gh-93103: Deprecate global configuration variable (#93104)

Deprecate global configuration variables, like
Py_IgnoreEnvironmentFlag, in the documentation: the
Py_InitializeFromConfig() API should be instead.

Doc/c-api/init.rst

@@ -83,74 +83,133 @@ to 1 and ``-bb`` sets :c:data:`Py_BytesWarningFlag` to 2.
 
 .. c:var:: int Py_BytesWarningFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.bytes_warning` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    Issue a warning when comparing :class:`bytes` or :class:`bytearray` with
    :class:`str` or :class:`bytes` with :class:`int`.  Issue an error if greater
    or equal to ``2``.
 
    Set by the :option:`-b` option.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_DebugFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.parser_debug` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    Turn on parser debugging output (for expert only, depending on compilation
    options).
 
    Set by the :option:`-d` option and the :envvar:`PYTHONDEBUG` environment
    variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_DontWriteBytecodeFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.write_bytecode` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    If set to non-zero, Python won't try to write ``.pyc`` files on the
    import of source modules.
 
    Set by the :option:`-B` option and the :envvar:`PYTHONDONTWRITEBYTECODE`
    environment variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_FrozenFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.pathconfig_warnings` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Suppress error messages when calculating the module search path in
    :c:func:`Py_GetPath`.
 
    Private flag used by ``_freeze_module`` and ``frozenmain`` programs.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_HashRandomizationFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.hash_seed` and :c:member:`PyConfig.use_hash_seed` should
+   be used instead, see :ref:`Python Initialization Configuration
+   <init-config>`.
+
    Set to ``1`` if the :envvar:`PYTHONHASHSEED` environment variable is set to
    a non-empty string.
 
    If the flag is non-zero, read the :envvar:`PYTHONHASHSEED` environment
    variable to initialize the secret hash seed.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_IgnoreEnvironmentFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.use_environment` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Ignore all :envvar:`PYTHON*` environment variables, e.g.
    :envvar:`PYTHONPATH` and :envvar:`PYTHONHOME`, that might be set.
 
    Set by the :option:`-E` and :option:`-I` options.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_InspectFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.inspect` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    When a script is passed as first argument or the :option:`-c` option is used,
    enter interactive mode after executing the script or the command, even when
    :data:`sys.stdin` does not appear to be a terminal.
 
    Set by the :option:`-i` option and the :envvar:`PYTHONINSPECT` environment
    variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_InteractiveFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.interactive` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Set by the :option:`-i` option.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_IsolatedFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.isolated` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Run Python in isolated mode. In isolated mode :data:`sys.path` contains
    neither the script's directory nor the user's site-packages directory.
 
    Set by the :option:`-I` option.
 
    .. versionadded:: 3.4
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_LegacyWindowsFSEncodingFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyPreConfig.legacy_windows_fs_encoding` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    If the flag is non-zero, use the ``mbcs`` encoding with ``replace`` error
    handler, instead of the UTF-8 encoding with ``surrogatepass`` error handler,
    for the :term:`filesystem encoding and error handler`.
@@ -162,8 +221,14 @@ to 1 and ``-bb`` sets :c:data:`Py_BytesWarningFlag` to 2.
 
    .. availability:: Windows.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_LegacyWindowsStdioFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.legacy_windows_stdio` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    If the flag is non-zero, use :class:`io.FileIO` instead of
    :class:`WindowsConsoleIO` for :mod:`sys` standard streams.
 
@@ -174,45 +239,81 @@ to 1 and ``-bb`` sets :c:data:`Py_BytesWarningFlag` to 2.
 
    .. availability:: Windows.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_NoSiteFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.site_import` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Disable the import of the module :mod:`site` and the site-dependent
    manipulations of :data:`sys.path` that it entails.  Also disable these
    manipulations if :mod:`site` is explicitly imported later (call
    :func:`site.main` if you want them to be triggered).
 
    Set by the :option:`-S` option.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_NoUserSiteDirectory
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.user_site_directory` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Don't add the :data:`user site-packages directory <site.USER_SITE>` to
    :data:`sys.path`.
 
    Set by the :option:`-s` and :option:`-I` options, and the
    :envvar:`PYTHONNOUSERSITE` environment variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_OptimizeFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.optimization_level` should be used instead, see
+   :ref:`Python Initialization Configuration <init-config>`.
+
    Set by the :option:`-O` option and the :envvar:`PYTHONOPTIMIZE` environment
    variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_QuietFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.quiet` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    Don't display the copyright and version messages even in interactive mode.
 
