings.
* Remove all `:BOOL` as suggested by @henryiii
* Insert type_caster_odr_guard<> (an empty struct to start with).
* Add odr_guard_registry() used in type_caster_odr_guard() default constructor.
* Add minimal_real_caster (from PR #3862) to test_async, test_buffers
* VERY MESSY SNAPSHOT of WIP, this was the starting point for cl/454658864, which has more changes on top.
* Restore original test_async, test_buffers from current smart_holder HEAD
* Copy from cl/454991845 snapshot Jun 14, 5:08 PM
* Cleanup of tests. Systematically insert `if (make_caster<T>::translation_unit_local) {`
* Small simplification of odr_guard_impl()
* WIP
* Add PYBIND11_SOURCE_FILE_LINE macro.
* Replace PYBIND11_TYPE_CASTER_UNIQUE_IDENTIFIER with PYBIND11_TYPE_CASTER_SOURCE_FILE_LINE, baked into PYBIND11_TYPE_CASTER macro.
* Add more PYBIND11_DETAIL_TYPE_CASTER_ACCESS_TRANSLATION_UNIT_LOCAL; resolves "unused" warning when compiling test_custom_type_casters.cpp
* load_type fixes & follow-on cleanup
* Strip ./ from source_file_line
* Add new tests to CMakeLists.txt, disable PYBIND11_WERROR
* Replace C++17 syntax. Compiles with Debian clang 13 C++11 mode, but fails to link. Trying GitHub Actions anyway to see if there are any platforms that support https://en.cppreference.com/w/cpp/language/tu_local before C++20. Note that Debian clang 13 C++17 works locally.
* Show C++ version along with ODR VIOLATION DETECTED message.
* Add source_file_line_basename()
* Introduce PYBIND11_TYPE_CASTER_ODR_GUARD_ON (but not set automatically).
* Minor cleanup.
* Set PYBIND11_TYPE_CASTER_ODR_GUARD_ON automatically.
* Resolve clang-tidy error.
* Compatibility with old compilers.
* Fix off-by-one in source_file_line_basename()
* Report PYBIND11_INTERNALS_ID & C++ Version from pytest_configure()
* Restore use of PYBIND11_WERROR
* Move cpp_version_in_use() from cast.h to pybind11_tests.cpp
* define PYBIND11_DETAIL_ODR_GUARD_IMPL_THROW_DISABLED true in test_odr_guard_1,2.cpp
* IWYU cleanup of detail/type_caster_odr_guard.h
* Replace `throw err;` to resolve clang-tidy error.
* Add new header filename to CMakeLists.txt, test_files.py
* Experiment: Try any C++17 compiler.
* Fix ifdef for pragma GCC diagnostic.
* type_caster_odr_guard_impl() cleanup
* Move type_caster_odr_guard to type_caster_odr_guard.h
* Rename test_odr_guard* to test_type_caster_odr_guard*
* Remove comments that are (now) more distracting than helpful.
* Mark tu_local_no_data_always_false operator bool as explicit (clang-tidy). See also: https://stackoverflow.com/questions/39995573/when-can-i-use-explicit-operator-bool-without-a-cast
* New PYBIND11_TYPE_CASTER_ODR_GUARD_STRICT option (current on by default).
* Add test_type_caster_odr_registry_values(), test_type_caster_odr_violation_detected_counter()
* Report UNEXPECTED: test_type_caster_odr_guard_2.cpp prevailed (but do not fail).
* Apply clang-tidy suggestion.
* Attempt to handle valgrind behavior.
* Another attempt to handle valgrind behavior.
* Yet another attempt to handle valgrind behavior.
* Trying a new direction: show compiler info & std for UNEXPECTED: type_caster_odr_violation_detected_count() == 0
* compiler_info MSVC fix. num_violations == 0 condition.
* assert pybind11_tests.compiler_info is not None
* Introduce `make_caster_intrinsic<T>`, to be able to undo the 2 changes from `load_type` to `load_type<T>`. This is to avoid breaking 2 `pybind11::detail::load_type()` calls found in the wild (Google global testing).
One of the breakages in the wild was: 0f0f600767/python/tensorstore/subscript_method.h (L61)
* Add test for stl.h / stl_bind.h mix.
Manually verified that the ODR guard detects the ODR violation:
```
C++ Info: Debian Clang 13.0.1 C++17 __pybind11_internals_v4_clang_libstdcpp_cxxabi1002_sh_def__
=========================================================== test session starts ============================================================
platform linux -- Python 3.9.12, pytest-6.2.3, py-1.10.0, pluggy-0.13.1 -- /usr/bin/python3
...
