unicodeobject.c doesn't compile when defined EXPERIMENTAL_ISOLATED_SUBINTERPRETERS, variable "interned" not found

[moytrage]

BPO	46832
Nosy	@vstinner, @ericsnowcurrently, @kumaraditya303
Files	unicodeobject.c

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-02-23.06:12:09.073>
labels = ['expert-subinterpreters', 'build', '3.10']
title = 'unicodeobject.c doesn\'t compile when defined EXPERIMENTAL_ISOLATED_SUBINTERPRETERS, variable "interned" not found'
updated_at = <Date 2022-03-03.11:29:31.887>
user = 'https://bugs.python.org/moytrage'

bugs.python.org fields:

activity = <Date 2022-03-03.11:29:31.887>
actor = 'kumaraditya'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Subinterpreters']
creation = <Date 2022-02-23.06:12:09.073>
creator = 'moytrage'
dependencies = []
files = ['50637']
hgrepos = []
issue_num = 46832
keywords = []
message_count = 3.0
messages = ['413774', '414429', '414431']
nosy_count = 4.0
nosy_names = ['vstinner', 'eric.snow', 'kumaraditya', 'moytrage']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue46832'
versions = ['Python 3.10']

[moytrage]

1. Downloaded https://www.python.org/ftp/python/3.10.2/Python-3.10.2.tar.xz

2. Compiled under MSVC 2019 with define EXPERIMENTAL_ISOLATED_SUBINTERPRETERS

3. Got compilation error of file Objects/unicodeobject.c at line 15931, about undefined variable "interned", it is function _PyUnicode_ClearInterned(), uncompilable code is "if (interned == NULL) {".

This happens because when EXPERIMENTAL_ISOLATED_SUBINTERPRETERS is defined then INTERNED_STRINGS is undefined hence global variable "static PyObject *interned = NULL;" is not created, and _PyUnicode_ClearInterned() uses this global variable "interned".

For reference attaching my version of "unicodeobject.c" which has compilation error at line 15931.

[vstinner]

This build flag is experimental and unsupported. If you care, you should target Python 3.11 which is currently under development.