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pythoncapi_compat: don't define Py_NULL if it is already defined #18699

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Feb 17, 2025
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pythoncapi_compat: don't define Py_NULL if it is already defined #18699

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2 changes: 2 additions & 0 deletions mypyc/lib-rt/pythoncapi_compat.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ extern "C" {
# define _Py_CAST(type, expr) ((type)(expr))
#endif

#ifndef _Py_NULL
// Static inline functions should use _Py_NULL rather than using directly NULL
// to prevent C++ compiler warnings. On C23 and newer and on C++11 and newer,
// _Py_NULL is defined as nullptr.
Expand All @@ -43,6 +44,7 @@ extern "C" {
#else
# define _Py_NULL NULL
#endif
#endif

// Cast argument to PyObject* type.
#ifndef _PyObject_CAST
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