[issue36900] Use _PyCoreConfig rather than global configuration variables

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

With PR 13299, most global variable configurables are not directly accessed, outside code to initialize _PyPreConfig and _PyCoreConfig.

parser.c: Py_DebugFlag
fileutils.c: Py_UTF8Mode, Py_LegacyWindowsFSEncodingFlag
frozenmain.c: Py_VerboseFlag
Py_FdIsInteractive(): Py_InteractiveFlag
PySys_SetArgv(): Py_IsolatedFlag()
Py_GETENV(): Py_IsolatedFlag

The problem is that these files, functions and macros may be used before Python is initialized: before Python has an interpreter.

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<https://bugs.python.org/issue36900>
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