================================================================= FAILURES =================================================================
_____________________________________________ test_type_caster_odr_violation_detected_counter ______________________________________________
def test_type_caster_odr_violation_detected_counter():
...
else:
> assert num_violations == 1
E assert 2 == 1
E +2
E -1
num_violations = 2
test_type_caster_odr_guard_1.py:51: AssertionError
========================================================= short test summary info ==========================================================
FAILED test_type_caster_odr_guard_1.py::test_type_caster_odr_violation_detected_counter - assert 2 == 1
======================================================= 1 failed, 5 passed in 0.08s ========================================================
```
* Eliminate need for `PYBIND11_DETAIL_TYPE_CASTER_ACCESS_TRANSLATION_UNIT_LOCAL` macro.
Copying code first developed by @amauryfa. I tried this at an earlier stage, but by itself this was insufficient. In the meantime I added in the TU-local mechanisms: trying again.
Passes local testing:
```
DISABLED std::system_error: ODR VIOLATION DETECTED: pybind11::detail::type_caster<mrc_ns::type_mrc>: SourceLocation1="/usr/local/google/home/rwgk/forked/pybind11/tests/test_type_caster_odr_guard_1.cpp:18", SourceLocation2="/usr/local/google/home/rwgk/forked/pybind11/tests/test_type_caster_odr_guard_2.cpp:19"
C++ Info: Debian Clang 13.0.1 C++17 __pybind11_internals_v4_clang_libstdcpp_cxxabi1002_sh_def__
=========================================================== test session starts ============================================================
platform linux -- Python 3.9.12, pytest-6.2.3, py-1.10.0, pluggy-0.13.1 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /usr/local/google/home/rwgk/forked/pybind11/tests, configfile: pytest.ini
collected 6 items
test_type_caster_odr_guard_1.py::test_type_mrc_to_python PASSED
test_type_caster_odr_guard_1.py::test_type_mrc_from_python PASSED
test_type_caster_odr_guard_1.py::test_type_caster_odr_registry_values PASSED
test_type_caster_odr_guard_1.py::test_type_caster_odr_violation_detected_counter PASSED
test_type_caster_odr_guard_2.py::test_type_mrc_to_python PASSED
test_type_caster_odr_guard_2.py::test_type_mrc_from_python PASSED
============================================================ 6 passed in 0.01s =============================================================
```
* tu_local_descr with src_loc experiment
* clang-tidy suggested fixes
* Use source_file_line_from_sloc in type_caster_odr_guard_registry
* Disable type_caster ODR guard for __INTEL_COMPILER (see comment). Also turn off printf.
* Add missing include (discovered via google-internal testing).
* Work `scr_loc` into `descr`
* Use `TypeCasterType::name.sloc` instead of `source_file_line.sloc`
Manual re-verification:
```
+++ b/tests/test_type_caster_odr_guard_2.cpp
- // m.def("pass_vector_type_mrc", mrc_ns::pass_vector_type_mrc);
+ m.def("pass_vector_type_mrc", mrc_ns::pass_vector_type_mrc);
```
```
> assert num_violations == 1
E assert 2 == 1
num_violations = 2
test_type_caster_odr_guard_1.py:51: AssertionError
```
* Fix small oversight (src_loc::here() -> src_loc{nullptr, 0}).
* Remove PYBIND11_DETAIL_TYPE_CASTER_ACCESS_TRANSLATION_UNIT_LOCAL macro completely.
* Remove PYBIND11_TYPE_CASTER_SOURCE_FILE_LINE macro completely. Some small extra cleanup.
* Minor tweaks looking at the PR with a fresh eye.
* src_loc comments
* Add new test_descr_src_loc & and fix descr.h `concat()` `src_loc` bug discovered while working on the test.
* Some more work on source code comments.
* Fully document the ODR violations in the ODR guard itself and introduce `PYBIND11_TYPE_CASTER_ODR_GUARD_ON_IF_AVAILABLE`
* Update comment (incl. mention of deadsnakes known to not work as intended).
* Use no-destructor idiom for type_caster_odr_guard_registry, as suggested by @laramiel
* Fix clang-tidy error: 'auto reg' can be declared as 'auto *reg' [readability-qualified-auto,-warnings-as-errors]
* WIP
* Revert "WIP" (tu_local_no_data_always_false_base experiment).
This reverts commit 31e8ac562f.
