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From: "kevinb at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug python/28668] New: Py_SetProgramName will be deprecated in
Python 3.11
Date: Tue, 07 Dec 2021 16:08:16 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28668
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 deprec=
ated
in Python 3.11. When that happens, we can expect to error messages like th=
is
when building GDB with -Werror:
../../gdb/python/python.c:1757:21: error: 'void Py_SetProgramName(const
wchar_t*)' is deprecated [-Werror=3Ddeprecated-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 pytho=
n.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 PyCo=
nfig
calls from the existing calls to Py_SetProgramName.
--=20
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