Fixes https://github.com/protocolbuffers/protobuf/issues/28261 by setting symbol visibility in `setup.py`, similar to `py_extension.bzl`, using the existing branching logic to bypass the flag on MSVC.
This issue manifests in the [NixOS/nixpkgs](https://github.com/NixOS/nixpkgs) build of the `protobuf` python package, which contains upb symbols, and causes fatal failures when loaded in a process that separately links/loads libprotobuf. We'll supply a patch there as well, until this can be backported or released in future protobuf versions.
Closes#28264
COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/28264 from mitchallain:mallain/fix-python-upb-symbols 6e118a62bf
PiperOrigin-RevId: 942223178
The Python source wheel is pulling in `decode_fast.c`, leading to compilation errors when it is not enabled.
While we could try to prevent this file from being in the source wheel at all, that is probably a short-term solution. If fasttable support is ever ready for prime time, we will need to be able to decide at build time whether to enable it or not, because it's not supported on all platforms.
#test-continuous
PiperOrigin-RevId: 752479765
There's a test run in test_python.yml that is non-trivial to get working with
Python 3.12 due to some refactoring of our Docker images that would be needed.
But this change updates everything else to add coverage for Python 3.12.
The main changes necessary to get the builds working were to upgrade some Pip
packages via requirements.txt, including in a patch to `rules_fuzzing` that I
plan to upstream soon. I also had to take an explicit dependency on
`setuptools`.
I removed tox.ini, since it was outdated and we have not been actively
maintaining it.
PiperOrigin-RevId: 580548224
Python 3.12 has removed the `distutils` module, so we need to stop relying on
it. Most of the parts we were using had a straightforward replacement in
`setuptools` or elsewhere in the Python standard library. I couldn't find a
good replacement for `distutils.command.clean`, though. We were only using it
to enable `python setup.py clean`, so I just removed that functionality since
directly invoking setup.py is deprecated anyway.
While I was looking at this I realized that our python/release.sh script is
unused, so I also removed that.
PiperOrigin-RevId: 571035275
This change moves almost everything in the `upb/` directory up one level, so
that for example `upb/upb/generated_code_support.h` becomes just
`upb/generated_code_support.h`. The only exceptions I made to this were that I
left `upb/cmake` and `upb/BUILD` where they are, mostly because that avoids
conflict with other files and the current locations seem reasonable for now.
The `python/` directory is a little bit of a challenge because we had to merge
the existing directory there with `upb/python/`. I made `upb/python/BUILD` into
the BUILD file for the merged directory, and it effectively loads the contents
of the other BUILD file via `python/build_targets.bzl`, but I plan to clean
this up soon.
PiperOrigin-RevId: 568651768
