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fix: set __file__ on submodules (#5584)

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* fix: set __file__ on submodules

The docs state ['The caller is responsible for setting a `__file__` attribute'](https://docs.python.org/3/c-api/module.html), but we
were not doing that, which interferes with pickling objects in submodules using cloudpickle. Users previously had to set the `__file__` attributes manually,
such as in 1fbbe1632e/src/boost_histogram/histogram.py (L83-L90).

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: support GraalPy

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: workaround only for GraalPython

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Add GRAALPY_VERSION_NUM to GraalPy workaround

* Fix "GRAALPY_VERSION_NUM not defined" issue

```
/Users/runner/work/pybind11/pybind11/include/pybind11/pybind11.h:1340:32: error: 'GRAALPY_VERSION_NUM' is not defined, evaluates to 0 [-Werror,-Wundef]
                               ^
```

Related ChatGPT conversation: https://chatgpt.com/share/67e6cb99-84b0-8008-99d6-aadc70242cf3

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rgrossekunst@nvidia.com>
This commit is contained in:
Henry Schreiner
2025-03-28 12:57:39 -04:00
committed by GitHub
parent c1cd022f16
commit 8f00d1eea0
2 changed files with 14 additions and 0 deletions
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tests/test_modules.py
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@@ -21,6 +21,7 @@ def test_nested_modules():
)
assert m.__name__ == "pybind11_tests.modules"
assert ms.__name__ == "pybind11_tests.modules.subsubmodule"
assert m.__file__ == ms.__file__
assert ms.submodule_func() == "submodule_func()"