MAINT: restore npy_PyErr_ChainExceptions

Author: mattip

numpy/_core/include/numpy/npy_3kcompat.h

@@ -245,9 +245,32 @@ npy_PyFile_CloseFile(PyObject *file)
     return 0;
 }
 
+/* This is a copy of _PyErr_ChainExceptions, which
+ *  is no longer exported from Python3.12
+ */
+static inline void
+npy_PyErr_ChainExceptions(PyObject *exc, PyObject *val, PyObject *tb)
+{
+    if (exc == NULL)
+        return;
 
-#define npy_PyErr_ChainExceptions _PyErr_ChainExceptions
-
+    if (PyErr_Occurred()) {
+        PyObject *exc2, *val2, *tb2;
+        PyErr_Fetch(&exc2, &val2, &tb2);
+        PyErr_NormalizeException(&exc, &val, &tb);
+        if (tb != NULL) {
+            PyException_SetTraceback(val, tb);
+            Py_DECREF(tb);
+        }
+        Py_DECREF(exc);
+        PyErr_NormalizeException(&exc2, &val2, &tb2);
+        PyException_SetContext(val2, val);
+        PyErr_Restore(exc2, val2, tb2);
+    }
+    else {
+        PyErr_Restore(exc, val, tb);
+    }
+}
 
 /* This is a copy of _PyErr_ChainExceptions, with:
  *  __cause__ used instead of __context__