    Set by the :option:`-q` option.
 
    .. versionadded:: 3.2
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_UnbufferedStdioFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.buffered_stdio` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    Force the stdout and stderr streams to be unbuffered.
 
    Set by the :option:`-u` option and the :envvar:`PYTHONUNBUFFERED`
    environment variable.
 
+   .. deprecated:: 3.12
+
 .. c:var:: int Py_VerboseFlag
 
+   This API is kept for backward compatibility: setting
+   :c:member:`PyConfig.verbose` should be used instead, see :ref:`Python
+   Initialization Configuration <init-config>`.
+
    Print a message each time a module is initialized, showing the place
    (filename or built-in module) from which it is loaded.  If greater or equal
    to ``2``, print a message for each file that is checked for when
@@ -221,6 +322,8 @@ to 1 and ``-bb`` sets :c:data:`Py_BytesWarningFlag` to 2.
    Set by the :option:`-v` option and the :envvar:`PYTHONVERBOSE` environment
    variable.
 
+   .. deprecated:: 3.12
+
 
 Initializing and finalizing the interpreter
 ===========================================
@@ -253,6 +356,9 @@ Initializing and finalizing the interpreter
    (without calling :c:func:`Py_FinalizeEx` first).  There is no return value; it is a
    fatal error if the initialization fails.
 
+   Use the :c:func:`Py_InitializeFromConfig` function to customize the
+   :ref:`Python Initialization Configuration <init-config>`.
+
    .. note::
       On Windows, changes the console mode from ``O_TEXT`` to ``O_BINARY``, which will
       also affect non-Python uses of the console using the C Runtime.
@@ -264,6 +370,9 @@ Initializing and finalizing the interpreter
    *initsigs* is ``0``, it skips initialization registration of signal handlers, which
    might be useful when Python is embedded.
 
+   Use the :c:func:`Py_InitializeFromConfig` function to customize the
+   :ref:`Python Initialization Configuration <init-config>`.
+
 
 .. c:function:: int Py_IsInitialized()
 

Doc/c-api/init_config.rst

@@ -835,8 +835,10 @@ PyConfig
 
       * Set :c:member:`~PyConfig.safe_path` to ``1``:
         don't prepend a potentially unsafe path to :data:`sys.path` at Python
-        startup.
-      * Set :c:member:`~PyConfig.use_environment` to ``0``.
+        startup, such as the current directory, the script's directory or an
+        empty string.
+      * Set :c:member:`~PyConfig.use_environment` to ``0``: ignore ``PYTHON``
+        environment variables.
       * Set :c:member:`~PyConfig.user_site_directory` to ``0``: don't add the user
         site directory to :data:`sys.path`.
       * Python REPL doesn't import :mod:`readline` nor enable default readline
@@ -846,7 +848,8 @@ PyConfig
 
       Default: ``0`` in Python mode, ``1`` in isolated mode.
 
-      See also :c:member:`PyPreConfig.isolated`.
+      See also the :ref:`Isolated Configuration <init-isolated-conf>` and
+      :c:member:`PyPreConfig.isolated`.
 
    .. c:member:: int legacy_windows_stdio
 
@@ -1177,13 +1180,13 @@ PyConfig
       imported, showing the place (filename or built-in module) from which
       it is loaded.
 
-      If greater or equal to ``2``, print a message for each file that is checked
-      for when searching for a module. Also provides information on module
-      cleanup at exit.
+      If greater than or equal to ``2``, print a message for each file that is
+      checked for when searching for a module. Also provides information on
+      module cleanup at exit.
 
       Incremented by the :option:`-v` command line option.
 
-      Set to the :envvar:`PYTHONVERBOSE` environment variable value.
+      Set by the :envvar:`PYTHONVERBOSE` environment variable value.
 
       Default: ``0``.
 

Misc/NEWS.d/next/C API/2022-05-23-13-33-18.gh-issue-93103.ooD3Eb.rst

@@ -0,0 +1,4 @@
+Deprecate global configuration variables, like
+:c:var:`Py_IgnoreEnvironmentFlag`, in the documentation: the
+:c:func:`Py_InitializeFromConfig` API should be instead. Patch by Victor
+Stinner.