[Bug python/28668] New: Py_SetProgramName will be deprecated in Python 3.11

["kevinb at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28668

            Bug ID: 28668
           Summary: Py_SetProgramName will be deprecated in Python 3.11
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: kevinb at redhat dot com
  Target Milestone: ---

Py_SetProgramName, which is called from gdb/python/python.c, will be deprecated
in Python 3.11.  When that happens, we can expect to error messages like this
when building GDB with -Werror:

../../gdb/python/python.c:1757:21: error: 'void Py_SetProgramName(const
wchar_t*)' is deprecated [-Werror=deprecated-declarations]
 1757 |   Py_SetProgramName (progname_copy);
      |   ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
In file included from /usr/include/python3.11/Python.h:92,
                 from ../../gdb/python/python-internal.h:86,
                 from ../../gdb/python/python.c:92:
/usr/include/python3.11/pylifecycle.h:37:38: note: declared here
   37 | Py_DEPRECATED(3.11) PyAPI_FUNC(void) Py_SetProgramName(const wchar_t
*);
      |                                      ^~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors

In order to work around this problem, -Wno-deprecated-declarations may be
appended to the set of warning flags used to build GDB.

However, long term, we'll need to adjust do_start_initialization() in python.c
to use the PyConfig mechanisms introduced in Python 3.8.

For reference, see:

https://bugs.python.org/issue44113
https://docs.python.org/3.11/whatsnew/3.11.html
https://docs.python.org/3.11/c-api/init_config.html#c.PyConfig

The latter link contains an example which shows how to call
PyConfig_SetString() to set the program_name field in the PyConfig struct.

Sadly, we'll still need to support the use of Py_SetProgramName in
gdb/python/python.c because (I anticipate that) the GDB community will want to
support building against Python versions older than 3.8 for a while yet.

I recommend use of '#if Py_VERSION_HEX < 0x308000' to separate the new PyConfig
calls from the existing calls to Py_SetProgramName.

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