[WIP] bpo-39465: Mark _Py_Identifier.object as atomic by vstinner · Pull Request #20390 · python/cpython

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This PR is basically a test to check if C compilers used by CPython
support C11 _Atomic specifier.

@vstinner

Windows x64 job failed with MSC compiler error:

Include\cpython\object.h(51,5): error C2061: syntax error: identifier '_Atomic'

That's not a good start :-(

@vstinner

I moved to a different approach: PR #20766.

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