* Change `PYBIND11_TYPE_CASTER_ODR_GUARD_ON` to `PYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD`, based on a suggestion by @rainwoodman
* Improved `#if` determining `PYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD`, based on suggestion by @laramiel
* Make `descr::sloc` `const`, as suggested by @rainwoodman
* Rename macro to `PYBIND11_DETAIL_TYPE_CASTER_ODR_GUARD_IMPL_DEBUG`, as suggested by @laramiel
* Tweak comments some more (add "white hat hacker" analogy).
* Bring back `PYBIND11_CPP17` in determining `PYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD`, to hopefully resolve most if not all of the many CI failures (89 failing, 32 successful: https://github.com/pybind/pybind11/runs/7430295771).
* Try another workaround for `__has_builtin`-related breakages (https://github.com/pybind/pybind11/runs/7430720321).
* Remove `defined(__has_builtin)` and subconditions.
* Update "known to not work" expectation in test and comment.
* `pytest.skip` `num_violations == 0` only `#ifdef __NO_INLINE__` (irrespective of the compiler)
* Systematically change all new `#ifdef` to `#if defined` (review suggestion).
* Bring back MSVC comment that got lost while experimenting.
* For PyPy only, re-enable old behavior (likely to mask bugs), to avoid segfault with unknown root cause.
Change prompted by https://github.com/pybind/pybind11/issues/4075
* Undo the change in tests/test_exceptions.py
I turns out (I forgot) that PyPy segfaults in `test_flaky_exception_failure_point_init` already before the `MISMATCH` code path is reached:
https://github.com/pybind/pybind11/runs/7383663596
```
RPython traceback:
test_exceptions.py .......X.........Error in cpyext, CPython compatibility layer:
File "pypy_module_cpyext.c", line 14052, in wrapper_second_level__star_3_1
File "pypy_module_cpyext_1.c", line 35750, in not_supposed_to_fail
Fatal Python error: Segmentation fault
Stack (most recent call first, approximate line numbers):
File "/home/runner/work/pybind11/pybind11/tests/test_exceptions.py", line 306 in test_flaky_exception_failure_point_init
The function PyErr_NormalizeException was not supposed to fail
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/python.py", line 185 in pytest_pyfunc_call
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_callers.py", line 9 in _multicall
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_manager.py", line 77 in _hookexec
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_hooks.py", line 244 in __call__
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/python.py", line 1716 in runtest
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 159 in pytest_runtest_call
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_callers.py", line 9 in _multicall
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_manager.py", line 77 in _hookexec
Fatal error in cpyext, CPython compatibility layer, calling PyErr_NormalizeException
Either report a bug or consider not using this particular extension
<SystemError object at 0x7fcc8cea6868>
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_hooks.py", line 244 in __call__
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 261 in <lambda>
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 317 in from_call
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 246 in call_runtest_hook
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 218 in call_and_report
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 118 in runtestprotocol
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/runner.py", line 110 in pytest_runtest_protocol
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_callers.py", line 9 in _multicall
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_manager.py", line 77 in _hookexec
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_hooks.py", line 244 in __call__
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/main.py", line 335 in pytest_runtestloop
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_callers.py", line 9 in _multicall
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_manager.py", line 77 in _hookexec
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_hooks.py", line 244 in __call__
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/main.py", line 318 in _main
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/main.py", line 255 in wrap_session
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/main.py", line 314 in pytest_cmdline_main
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_callers.py", line 9 in _multicall
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_manager.py", line 77 in _hookexec
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pluggy/_hooks.py", line 244 in __call__
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/config/__init__.py", line 133 in main
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/_pytest/config/__init__.py", line 181 in console_main
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/site-packages/pytest/__main__.py", line 1 in <module>
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/lib-python/3/runpy.py", line 62 in _run_code
File "/opt/hostedtoolcache/PyPy/3.7.13/x64/lib-python/3/runpy.py", line 170 in _run_module_as_main
File "<builtin>/app_main.py", line 109 in run_toplevel
File "<builtin>/app_main.py", line 652 in run_command_line
File "<builtin>/app_main.py", line 996 in entry_point
Segmentation fault (core dumped)
```
* Add test_pypy_oserror_normalization
* Disable new `PYPY_VERSION` `#if`, to verify that the new test actually fails.
* Restore PYPY_VERSION workaround and update comment to reflect what was learned.
* [ci skip] Fix trivial oversight in comment.
* Use equals default in pyobject macros
* Remove extra semicolon
* Update clang-tidy equals-default rule to not ignore macros
* Fix formatting
* One last formatting change
