[Bug 1900494] New: blender fails to build with Python 3.10: error: implicit declaration of function '_PyUnicode_AsStringAndSize'

https://bugzilla.redhat.com/show_bug.cgi?id=1900494

Bug ID: 1900494
           Summary: blender fails to build with Python 3.10: error:
                    implicit declaration of function
                    '_PyUnicode_AsStringAndSize'
           Product: Fedora
           Version: rawhide
            Status: NEW
         Component: blender
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail]
            Blocks: 1890881 (PYTHON3.10)
  Target Milestone: ---
    Classification: Fedora

blender fails to build with Python 3.10.0a2.

/python/intern/bpy.c:269:15: error: implicit declaration of function
'_PyUnicode_AsStringAndSize'; did you mean 'PyUnicode_FromStringAndSize'?
[-Werror=implicit-function-declaration]
  269 |   value_str = _PyUnicode_AsStringAndSize(value, &value_str_len);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |               PyUnicode_FromStringAndSize
/builddir/build/BUILD/blender-2.90.1/source/blender/python/intern/bpy.c:269:13:
warning: assignment to 'const char *' from 'int' makes pointer from integer
without a cast [-Wint-conversion]
  269 |   value_str = _PyUnicode_AsStringAndSize(value, &value_str_len);
      |             ^
cc1: some warnings being treated as errors

bpo-36346: Raises DeprecationWarning for PyUnicode_FromUnicode(NULL, size) and
PyUnicode_FromStringAndSize(NULL, size) with size > 0.

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-ra...

For all our attempts to build blender with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/blender/

Testing and mass rebuild of packages is happening in copr. You can follow these
instructions to test locally in mock if your package builds with Python 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're
building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive
[Build]Requires), so if this package is required a lot, it's important for us
to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you
don't want to work on this now, let us know so we can try to work around it on
our side.

Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1890881
[Bug 1890881] Python 3.10 tracker

[Bug 1900494] blender fails to build with Python 3.10: error: implicit declaration of function '_PyUnicode_AsStringAndSize'

https://bugzilla.redhat.com/show_bug.cgi?id=1900494

Mamoru TASAKA  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #1 from Mamoru TASAKA  ---
Relevant change:
https://github.com/python/cpython/commit/3a8fdb28794b2f19f6c8464378fb8b46bce...

Probably _PyUnicode_AsStringAndSize should just be changed to
PyUnicode_AsUTF8AndSize .

[Bug 1900494] blender fails to build with Python 3.10: error: implicit declaration of function '_PyUnicode_AsStringAndSize'

https://bugzilla.redhat.com/show_bug.cgi?id=1900494

--- Comment #3 from Mamoru TASAKA  ---
Once reported: https://developer.blender.org/T85573

[Bug 1900494] blender fails to build with Python 3.10: error: implicit declaration of function '_PyUnicode_AsStringAndSize'

https://bugzilla.redhat.com/show_bug.cgi?id=1900494

--- Comment #4 from Miro Hrončok  ---
This is a mass-posted update. Sorry if it is not 100% accurate to this
bugzilla.

The Python 3.10 rebuild is in progress in a Koji side tag. If you manage to fix
the problem, please commit the fix in the rawhide branch, but don't build the
package in regular rawhide.

You can either build the package in the side tag, with:

$ fedpkg build --target=f35-python

Or you can the build and we will eventually build it for you.

Note that the rebuild is still in progress, so not all (build) dependencies of
this package might be available right away.

Thanks.

See also https://fedoraproject.org/wiki/Changes/Python3.10

If you have general questions about the rebuild, please use this mailing list
thread:
https://lists.fedoraproject.org/archives/list/[e-mail]/...

[Bug 1900494] blender fails to build with Python 3.10: error: implicit declaration of function '_PyUnicode_AsStringAndSize'

https://bugzilla.redhat.com/show_bug.cgi?id=1900494

Fedora Update System  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |ERRATA
             Status|NEW                         |CLOSED
   Fixed In Version|                            |blender-2.93.3-7.fc36
        Last Closed|                            |2021-08-24 22:25:41

--- Comment #7 from Fedora Update System  ---
FEDORA-2021-aef49a8d94 has been pushed to the Fedora 36 stable repository.
If problem still persists, please make note of it in this bug report.