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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"In C++, Python 3.11 C API introduces new compiler warnings/errors","articleBody":"To fix C++ compiler warnings about \"old-style casts\", I recently modified the Python C API to use C++ ``reinterpret_cast\u003c\u003e`` and ``static_cast\u003c\u003e``: https://github.com/python/cpython/pull/91959\r\n\r\nPreviously, \"old-style cast\" like ``(PyObject*)expr`` didn't emit a compiler warning if ``expr`` was ``const``. Now with the new cast, C++ compilers emit warnings: see https://github.com/python/cpython/pull/91959#issuecomment-1113674438\r\n\r\n``const_cast\u003c\u003e`` can be used to fix this issue.\r\n\r\nNote: [PEP 670](https://peps.python.org/pep-0670/) was accepted with the condition: converting macros to functions must not introduce new compiler warnings (so no new compile errors neither). But most functions modified in Python 3.11 (to use C++ casts) were already static inline functions in Python 3.10.","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2022-05-02T09:21:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/92135/cpython/issues/92135"}