[issue39571] clang warns "warning: redefinition of typedef 'PyTypeObject' is a C11 feature [-Wtypedef-redefinition]"

[Sam Gross]

New submission from Sam Gross <colesbury at gmail.com>:

A recent commit added a typedef for PyTypeObject in Include/object.h

https://github.com/python/cpython/commit/0e4e735d06967145b49fd00693627f3624991dbc

This duplicates the typedef in Include/cpython/object.h. Building with clang now issues a warning:

./Include/cpython/object.h:274:3: warning: redefinition of typedef 'PyTypeObject' is a C11 feature [-Wtypedef-redefinition]

This is due to the combination of `-Wall` and `-std=c99`. GCC will only warn if the `-pedantic` option is specified.

----------
components: C API
messages: 361497
nosy: colesbury, vstinner
priority: normal
severity: normal
status: open
title: clang warns "warning: redefinition of typedef 'PyTypeObject' is a C11 feature [-Wtypedef-redefinition]"
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39571>
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