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gh-92135: Fix _Py_reinterpret_cast() for const (#92138)

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Fix C++ compiler warnings on cast macros, like _PyObject_CAST(), when
casting a constant expression to a non constant type: use
const_cast<> in C++.

* In C++, Py_SAFE_DOWNCAST() now uses static_cast<> rather than
  reinterpret_cast<>.
* Add tests to the _testcppext C++ extension.
* test_cppext no longer captures stdout in verbose mode.
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Victor Stinner 2022-05-02 17:07:00 +02:00 • committed by GitHub
parent b11243e85e
commit 031397063e
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5 changed files with 62 additions and 14 deletions
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3
Include/methodobject.h
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@ -43,8 +43,7 @@ typedef PyObject *(*PyCMethod)(PyObject *, PyTypeObject *, PyObject *const *,
// it triggers an undefined behavior when Python calls it with 2 parameters
// (bpo-33012).
#define _PyCFunction_CAST(func) \
_Py_reinterpret_cast(PyCFunction, \
_Py_reinterpret_cast(void(*)(void), (func)))
_Py_reinterpret_cast(PyCFunction, _Py_reinterpret_cast(void(*)(void), (func)))
PyAPI_FUNC(PyCFunction) PyCFunction_GetFunction(PyObject *);
PyAPI_FUNC(PyObject *) PyCFunction_GetSelf(PyObject *);